With Output Combining Patents (Class 455/137)
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Patent number: 7236740Abstract: A method and apparatus for retransmitting data in a mobile communication system wherein a receiver determines whether an initial data block received from a transmitter has an error. Upon detecting an error from the initial data block, the receiver estimates a current channel state and determines a retransmission frequency and a power level of the initial data block according to the estimated current channel state. Thereafter, the receiver transmits a retransmission request message of the initial data block together with the determined retransmission frequency and the determined power level to the transmitter. The transmitter retransmits the initial data block as many times as the retransmission frequency at the requested power level. The receiver then determines whether the retransmitted data blocks have errors, and provides the retransmitted data blocks to an upper layer upon failure to detect errors from the retransmitted data blocks.Type: GrantFiled: July 5, 2001Date of Patent: June 26, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Chang-Hoi Koo, Kyou-Woong Kim, Hwan-Joon Kwon
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Patent number: 7231227Abstract: A multi-mode receiver and methods are provided, which use blind source separation (BSS) analysis to distinguish the various wireless communication signals from each other. Specifically, different signal types can be identified by BSS. The different signal types can be in overlapping frequencies or they can be in completely different frequencies. The BSS analysis may use center or carrier frequency, bandwidth, modulation scheme, access scheme, or wireless communication resources as an input to assist in the BSS.Type: GrantFiled: August 30, 2004Date of Patent: June 12, 2007Assignee: Kyocera CorporationInventors: Amit Kalhan, Ramon Khalona, Henry Chang, Doug Dunn, Richard J. Camarillo
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Patent number: 7221925Abstract: Noise and multipath distortions in a broadcast receiver are reduced by an optimal antenna/frequency diversity concept in which the distortions in the audio signal are evaluated to choose a different antenna and/or a different frequency for at least signal parts.Type: GrantFiled: May 13, 2002Date of Patent: May 22, 2007Assignee: Sony Deutschland GmbHInventor: Jens Wildhagen
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Patent number: 7215934Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.Type: GrantFiled: August 28, 2003Date of Patent: May 8, 2007Assignee: Broadcom CorporationInventors: Pieter van Rooyen, Danie van Wyk
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Patent number: 7209663Abstract: A repeating apparatus and method using wireless optical transmission is disclosed. The repeating apparatus includes a donor device for transmitting two identical copies of an optical signal by receiving a RF signal from a base station and electro-optic converting the RF signal to an optical signal, and for transmitting a RF signal by receiving two identical copies of the optical signal and optic-electro converting the optical signal to a RF signal; and a coverage device for transmitting a RF signal to a mobile communication terminal by receiving two identical copies of the optical signal from the donor device and optic-electro converting the two identical copies of the optical signal to the RF signal, and transmitting two optical signals to the donor device by receiving the RF signal from the mobile communication terminal and elector-optic converting the RF signal to the optical signal.Type: GrantFiled: December 22, 2003Date of Patent: April 24, 2007Assignee: Curitel Communications, Inc.Inventor: Jong-Seob Lee
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Patent number: 7190799Abstract: An audio signal processing system for a vehicle is disclosed. The vehicle has a plurality of audio output producing devices. The system includes an audio input circuit, a processor, an audio output circuit, and at lease one speaker. The audio input circuit receives a plurality of audio signals from the plurality audio output producing devices. The processor is in communication with the audio input circuit for combining the plurality of audio signals. The audio output circuit is in communication with the audio input circuit for receiving the combined plurality of audio output signals. The audio output circuit conditions the plurality of audio signals for output. The at least one speaker broadcasts the conditioned plurality of audio signals to a vehicle occupant.Type: GrantFiled: October 18, 2002Date of Patent: March 13, 2007Assignee: Visteon Global Technologies, Inc.Inventors: Thomas J. Bray, Paul Allen Berneis, Borys Joseph Melnyk, Jeff Matson
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Patent number: 7187940Abstract: A decorrelating rake receiver (401) using a signal processor (213) and corresponding method (1000) to determine filter coefficients (1005). The decorrelating rake receiver includes a plurality of filters (219) arranged to be coupled to an input signal (403) and the filter coefficients (409), the plurality of filters operable to provide a plurality of output signals and a coefficient generator (407), coupled to the input signal, to explicitly and definitely determine the filter coefficients for the plurality of filters such that the plurality of filters perform a decorrelating rake process. The decorrelating rake receiver further includes a combiner (221) to combine the plurality of output signals and provide a received signal (405). The decorrelating rake receiver (401) is suitable for use in a wireless communication device (101) or base transceiver (103).Type: GrantFiled: July 31, 2003Date of Patent: March 6, 2007Assignee: Motorola, Inc.Inventor: Brian Todd Kelley
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Patent number: 7164903Abstract: An integrated N-way Wilkinson power divider is described. In one embodiment, the N-way Wilkinson power divider uses a conductor layer with a cross-over (or cross-under) resistor insulated from the conducting layer by an insulating bridge. In one embodiment, the width of the transmission line underneath a cross-over resistor is adjusted to improve performance In one embodiment, a three-way Wilkinson power divider is formed using microstrip transmission lines on a single-layer substrate that supports the microstrip transmission lines, dielectric insulators, and resistors.Type: GrantFiled: June 10, 2003Date of Patent: January 16, 2007Assignee: Smiths Interconnect Microwave Components, Inc.Inventors: Richard Cliff, Michael J. Kettner, Robert J. Wright, Andrew J. Kettner, Patrick A. Biebersmith, Juan G. Ayala
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Patent number: 7162210Abstract: Improvement of interference canceling efficiency and communication system capacity due to the use of the optimal decision function in adaptation of the adaptive antenna array weight factors. An adaptive antenna array pattern forming algorithm is used. The weight vector is determined from the position of the decision function maximum. The proposed decision function is based on estimation of signal to interference plus noise ratio (SINR) at the adaptive antenna array output and is no singular even without noise and interference.Type: GrantFiled: November 27, 2002Date of Patent: January 9, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Alexandr V. Garmonov, Vladimir B. Manelis, Andrew Yu. Savinkov, Igor V. Kayukov, Byung-Jin Chun, Soon-Young Yoon
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Patent number: 7154960Abstract: The per antenna capacity of each of the transmitter antennas in a MIMO system are individually determined from measurable information at the receiver end. Specifically, the channel capacity for each individual transmitter antenna is calculated at the receiver end as a function of measurable channel coefficients (also known as channel state information), the measurable average signal-to-noise ratio, and the number of transmitter antennas. Once the per antenna capacity of each transmitter antenna is individually determined at the receiver end, the maximum transmission rate for each data stream transmitted by each transmitter antenna is determined from that individual capacity either at the receiver end and fed back to the transmitter end, or is determined at the transmitter end from the individual transmitter antenna capacities that are fed back by the receiver end to the transmitter end. A modulation scheme that supports each maximum transmission rate is then determined based on some defined criteria.Type: GrantFiled: December 31, 2002Date of Patent: December 26, 2006Assignee: Lucent Technologies Inc.Inventors: Jung-Tao Liu, Ashok N. Rudrapatna
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Patent number: 7155192Abstract: The present invention is a system for increasing Signal-to-Noise Ratio (SNR) in a wireless communication system comprising a plurality of antennas each antenna providing a signal, a device for selecting a subset of signals provided by the plurality of antennas, a maximum ratio combiner for summing the selected subset of signals provided by the plurality of antennas, and a decision device for measuring the selected subset of signals against a predefined threshold. The device for selecting the subset of signals is coupled to the plurality of antennas. The maximum ratio combiner is coupled to the selected subset of signals and the decision device for measuring the selected subset of signals against a predefined threshold. The decision device is coupled to the selecting device such that one selected signal of the selected subset of signals is replaced by an unused signal provided by the plurality of antennas.Type: GrantFiled: September 25, 2001Date of Patent: December 26, 2006Assignee: AT&T Corp.Inventors: Saeed S. Ghassemzadeh, Richard Henry Erving, Robert Raymond Miller, II, Christopher W. Rice
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Patent number: 7154970Abstract: Input signals of each frame are encoded by mapping the signals onto a coordinate system dictated by the symbols of the previous frame, and symbols from a constellation are selected based on the results of such mapping. Received signals are detected by preprocessing the signals detected at each antenna with signals detected by the antenna at the immediately previous frame, and then applied to a maximum likelihood detector circuit, followed by an inverse mapping circuit.Type: GrantFiled: September 13, 2005Date of Patent: December 26, 2006Assignee: AT&T Corp.Inventors: Hamid Jafarkhani, Vahid Tarokh
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Patent number: 7130657Abstract: Methods and systems are provided for improving frame selection in wireless communications networks. During decoding of a frame, a base station generates an error burst representation associated with error bursts and stores the representation within the frame, thus forming an enhanced frame. The base station then transfers the enhanced frame to a network controller. A frame selection unit (“FSU”) within the network controller thereafter applies frame selection to the enhanced frame. The error burst representation can be analyzed to determine the quality of the enhanced frame. A “combined” frame, generated by combining an “acceptable” portion of the enhanced frame and an acceptable portion of a copy of the enhanced frame, can then be generated to substantially eliminate errors. The present frame selection methods and systems enable superior quality frames to be passed on to higher layers in a network's communications protocol (hereafter collectively referred to as “network”).Type: GrantFiled: October 23, 2000Date of Patent: October 31, 2006Assignee: Lucent Technologies Inc.Inventors: Ashwin Sampath, On-Ching Yue, Qinqing Zhang
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Patent number: 7113548Abstract: An frequency division multiplexing (OFDM) system transceiver for transmitting frequency dividing data in parallel includes antenna elements for receiving known reception and reception data signals. The fast Fourier transforms (FFTs) transform the known reception signals and the reception data signals to obtain known reception sub-carrier signals and reception data sub-carrier signals. The estimator estimates propagation path estimating values of each of the reception data sub-carrier signals with respect to each of the known reception sub-carrier signals. The weight calculator calculates a maximum ratio composition weight to composite the reception data sub-carrier signals. The setting means sets a transmission weight based on the maximum ratio composition weight. The generator generates a transmission data signal by arranging transmission sub-carrier signals on the frequency axis.Type: GrantFiled: June 4, 2002Date of Patent: September 26, 2006Assignee: Denso CorporationInventors: Makoto Tanaka, Kazuoki Matsugatani
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Patent number: 7110444Abstract: Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal generator, a demodulation/modulation facilitation module, and a MAC interface. The WLAN receiver includes at least one universal frequency translation module that frequency down-converts a received EM signal. In embodiments, the UFT based receiver is configured in a multi-phase embodiment to reduce or eliminate re-radiation that is caused by DC offset. The WLAN transmitter includes at least one universal frequency translation module that frequency up-converts a baseband signal in preparation for transmission over the wireless LAN. In embodiments, the UFT based transmitter is configured in a differential and multi-phase embodiment to reduce carrier insertion and spectral growth.Type: GrantFiled: August 4, 2000Date of Patent: September 19, 2006Assignee: ParkerVision, Inc.Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Richard C. Looke, Charley D. Moses, Jr., Gregory S. Rawlins, Michael W. Rawlins
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Patent number: 7110733Abstract: Null detectors 108-1 to 108-3 detect the directions of null points of the respective radiation patterns formed for mobile stations 101-1 to 101-3 and output information indicative of detected null-point directions to notifying section 109, notifying section 109 notifies estimators 110-1 to 110-3 of all null information, and estimators 110-1 to 110-3 estimate the directions where mobile stations that cause interference with the respective stations 101-1 to 101-3 exist, and generate reception weights using null information.Type: GrantFiled: October 19, 2000Date of Patent: September 19, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Takahisa Aoyama
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Patent number: 7107085Abstract: A mobile communication terminal having adaptive array antennas is provided that is capable of transmitting signals to an intended base station without interfering other devices, even when a reception error occurs. The mobile communication terminal basically performs array transmission/reception using weight vectors produced in reception to weight and combine signals received via antennas, and thereby receives a desired signal. In transmission, the mobile communication terminal uses the weight vectors used in reception to weight and combine transmission signals and transmits them. However, when an error detection circuit detects a reception error in the desired signal, a transmission control unit turns off a switch for the antenna and transmits the transmission signals in a non-directional pattern via the antenna, so that the transmission signal reaches the intended base station.Type: GrantFiled: July 13, 2001Date of Patent: September 12, 2006Assignee: Sanyo Electric Co., LtdInventor: Yoshiharu Doi
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Patent number: 7103118Abstract: A combiner for use in a diversity radio receiver (FM) which receives a plurality of diversity I and Q modulated signals each carrying I and Q information signals through spatially separated antennas, the received I and Q signal pairs being digitized at a sampling rate T and converted to baseband I and Q signals. Each converted I and Q signal pair represents a diversity I and Q vector which is input to the combiner. A discriminator is provided for each sample stream of diversity I and Q vectors input to the combiner. Each discriminator produces, for each sample, an output discriminated I and Q vector (I?, Q?) having a phase representative of the frequency of the information signal and an amplitude proportional to the power of the information signal.Type: GrantFiled: November 26, 2001Date of Patent: September 5, 2006Assignee: Dataradio Inc.Inventor: André Beaudin
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Patent number: 7099415Abstract: A receiver which receives broadcast waves from a plurality of broadcasting systems is provided with signal amplifiers that amplify signals received from each of the broadcasting systems. The outputs of the signal amplifiers are superposed to produce a superposed signal. The superposed signal is then demodulated and reception information is reproduced. When the condition of the reception information has deteriorated, at least one of the signals from the signal amplifiers whose signal quality has deteriorated and the signals from the signal amplifiers whose noise level is high are excluded from the superposed signal.Type: GrantFiled: February 8, 2002Date of Patent: August 29, 2006Assignee: Pioneer CorporationInventor: Susumu Ohsawa
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Patent number: 7099644Abstract: A vehicle radio receiver has a beamsteering control system with two signal paths. One signal path generates an audio signal in response to incoming radio signals. Another signal path generates a test signal in response to the incoming radio signals. The audio signal is adjusted in response to the test signal.Type: GrantFiled: December 28, 2001Date of Patent: August 29, 2006Assignee: Visteon Global Technologies, Inc.Inventors: J. William Whikehart, Darby Edward Hadley, John Elliott Whitecar
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Patent number: 7092431Abstract: A receiver, comprising a plurality of antennas configured to receive signals that are obtained by multiplying a plurality of data symbols transmitted over a plurality of data channels using spreading codes for each of the data channels, the data symbol being transmitted over a plurality of sub-carriers having different frequencies; a spreading code multiplier configured to multiply reception signals received by the plurality of antennas using spreading codes for the data channels corresponding to the reception signals; a weight controller configured to adjust antenna weights by which a reception signal received by each antenna is to be multiplied, and sub-carrier weights by which a reception signal received over each sub-carrier is to be multiplied; a weight multiplier configured to multiply the reception signals by the antenna weights and the sub-carrier weights adjusted by the weight controller; and a combining unit configured to combine the reception signals multiplied by the antenna weights and the sub-caType: GrantFiled: December 27, 2002Date of Patent: August 15, 2006Assignee: NTT DoCoMo, Inc.Inventors: Noriyuki Maeda, Hiroyuki Atarashi, Sadayuki Abeta, Mamoru Sawahashi
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Patent number: 7079593Abstract: A measuring unit selects as a representative signal a signal whose received power is the largest among digital received signals in a training signal period, and regards the remaining signals as signals to be processed. Based on a representative notifying signal, a classification unit rearranges the orders of digital received signals after the end of a training signal period. In a synthesizing unit, a multiplier weights the digital received signals with receiving weight vector signals so as to generate multiplication signals which will be summed up in an adder. A receiving weight vector signal computing unit computes receiving weight vector signals by using an adaptive algorithm, over the training signal period of time. After the end of a training signal period, the receiving weight vector signals are updated based on the multiplication signals.Type: GrantFiled: September 24, 2004Date of Patent: July 18, 2006Assignees: Sanyo Electric Co., LTD, NTT Data Sanyo System CorporationInventors: Seigo Nakao, Nobuo Higashida
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Patent number: 7079594Abstract: An antenna selector selects one antenna during an interval of control signal. A receiving weight vector computing unit computes receiving weight vectors. During an interval of data signal, a multiplier in a signal processing unit weights digital received signals with the receiving weight vectors so as to output composite signals. During an interval of control signal, a switch selects an output signal from the antenna selector as an output signal from a signal processing unit whereas during the interval of data signal it selects the composite signal. A carrier control unit outputs carrier recovered by a carrier recovery unit. A multiplier in a modem unit multiplies signal-processing-output-unit signals by signals from the carrier control unit.Type: GrantFiled: December 22, 2004Date of Patent: July 18, 2006Assignees: Sanyo Electric Co., Ltd., NTT Data Sanyo System CorporationInventors: Seigo Nakao, Nobuo Higashida
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Patent number: 7079826Abstract: A first periodic voltage waveform (20) is downconverted into a second periodic voltage waveform (35, 36). A plurality of temporally distinct samples (SA1, SA2, . . . ) respectively indicative of areas under corresponding half-cycles of the first voltage waveform are obtained. The samples are combined to produce the second voltage waveform, and are also manipulated to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform.Type: GrantFiled: March 15, 2002Date of Patent: July 18, 2006Assignee: Texas Instruments IncorporatedInventors: Khurram Muhammad, Dirk L. Leipold, Feng Chen, Kenneth J. Maggio
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Patent number: 7072627Abstract: A first signal component is received having a first signal strength and a second signal component is received having a second signal strength. A difference is identified between the first signal strength and the second signal strength. A determination is made as to whether the difference between the first signal strength and the second signal strength exceeds a threshold. If the difference between the first signal strength and the second signal strength exceeds a threshold, the first signal strength is adjusted to reduce the difference between the first signal strength and the second signal strength.Type: GrantFiled: June 27, 2002Date of Patent: July 4, 2006Assignee: Microsoft CorporationInventor: Louis F. Coffin, III
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Patent number: 7072628Abstract: For determining use of receive diversity in a mobile station, a control system (210 or 401) determines a demand level for use of communication resources. A transmitter (300) communicates a message indicating use of receive diversity at a mobile station based on the determined demand level. In another aspect, a receiver (200) receives a channel and determines transmit power level of the channel for being at a lower or upper transmit power level limit. The control system (210 or 401) controls receive diversity by selecting a number of receiver chains (290) based on the determined transmit power level. In another aspect, receiver (200) receives a channel and determines a channel condition of the channel and duration of the channel condition. Control system (210 or 401) controls receive diversity by selecting a number of receiver chains (290) based on the determined channel condition and the duration.Type: GrantFiled: April 5, 2002Date of Patent: July 4, 2006Assignee: QUALCOMM, IncorporatedInventors: Parag A. Agashe, Peter J. Black, Roberto Padovani
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Patent number: 7054397Abstract: A mobile communication system has a plurality of mobile stations and a base station which includes a plurality of antennas, a frequency shift portion, a combining portion, a receiving portion and a signal processing portion. The antenna receives radio waves transmitted by the mobile stations. The frequency shift portion shifts the received signal with a frequency corresponding to each of the antennas. The combining portion determines the shifted signal as a combining signal. The receiving portion converts the combining signal in frequency to make an intermediate frequency signal, and converts the intermediate frequency signal into a digital signal. The signal processing portion includes spreading demodulation means judging means, and fading compensation means.Type: GrantFiled: February 4, 2000Date of Patent: May 30, 2006Assignee: NEC CorporationInventor: Yoshitaka Kawanabe
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Patent number: 7035671Abstract: A wireless distribution system includes a number of remote units distributed in a coverage area to receive wireless signals and to provide the signals through the distribution system to input ports of an expansion unit where the signals are combined, detectors operatively connected to one or more of the plurality of input ports to determine the presence of information carrying signals at the input ports, a number of selection circuits to select signals in which information has been detected, and a node to combine the selected signals.Type: GrantFiled: April 8, 2002Date of Patent: April 25, 2006Assignee: ADC Telecommunications, Inc.Inventor: Jeffrey Solum
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Patent number: 7031679Abstract: The power of a signal received on a spatial channel in a wireless radio communications system can be estimated. One embodiment of the invention includes receiving a signal at a plurality of antenna elements, the received signal including a first component from a first radio and a second component from a second radio. Then the contribution of the first component to the received signal may be estimated by calculating a first power estimate for the first radio using the received signal, calculating a second power estimate for the second radio using the received signal, and estimating the contribution of the first component to the received signal, the estimation using the first power estimate and the second power estimate. In one embodiment the first power estimate is an SINR of the first component.Type: GrantFiled: March 27, 2002Date of Patent: April 18, 2006Assignee: ArrayComm, LLCInventors: Johan L. Persson, Mitchell D. Trott
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Patent number: 6990137Abstract: Method and apparatus to compute the combiner coefficients for wireless communication systems for a space-time solution. One embodiment trains the weights on a signal known a priori that is time multiplexed with other signals, such as a pilot signal in a High Data Rate, HDR, system, wherein the signal is transmitted at full power. A Minimizing Mean Square Error, MMSE, approach is applied allowing weight combining on a per path basis. The weights are calculated as a function of a noise correlation matrix and spatial signature per path. The noise correlation matrix is determined from an autocorrelation matrix of the received signal. In one embodiment, the MMSE approach is applied to a non-time gated pilot signal.Type: GrantFiled: May 17, 2001Date of Patent: January 24, 2006Assignee: Qualcomm, IncorporatedInventors: John Edward Smee, Nagabhushana Sindhushayana
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Patent number: 6980602Abstract: An apparatus for and method of generating normalized soft decision information output from an inner decoder (i.e. equalizer) in a communications receiver. The invention is operative to normalize the soft decision information before it enters a soft outer decoder. The normalization is performed using a noise power estimate that is dynamically calculated in response to changing noise statistics on the channel. The normalized soft decision output is then applied to the soft outer decoder thus realizing maximum performance therefrom. The noise power estimate is derived from the training sequence and/or the data portion of the received signal. Both types of estimates are calculated. A binary or smoothly weighted average is calculated using both types of estimates. The weighting factor is determined based on one or more performance metrics, such as the Signal to Noise Ratio (SNR).Type: GrantFiled: January 31, 2001Date of Patent: December 27, 2005Assignee: Comsys Communication & Signal Processing Ltd.Inventors: Alexander Kleinerman, Ariel Zaltsman
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Patent number: 6963732Abstract: A first periodic voltage waveform (20) is downconverted into a second periodic voltage waveform (35, 36). A plurality of temporally distinct samples (SA1, SA2, . . . ) respectively indicative of areas under corresponding fractional-cycles of the first voltage waveform are obtained. The samples are combined to produce the second voltage waveform, and are also manipulated to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform. The second waveform is driven by an amplifier stage (25), and the second waveform can be advantageously constructed so as to permit the amplifier stage to perform internal resets, offset corrections and other ancillary amplifier stage adjustments without losing information in the first waveform.Type: GrantFiled: April 25, 2002Date of Patent: November 8, 2005Assignee: Texas Instruments IncorporatedInventors: Khurram Muhammad, Dirk Leipold
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Patent number: 6954614Abstract: A transponder system, which may be on a spacecraft, provides communications to and among user terminals for audio-bandwidth signals. The transponder includes a receiver for uplink signals, and a digital channelizer which separates the various independent uplinked signals. The separated uplinked signals are then grouped together with other signals destined for the same downlink beam, and routed to the corresponding beam input port of a beamformer. The beamformer, in turn, energizes or feeds those antenna elements which are required to form the desired antenna beam. In order to provide a capability for handling signals having a bandwidth greater than that of the audio signals, as might be required for providing the capacity to handle Internet signals, for example, a wideband augmentation equipment (WAE) is coupled in such a manner as to bypass the digital channelizer, to thereby provide a wideband path through the system, bypassing the narrowband channelizer.Type: GrantFiled: December 1, 2000Date of Patent: October 11, 2005Assignee: Lockheed Martin CorporationInventor: Nils Vidar Jespersen
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Patent number: 6947718Abstract: A compensating part compensates for deviations on transmission paths, and a pre-deviation signal combining part or a post-deviation signal combining part combines signals on the transmission paths before or after having the deviations applied thereto, wherein the compensating part performs compensation for the deviations based on output of the pre-deviation signal combining part or post-deviation signal combining part and the signals on the transmission paths to be compensated.Type: GrantFiled: February 6, 2002Date of Patent: September 20, 2005Assignee: Fujitsu LimitedInventor: Shuji Kobayakawa
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Patent number: 6937677Abstract: Original RF carriers are recovered for first and second channels in a diversity receiver and used to de-rotate (demodulate) each of the first and second received signals. The pilot loop filters of each channel are cross coupled to create a joint pilot loop between both channels. The channel with the stronger signal provides a dominant influence on the frequency of the synthesized recovered RF carrier in the channel with the weaker signal. The phase locked pilot loops in both channels will tend to be frequency locked to the frequency of the stronger signal, leaving the respective phase locked pilot loops to make an individual phase adjustment for each channel.Type: GrantFiled: April 9, 2003Date of Patent: August 30, 2005Assignee: ATI Technologies Inc.Inventors: Christopher H Strolle, Anand M Shah, Thomas J Endres, Samir N Hulyalkar, Troy A Schaffer
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Patent number: 6931241Abstract: A communications receiver and a method for receiving and processing information transmitted on either a wide band carrier or a narrow band carrier having In-phase-Quadrature-phase (IQ) modulation, comprising, detecting a portion of the spectrum wide enough to encompass the wide band carrier (BW), converting the wide band carrier to baseband in I and Q components, each component having a bandwidth of BW/2, converting the I and Q components into further I and Q components to form components II, IQ, QI, and QQ of bandwidth equal to BW/4, where each of the sub-bands may contain a portion of the originally transmitted information. Operating in wideband mode, each of the components/is separately processed to extract portions of the originally transmitted information, and operating in a narrowband mode, each of the components containing information is separately processed within the narrow band transmitted carrier to extract portions of the originally transmitted information.Type: GrantFiled: December 21, 2000Date of Patent: August 16, 2005Assignee: Freescale Semiconductor, Inc.Inventors: Nadim Khlat, Stephen Kuffner
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Patent number: 6915465Abstract: A received-signal combining method of transmitting a signal, based on a signal having undergone error-correction coding and transmitted from a radio-transmitting station, to a receiving station from a plurality of radio-receiving stations, and generating a reception-information sequence based on the thus-transmitted signal by the receiving station, comprises the steps of: each radio-receiving station rendering error-correction decoding and error detection processing on the signal transmitted from the radio-transmitting station, and transmitting the error-correction-decoding result to the receiving station when no error is detected by the error detection processing; and the receiving station combining the received error-correction-decoding result according to a first algorithm when receiving the error-correction-decoding result from any radio-receiving station, and, thus, generating the reception-information sequence.Type: GrantFiled: February 22, 2001Date of Patent: July 5, 2005Assignee: NTT DoCoMo, Inc.Inventors: Atsushi Fujiwara, Shinzo Ohkubo, Hirohito Suda
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Patent number: 6901122Abstract: A method includes the steps of receiving (402), by a first receiver (102), a first received signal comprising a first signal (110) and a second signal (120), and receiving (402), by a second receiver (104), a second received signal comprising the first signal (110) and the second signal (120). A branch weight associated with the first receiver (102) and at least one other branch weight associated with the second receiver (104) are determined (406). The branch weight associated with the first receiver (102), the at least one other branch weight associated with the second receiver (102), the first received signal, and the second received signal are combined, forming a combined signal. Channel state information is determined for the combined signal, and the channel state information of the combined signal is restored (412).Type: GrantFiled: March 27, 2001Date of Patent: May 31, 2005Assignee: MotorolaInventors: Nikhil S. Nadgauda, Kevin L. Baum, Frederick W. Vook
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Patent number: 6901062Abstract: The invention provides systems and methods for providing improved wireless data communication. Preferred embodiments of the present invention utilize multiple antenna beams in the forward link to provide increased forward link capacity and/or improved forward link signal quality. Multiple orthogonal sub-pilots are transmitted from a plurality of antenna elements for use in determining forward link channel characteristics according to a preferred embodiment. Forward link channel estimates may then be made by the preferred embodiment subscriber units and provided in a reverse link control channel to the corresponding base station. Multiple beams may also be utilized in the reverse link to provide increased reverse link capacity, such as for use in providing feedback of forward link channel estimates.Type: GrantFiled: November 30, 2000Date of Patent: May 31, 2005Assignee: Kathrein-Werke KGInventors: Shimon B. Scherzer, Piu Bill Wong
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Patent number: 6892058Abstract: N input signals are fed (702) to a first Fourier Transform Matrix (FTM) (208) to produce N intermediate signals. Each of the N intermediate signals is split (704) via a non-isolating splitter (300) to produce M split signals. At least one of the M split signals from each of the N intermediate signals is amplified (706) to produce at least N amplified signals. The at least N amplified signals are coupled (708) to N non-isolating combiners (300), each having at least M input ports, to produce N combiner output signals. The N combiner output signals are applied (710) to a second FTM (210) to produce N final output signals.Type: GrantFiled: March 26, 2003Date of Patent: May 10, 2005Assignee: Motorola, Inc.Inventor: Rodney Wayne Hagen
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Patent number: 6882833Abstract: The present invention, illustrated in various embodiments, provides mechanisms for transferring data in wireless communications systems. In one exemplary embodiment, the data is transferred in an access point (AP) used in a wireless local area network (WLAN), which comprises a wireless communication system connected to a local area network (LAN). The access point includes a baseband chip capable of adapting various radio frequency (RF) units. Each RF unit in turns includes a plurality of RF sub units connected in a daisy-chain manner. Each RF sub unit is also connected to at least one antenna. The access point thus includes a number of antennas that, together with the RF units and the baseband chip, form a smart antenna. In a receiving mode, the data received from the smart antenna travels through the RF sub units in each RF unit, and the data from the RF units travels to the baseband chip.Type: GrantFiled: February 22, 2002Date of Patent: April 19, 2005Assignee: Blue7 CommunicationsInventor: Hung Nguyen
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Patent number: 6873834Abstract: The present invention relate to a wireless communication systems and in particular relates to a wireless diversity scheme. Diversity techniques are well established and known to help in many situations but have generally been considered too complex to implement in a low cost terminal. In accordance with a first aspect of the invention, there is provided a wireless terminal receiver arrangement which has a diverse receiver. Continuous signal assessment and fast switching enables only those signals which contribute to an improvement in the quality of the signal to be switched in.Type: GrantFiled: February 25, 2000Date of Patent: March 29, 2005Assignee: Nortel Networks LimitedInventors: Keith Russell Edwards, John McNicol
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Patent number: 6834179Abstract: In the access control system, a code transmitter-end transceiver unit and a vehicle-end transceiver unit emit signals approximately synchronously on approximately the same carrier frequency. As a result of superimposition, a new code signal arises and its code information item is compared with an expected set point code information item. When there is correspondence, an enable signal for locking or unlocking or releasing the immobilizer is generated. The synchronous transmission/reception makes illegitimate monitoring more difficult.Type: GrantFiled: January 30, 2002Date of Patent: December 21, 2004Assignee: Siemens AktiengesellschaftInventor: Nikolas Bergerhoff
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Publication number: 20040214537Abstract: A cascadable AGC amplifier in a signal distribution system includes a low noise cascadable amplifier having a through path and a cascadable output. The cascadable amplifier is also configured to provide AGC over a predetermined input power range. The cascadable AGC amplifier can be configured to provide gain or attenuation. When the cascadable AGC amplifier is implemented in a signal distribution system, typically as part of a signal distribution device, an input signal can be gain controlled and supplied to multiple signal paths without distortion due to degradation of signal to noise ratio or distortion due to higher order amplifier products. The distributed signal is not significantly degraded by distortion regardless of the number of cascadable AGC amplifiers connected in series or the position of the cascadable AGC amplifier in the signal distribution system.Type: ApplicationFiled: December 11, 2003Publication date: October 28, 2004Inventors: Keith P. Bargroff, Dale Hancock
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Publication number: 20040198452Abstract: An array antenna system comprising an array of antenna elements and a receiver which uses a subset of the signals from the antenna elements, the selection of the subset of signals which should be used for a particular user is made on the basis of measurements of potential performance of the receiver with each subset of signals, combined, rather than of each individual signal.Type: ApplicationFiled: July 30, 2002Publication date: October 7, 2004Inventor: Sebastien Joseph Armand Roy
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Patent number: 6799055Abstract: A RAKE receiver for receiving a spread spectrum signal, the RAKE receiver comprising at least two antennas for receiving a spread spectrum signal containing several user signals, at least one delay unit for delaying the spread spectrum signal received in at least one antenna to prevent the spread spectrum signals received from the different antennas from being cancelled, an adder for combining the spread spectrum signal received in at least two antennas to form a combination signal, and a matched filter for generating a user signal combination impulse response by means of the combination signal.Type: GrantFiled: July 26, 2001Date of Patent: September 28, 2004Assignee: Nokia Networks OyInventor: Marko Heinilä
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Patent number: 6778514Abstract: Method and system for recognizing the presence of a reference signal having M components. A signal s(t) is received that may contain a reference signal s(t;ref). An M×M covariance matrix of the M components of the received signal is formed, and M eigenvector solutions V=Vj and associated eigenvalue solutions &lgr;=&lgr;j (j=1, 2, . . . , M) of the matrix relation R·V=&lgr; V are determined. A subspace S′ of the space spanned, spanned by a selected subset of the vectors Vj′ (j′=1, . . . , N(s)) is formed, with N(s) a selected number that is ≦M. Product signals s(t)·Vj′(t) are formed and integrated over a selected time interval, t0≦t′≦t, to form estimation signals xj′(t) (j′=1, . . . , N(s)). The estimation signal xj′(t) and the reference signal s(t;ref) are used to determine a weighting coefficient wj′(t) (j′=1, . . .Type: GrantFiled: May 31, 2000Date of Patent: August 17, 2004Assignee: Cadence Design Systems, Inc.Inventors: Joseph Boccuzzi, S. Unnikrishna Pillai
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Patent number: 6760572Abstract: Two fixed-phase-related signals of arbitrary (unequal) magnitude are combined without incurring combining loss by use of a signal reflection technique wherein the higher magnitude signal is phase-synchronously reinforced along its path through the combining system. In a specific embodiment, two signal sources are fed as equal phase signals through respective counter-rotating circulators to a four-port first combiner, wherein the first output port of the combiner is provided with a one-eighth wavelength phase delay to a termination and the second output port is directly terminated, so that reflected signals as seen at both input ports return exactly in phase and of equal magnitude to one another. Thereupon the reflected signals are directed by the respective circulators as phase-synchronized signals to a second combiner which combines the phase synchronized signals into a common output signal. The resultant output is the sum of the inputs irrespective of relative magnitudes of the inputs.Type: GrantFiled: April 2, 2002Date of Patent: July 6, 2004Assignee: Tropian, Inc.Inventor: Basim Noori
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Patent number: 6757524Abstract: The present invention relates to a method for applying diversity reception when signals of a mobile station (MS) are received via at least two separate base stations (BTS1, BTS2). A first base station controller (BSC1) is arranged to forward the signals received from a base station (BTS1) to a second base station controller (BSC2), which is arranged to apply diversity combining to forward the received signals further to a mobile switching center (MSC1, MSC2). In connection with handover, the second base station controller (BSC2) is arranged to forward the signals received from a base station (BTS2) to the first base station controller (BSC1); a connection is set up from the first base station controller (BSC1) to the mobile switching center (MSC1, MSC2); and the first base station controller (BSC1) is arranged to apply diversity combining to forward the received signals further to the mobile switching center (MSC1, MSC2).Type: GrantFiled: April 21, 2000Date of Patent: June 29, 2004Assignee: Nokia CorporationInventors: Jari Hartikainen, Mika Jäsberg
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Publication number: 20040087343Abstract: Method of allocating communication codes to channels set up in respect of mobile terminals in communication in a cell of a radiocommunication system, in which the cell is served by a fixed station having means of adjustment of send/receive parameters defining a respective antenna pattern in respect of each mobile terminal in the cell, in which the allocated communication codes form part of a set of codes some at least of which are mutually orthogonal. In response to channel setup or reconfiguration request in respect of a first mobile terminal in the cell, the allocation to the said channel of a code nonorthogonal to at least one code of the set already allocated to another channel set up in respect of a second mobile terminal in the cell is conditionally admitted, as a function of a comparison between the send/receive parameters determined in respect of the first and second terminals.Type: ApplicationFiled: September 3, 2003Publication date: May 6, 2004Applicant: NORTEL NETWORKS LIMITEDInventors: Thierry Lucidarme, Nidham Ben Rached