Signal Strength Patents (Class 455/226.2)
  • Patent number: 7912113
    Abstract: A technique for determining a received signal strength indicator of a target base station at a subscriber station includes performing a discrete Fourier transform on a received signal to provide a transformed signal. In this case, the transformed signal occupies one or more segments of a channel and the one or more segments each include multiple subcarriers. A shift-n cross-correlation is calculated based on the transformed signal and a preamble sequence of the target base station to provide a coarse received signal strength indicator for the target base station.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: March 22, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Krishna Kamal Sayana, Xiangyang Zhuang, Kenneth A. Stewart, Pallav Sudarshan
  • Patent number: 7903726
    Abstract: A signal receiving apparatus includes an indicating unit, a receiving, a system unit which comprises a plurality of electronic components to provide signal processing, a storing unit to store information related to a noise level, and a controlling unit to estimate a signal power level of the data received by the receiving unit, to compare the estimated signal power level of the data with the noise level generated by a power supply to the system unit, and to control the indicating unit to indicate whether the data can be received.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: March 8, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Houk Wang
  • Patent number: 7904042
    Abstract: Fast image rejection. Dual down conversion processing of a received signal by performing both low side injection and high side injection thereby generating a first down converted signal and a second down converted signal. Analysis of one or both of the first and second down converted signals, including the signal and image components thereof, is performed to determine which of the first down converted signal and the second down converted signal is appropriate to be selected for subsequent baseband processing. For example, if a signal strength of an image within the first down converted signal is less than a signal strength of a signal component within the first down converted signal, then the first down converted signal is most likely the appropriate signal to undergo baseband processing. Alternatively, if the converse is true, then the second down converted signal may be the appropriate signal to undergo baseband processing.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: March 8, 2011
    Assignee: Broadcom Corporation
    Inventor: Hooman Darabi
  • Patent number: 7904043
    Abstract: A method for using a “B” channel of a dual channel measurement receiver as a transfer standard for power measurement, which may include in an exemplary embodiment: correlating measurements made with an “A” channel to measurements made with an RF Power Meter on one RF signal source, so that readings from the “A” channel are aligned to the RF Power Meter; aligning the “B” Channel to the “A” Channel (Transfer alignment of Channel B to the RF Power Meter), once the “A” channel has been aligned to read the same as the RF Power Meter; and using the “B” Channel as a transfer standard to measure all remaining RF signal sources in the system, on a time-line much faster than may be accomplished using a power meter.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: March 8, 2011
    Assignee: AAI Corporation
    Inventors: James J. Jaklitsch, Jay Markey, Thomas P. McGrath
  • Publication number: 20110039507
    Abstract: A wireless terminal capable of securing the number of station units capable of simultaneous communication with one unit of access point, reducing power consumption, and ensuring stable communication quality. In the wireless terminal (100), an interference determining section (109) determines whether or not an interference wave is at a predetermined level or more on the basis of the RSSI and SNR of the received signals which are calculated by an RSSI (Received Signal Strength Indicator) calculating section (104) and SNR (Signal to Noise Ratio) calculating section (105) and the presence/absence of a demodulation error notified from a demodulation section (108). A number-of-retransmission upper limit setting section (113) sets the upper limit of the number of retransmission smaller than when the interference wave is at the predetermined level or lower if the interference wave is at the predetermined level or more.
    Type: Application
    Filed: December 8, 2008
    Publication date: February 17, 2011
    Applicant: PANASONIC CORPORATION
    Inventor: Mitsuru Sato
  • Patent number: 7890072
    Abstract: A wireless communication apparatus includes a mechanism for estimating carrier-to-interference (C/I) ratio using a variable bandwidth filter. More particularly, the wireless communication apparatus includes a channel equalization unit coupled to a C/I ratio estimation unit. The channel equalization unit may be configured to calculate instantaneous carrier-to-interference (C/I) ratio values of a received signal. In addition, the C/I ratio estimation unit may be configured to calculate a C/I ratio estimate by filtering successive ones of the instantaneous C/I ratio values. The C/I ratio estimation unit may also be configured to determine whether a transmitter of the signal is transmitting voice data in a voice channel of the signal. The C/I ratio estimation unit may be further configured to inhibit the filtering in response to determining the transmitter of the signal is not transmitting the voice data such as during DTX mode, for example.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: February 15, 2011
    Assignee: Silicon Laboratories, Inc.
    Inventors: Shaojie Chen, Guner Arslan
  • Patent number: 7885318
    Abstract: A method, mobile device, network device, system, and software are devised for soft value scaling with a single antenna interference cancellation (SAIC) receiver, or with an interference rejection combining (IRC) receiver, in an unsynchronized network. A signal is received having interference that is caused by a non-synchronized network. A desired power level of that signal is calculated. Then the desired power is compared to a total power of the signal, in order to identify a portion of a received burst having substantial interference. Then that portion of the received burst is weighted, to reduce its importance during decoding.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: February 8, 2011
    Assignee: Nokia Corporation
    Inventors: Mikko Saily, Olli Piirainen, Kari Niemela, Jari Hulkkonen
  • Publication number: 20110023074
    Abstract: Various embodiments facilitate antenna peaking, such as by assisting a user in configuring the position and/or orientation of an antenna to improve the quality of a received signal. In one embodiment, an antenna peaking system (“APS”) is provided. The APS includes a receiving device, such as a set-top box, and an antenna peaking assistant. The receiving device determines strength of a signal received by an antenna, and transmits information about the determined signal strength to the antenna peaking assistant. The antenna peaking assistant wirelessly receives the transmitted information, and presents an indication of the signal strength. This abstract is provided to comply with rules requiring an abstract, and it is submitted with the intention that it will not be used to interpret or limit the scope or meaning of the claims.
    Type: Application
    Filed: July 24, 2009
    Publication date: January 27, 2011
    Applicant: ECHOSTAR TECHNOLOGIES L.L.C.
    Inventor: Phuc H. Nguyen
  • Patent number: 7877067
    Abstract: Provided is a method for selecting a receiver mode of a mobile terminal having two receivers and that can receive a signal using either or both of the two receivers depending on a channel environment. A method for selecting a receiver mode of a wireless communication terminal having at least two receivers includes computing at least one parameter for determining the receiver mode from a received signal; comparing the at least one parameter with a preset threshold; and selecting one only of a single receiver mode in which either of the two receivers is activated and a dual receiver mode in which both of the receivers are activated according to the comparison result. The method enables a receiver mode to switch between single and dual receiver modes adaptively according to a wireless environment, thus achieving stable signal reception without compromising reception sensitivity.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: January 25, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Bo Seung Hwang, Joo Yong Park, Young Cheol Park
  • Patent number: 7873360
    Abstract: Disclosed are a soft handoff system, a soft handoff method, and a mobile terminal equipped with the soft handoff system. The soft handoff system for a mobile terminal analyzes periodically monitored wireless conditions of neighbor base stations, transmits a PSMM (Pilot Strength Measurement Message) to a current base station when a condition arises that needs reporting to the current base station, receives an HDM (Handoff Direction Message) from the current base station, wherein upon receiving the HDM from the current base station, the system allows a handoff drop timer of an active base station belonging to an active set having a pilot channel signal strength less than a predetermined value to continue running rather than to be reset until the handoff drop timer expires.
    Type: Grant
    Filed: August 4, 2008
    Date of Patent: January 18, 2011
    Assignee: Pantech & Curitel Communications, Inc.
    Inventors: Young-Jin Park, Kyung-Soo Han
  • Patent number: 7873324
    Abstract: Apparatus and method for processing a received pilot to obtain noise estimation of a pilot channel and processing a received first signal channel, separately from a second signal channel that is orthogonal to the first signal channel, to obtain a signal level of the first signal channel. The noise estimation and the signal level are used to calculate a SNR value. Detection on the first channel is done by checking the SNR and the sign of a soft metric.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: January 18, 2011
    Assignee: Broadcom Corporation
    Inventors: Jun Wu, Hongwei Kong, Li Fung Chang
  • Patent number: 7873338
    Abstract: A determination of link quality (CSR) is made from the subscriber station to a relay station. A determination of link quality (CRB) is made from the relay station to the base station, and a determination of link quality (CSB) is made from the subscriber station to the base station. A quality of a first link path from the subscriber station to the base station that passes through the relay station is determined based on at least the link qualities (Csr, Crb). A quality of a second link path from the subscriber station to the base station that does not pass through the relay station is determined based on at least the link quality (Csb). Finally, a determination is made whether to utilize the first link path or the second link path from the subscriber station to the base station based on at least the quality of the first and second link paths.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: January 18, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Eugene Visotsky, Kevin L. Baum, Mark C. Cudak, Philippe J. Sartori
  • Patent number: 7873339
    Abstract: A test method is for determining total isotropic sensitivity (TIS) of a mobile wireless communications device using an RF source controllable to a plurality of source values having a relatively small uncertainty associated therewith. The mobile wireless communications device may includes an antenna and a RF receiver coupled to the antenna and outputting an RSSI value having a relatively large uncertainty associated therewith. The method may include measuring a sensitivity of the RF receiver, and measuring an antenna gain pattern for the antenna based upon controlling the RF source to respective source values causing the RE receiver to generate a same target RSSI value as the RF source and wireless communications device are angularly moved relative to one another to thereby reduce the relatively large uncertainty of the RSSI value. The TIS may be determined based upon the measured sensitivity of the RF receiver and the measured antenna gain pattern.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: January 18, 2011
    Assignee: Research In Motion Limited
    Inventors: Yihong Qi, Michael Certain, Qingmai Zhou, Perry Jarmuszewski
  • Patent number: 7869805
    Abstract: A method and apparatus are provided for allowing a field device to select a data communication provider among a plurality of available data communication providers. Preferably, the method includes periodically, or selectively, assessing the strengths and efficacy of data communication on one or more alternate data communication providers. The data communication provider with the strongest signal and/or most effective data communication is selected for use by the field device. Preferably, the field device logs events where it switches among data communication providers.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: January 11, 2011
    Assignee: Rosemount Inc.
    Inventors: Theodore H. Schnaare, Philip G. Ostby, Gabriel L. Sierra
  • Patent number: 7865160
    Abstract: A wireless communication user terminal having a receiver for receiving a signal having mixed modulation formats, wherein the terminal measures signal power on a portion of the signal received by the terminal, determines a modulation format on the portion of the signal for which the signal power was measured, and modifies the signal power measured based on the modulation format.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: January 4, 2011
    Assignee: Motorola Mobility, Inc.
    Inventors: Charles P. Binzel, William P. DeClerck, Jeffrey C. Smolinski
  • Publication number: 20100330943
    Abstract: In various embodiments, a method for measuring Received Signal Strength Indication is provided. The method may include carrying out a first partial Received Signal Strength Indication measurement for a plurality of mobile radio base stations, selecting at least one mobile radio base station out of the plurality of mobile radio base stations based on the result of the first partial Received Signal Strength Indication measurement for a second partial Received Signal Strength Indication measurement, and carrying out the second partial Received Signal Strength Indication measurement for the selected at least one mobile radio base station.
    Type: Application
    Filed: June 26, 2009
    Publication date: December 30, 2010
    Applicant: INFINEON TECHNOLOGIES AG
    Inventor: Marcus Hoepfner
  • Patent number: 7856215
    Abstract: Aspects of a method and system for signal processing are disclosed and may include receiving a plurality of wireless signals via a plurality of M receive antennas. Each of M phase shifters coupled to each of the M receive antennas may be set to operate in a bypass mode or with an arbitrary phase setting. Corresponding signal strengths of M signals generated when each of the M phase-shifters is coupled to each of the M receive antennas may be measured, while at least a portion of the M receive antennas are turned off. Selecting one of the M generated signals for processing without the use of an antenna switch, based on the measured signal strength. A signal strength of each of the generated M amplified signals may be measured while turning off at least one of the plurality of M receive antennas and without the use of the phase-shifters.
    Type: Grant
    Filed: December 30, 2006
    Date of Patent: December 21, 2010
    Inventors: Arya Behzad, Ali Afsahi, Mark Gonikberg
  • Patent number: 7853226
    Abstract: A peak-hold circuit includes a differential amplifier having first and second transistors as a differential pair, the first transistor receiving an input signal at its gate, a third transistor connected between a first power supply and an output node connecting a gate of the second transistor, connectivity of the third transistor being controlled by the output of the differential amplifier, a capacitor for holding a peak voltage, connected between the output node and a second power supply, a resistor for discharging, which is connected in parallel to the capacitor, and a fourth transistor connected to the first transistor in parallel, the fourth transistor receiving at its gate an a reference voltage for limiting a voltage.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: December 14, 2010
    Assignee: Oki Semiconductor Co., Ltd.
    Inventors: Manabu Hirata, Takashi Taya, Kazuyuki Tajima
  • Publication number: 20100311373
    Abstract: A method and device may be used to produce a received interference value in wireless communications. A wireless transmit/receive unit comprising a radio frequency signal measurement device may be configured to produce a value indicating a radio frequency signal, noise and interference received power. An average noise plus interference measuring device may be configured to produce a value indicating a measured average noise plus interference metric. A received signal to noise indication calculation device may be configured to calculate a received signal to noise indicator from the value indicating a radio frequency signal, noise and interference received power and the value may indicate a measured average noise plus interference metric.
    Type: Application
    Filed: June 14, 2010
    Publication date: December 9, 2010
    Applicant: INTERDIGITAL COMMUNICATIONS CORPORATION
    Inventor: Joseph A. Kwak
  • Publication number: 20100291892
    Abstract: A method for obtaining field strength information from a received electromagnetic signal by a receiver unit is provided, whereby an input voltage for an operational amplifier is generated from the received signal in the receiver unit by means of an input resistance realized as a voltage divider circuit and an output voltage is generated by the operational amplifier by means of a fixed amplification factor. The input voltage is changed until the output voltage lies within a predefined interval that includes the value of the reference voltage. The input voltage is tapped at the voltage divider circuit and, to change the input voltage at the voltage divider circuit, which has a plurality of divider nodes and a constant resistance value, a divider node is selected and a partial voltage is tapped. The field strength value received by the receiver unit is determined from a comparison of a quantity assigned to the selected divider node.
    Type: Application
    Filed: May 12, 2010
    Publication date: November 18, 2010
    Inventors: Daniel MOSER, Thomas Saile
  • Publication number: 20100279639
    Abstract: A low power rf control system includes a controller that operates at a low clock speed when an associated rf receiver is deenergized and a high clock speed when the controller energizes the receiver. The receiver can be on for a short period, off for a short period when no preamble pulses from a remote control device are received, on for a short period, and then off for a longer period until the next cycle. The receiver remains on to process a command signal when a preamble signal is detected. A DC-DC down converter can be used as a power supply for the receiver, and a SAW resonant circuit can be used as an IF oscillator for the receiver. An LC filter can be associated with the receiver for filtering the IF signal.
    Type: Application
    Filed: July 9, 2010
    Publication date: November 4, 2010
    Applicant: Somfy SAS
    Inventors: Winston Glenn WALKER, David A. SAAR
  • Patent number: 7821938
    Abstract: A method for communication includes accepting input data from two or more data sources, one or more of which include continuous synchronous tributaries, for transmission over a wireless communication link having a variable data rate. Relative priorities are assigned to the respective data sources. A currently-available data rate of the communication link is determined. The input data accepted from the data sources is multiplexed to produce a composite data stream. The input data of at least one of the tributaries is selectively omitted from the composite data stream based on the respective relative priorities, in order to match the data rate of the composite data stream to the currently-available data rate of the communication link. The composite data stream is transmitted over the communication link.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: October 26, 2010
    Assignee: Provigent Ltd.
    Inventors: Jonathan Friedman, Ran Soffer
  • Publication number: 20100265924
    Abstract: A system and method for performing a beamforming training between heterogeneous wireless devices in a wireless network is disclosed. A number of time slots in a fixed-time period are assigned for transmit and/or receive sector training. The number of time slots assigned for transmit and/or receive sector training is based on an antenna configuration of a wireless station.
    Type: Application
    Filed: March 12, 2010
    Publication date: October 21, 2010
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Su Khiong Yong, Julan Hsu, Harkirat Singh, Chiu Ngo
  • Patent number: 7805112
    Abstract: A wireless communication system with power regulation feedback for improving the robustness of wireless communication transmissions between a receiver and an active emitter irrespective of the distance separation therebetween. The receiver receives wireless communications and detects a voltage induced therein. A feedback loop provides wireless transmission of power regulation feedback based on the detected voltage. The active emitter generates a power regulated data signal in which at least one of maximum and minimum bit voltage levels of respective logical high and low bits is adjusted based on the induced voltage received via the feedback loop. The RF power level, modulation index, and/or slew rate of a data signal emitted from the active emitter is regulated by adjusting at least one of maximum and minimum bit voltage levels of respective logical high and low bits based on voltage induced in the receiver during a previous communication from the active emitter.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: September 28, 2010
    Assignee: Codman Neuro Sciences Sárl
    Inventors: Alec Ginggen, Rocco Crivelli
  • Patent number: 7801490
    Abstract: Disclosed are systems and methods which implement communication scheduling to reduce service level variance associated with interference. In providing communication scheduling according to embodiments, mult-channel coverage may be provided throughout all portions of a service area to facilitate resource flexibility. According to embodiments, interference metrics are collected in real time for use in scheduling decisions. Synchronized point to multipoint wireless network protocols may be used to facilitate interference metric collection and/or communication scheduling. Uplink and/or downlink communications may be scheduled using one or more diversity attribute in order to achieve a desired level of bandwidth throughput, communication service level variance, and/or communication reliability in spite of the presence of unpredictable interference in the spectrum.
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: September 21, 2010
    Assignee: Hewlett-Packard Company
    Inventor: Shimon B. Scherzer
  • Patent number: 7801311
    Abstract: A stereo decoder includes a first digital filter for producing a first filtered composite audio signal and a second digital filter for producing a second filtered composite audio signal. A sum/difference network produces a left channel signal and a right channel signal. A processor executes operational instructions that calculate a first corner frequency of a first digital filter based on a signal quality of the FM signal, calculate a first set of filter coefficients for the first digital filter based on the first corner frequency and an approximation of a filter transform, calculate a second corner frequency of a second digital filter based on the signal quality, and calculate a second set of filter coefficients for the second digital filter, based on the second corner frequency and the approximation of the filter transform.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: September 21, 2010
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Jon David Hendrix, Thomas Glen Ragan
  • Patent number: 7796962
    Abstract: A digital demodulating apparatus includes a tuner that selectively receives one of frequency bands, and a demodulator that demodulates a signal from the tuner.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: September 14, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takae Sakai, Nobuyoshi Kaiki
  • Patent number: 7796965
    Abstract: Method and Circuit Arrangement for Field Strength Determination and Integrated Circuit is provided. In the method of the invention for determining the field strength of a carrier signal at an antenna of an antenna circuit of an electronic key, whereby the antenna circuit generates an output value, which is a function of the field strength and a function of characteristic parameters of the antenna circuit, comprises the steps: generation of a reference input value, supplying the antenna circuit with the reference input value, measurement of the characteristic parameters, while the antenna circuit is supplied with the reference input value, storage of the characteristic parameters, measurement of a first output value of the antenna circuit, and determination of the field strength from the first output value and the characteristic parameters, whereby an effect of the characteristic parameters on the field strength is compensated. Use, for example, in motor vehicles.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: September 14, 2010
    Assignee: Atmel Automotive GmbH
    Inventors: Daniel Moser, Helmut Moser
  • Patent number: 7787845
    Abstract: The method and apparatus described herein uses variable length snapshot periods to determine signal strength measurements. A mobile station determines the measurement bandwidth associated with a base station, and sets the snapshot period based on the measurement bandwidth. The mobile station determines the signal strength of serving and neighboring cells during snapshot periods. Such signal strength measurements may be used to assist and/or direct handover operations.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: August 31, 2010
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Bengt Lindoff, Elias Jonsson
  • Patent number: 7783312
    Abstract: Systems and methods for improving the performance of wireless telecommunications networks by reducing data communications between a mobile station and a base station. One embodiment of the invention is implemented in an IS2000 (cdma2000) network. This network communicates data from a base station to a mobile station over a supplemental forward channel. In order to maintain the best communication channel for data transmissions, the mobile station monitors the signals received from an active set of base stations and identifies the strongest signal of a reduced active set so that the corresponding base station can be selected for data communications. Upon the occurrence of conditions indicating that a new base station within the reduced active set should be selected, the mobile station provides a notification to the base stations in the reduced active set so that further data transmissions will be made by the newly selected base station.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: August 24, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Ravishanker Mudigonda, Syed Nadeem Ahsan
  • Publication number: 20100210231
    Abstract: A compensation method for radio frequency module performance, said radio frequency module is provided with a radio frequency input power detection circuit, a radio frequency output power detection circuit, a module monitoring circuit, a power amplification circuit and a radio frequency digital controlled attenuator. The soft program running in the processor of the module monitoring circuit adjusts parameters of the radio frequency module according to querying predefined compensation table or according to the compensation data calculated based on predefined formula/algorithm, thus reducing influence of ambient temperature to linearity, gain, radio frequency power detection accuracy of the radio frequency module, as well as avoiding gain decrease of the radio frequency module. Moreover, a radio frequency module improved by such method is also provided.
    Type: Application
    Filed: July 1, 2008
    Publication date: August 19, 2010
    Applicant: SHENZHEN GRENTECH CO., LTD.
    Inventors: Chengsheng Li, Yali Wang, Limeng Xiao
  • Patent number: 7778617
    Abstract: In an embodiment, a receiver for processing a RF input signal having a variable signal strength includes an RF amplifier, an IF amplifier, and a controller. The RF amplifier is configured to receive and amplify the RF input signal. The IF amplifier is coupled to an output of the RF amplifier. The controller controls gains of the RF amplifier and the IF amplifier during times of falling signal strength. A gain of the IF amplifier is increased as the signal strength falls until a first amplitude threshold is reached for the falling signal strength. If the signal strength falls beyond the first threshold, a gain of the RF amplifier is increased until a second amplitude threshold is reached. The second amplitude threshold is lower than the first amplitude threshold. If the signal strength falls below the second amplitude threshold, the gain of the IF amplifier is further increased.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: August 17, 2010
    Assignee: Broadcom Corporation
    Inventors: Ramon Alejandro Gomez, Stephen Krafft, Tommy Yu
  • Patent number: 7778615
    Abstract: An indicator of a strength of a signal comprising a training sequence portion received in a radio propagation environment is provided. Samples are taken from the training sequence portion, an energy value of the samples over an estimated channel impulse response is computed and the indicator of the strength of the signal is estimated from the energy value.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: August 17, 2010
    Assignee: Nokia Corporation
    Inventors: Mikko Saily, Olli Piirainen, Kari Niemela, Jari Hulkkonen
  • Patent number: 7773950
    Abstract: A receiver circuit suppresses effects of “benign” impairment from the calculation of received signal quality estimates, such that the estimate depends primarily on the effects of non-benign impairment. For example, a received signal may be subject to same-cell and other-cell interference plus noise, which is generally modeled using a Gaussian distribution, and also may be due to certain forms of self-interference, such as quadrature phase interference arising from imperfect derotation of the pilot samples used to generate channel estimates for the received signal. Such interference generally takes on a distribution defined by the pilot signal modulation, e.g., a binomial distribution for binary phase shift keying modulation. Interference arising from such sources is relatively “benign” as compared to Gaussian interference and thus should be suppressed or otherwise discounted in signal quality calculations.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: August 10, 2010
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Yi-Pin Eric Wang, Gregory E. Bottomley, Rajaram Ramesh
  • Patent number: 7773964
    Abstract: Systems, methods, apparatus, processors and computer-readable media include a radiated testing module that executes a predetermined radiated performance test on a wireless device. The test dictates various performance-related parameters to measure and log at each of a plurality of predetermined positions. Further, the wireless device receives synchronization information operable to enable synchronization between the logged measurements and each of the positions. The synchronized log allows the wireless device, or another apparatus, to determine a radiated performance characteristic based on a predetermined analysis protocol. Further, the described embodiments allow for the determination of several radiated performance characteristics in a single test, using a single, unaltered wireless device.
    Type: Grant
    Filed: October 24, 2005
    Date of Patent: August 10, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Ernest T. Ozaki, Kenny Fok, Paul M. Seckendorf, Tia Manning Cassett, Patrick Tierney, Gregory Alan Breit, Jing Li
  • Publication number: 20100197260
    Abstract: Two versions of the auto-covariance matrix of a received signal are obtained. One version is dependent upon the fraction of the power of a transmission site that goes into the wanted signals and a value is sought for this fraction that produces a good match between the two versions.
    Type: Application
    Filed: February 5, 2009
    Publication date: August 5, 2010
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventor: David F. Chappaz
  • Patent number: 7764930
    Abstract: In a data transmission system, a transmitter adds control data to transmission data, and modulates the resultant signal by a predetermined modulation method, and sends the result in a wireless manner. A receiver detects a reception power intensity by use of the control data contained in the transmitted signal. A random pattern is used for a reception-power detecting portion for detecting a reception power intensity, which is contained in the control data.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: July 27, 2010
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Akinori Taira, Fumio Ishizu, Keishi Murakami
  • Patent number: 7761071
    Abstract: In order to provide a variable gain amplifier of enhanced linearity and wide variable gain range, an AM-modulated signal reception circuit in which the noise of an input portion is reduced so as to improve the follow-up characteristic of an AGC circuit, and an AM-modulated signal detection circuit which produces an output precisely corresponding to a peak value envelope, the variable gain amplifier comprises a differential input amplifier which includes transistors T1 and T2 (in FIG. 8) constituting a differential pair, and a constant current circuit Is operating as an absorption current circuit of the transistors T1 and T2, and a variable impedance which is connected between the sources of the respective transistors T1 and T2, wherein the gain of the differential input amplifier is made variable by variably controlling the value of the variable impedance.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: July 20, 2010
    Assignee: Oki Semiconductor Co., Ltd.
    Inventors: Tokio Miyasita, Junichi Yanagihara, Takashi Taya
  • Patent number: 7761119
    Abstract: A system and method for indicating signal strength of a multi-mode wireless communication device is disclosed. The wireless communications device simultaneously displays signal strength indicators of multiple radio access technologies on the multi-mode wireless communication device. In an exemplary method, the multi-mode wireless device determines a first signal strength of a first radio access technology and displays the signal strength in a designated annunciator area of a display of the device. The device then determines availability and signal strength for a second radio access technology and further displays a second signal strength indicator in the annunciator area corresponding to the second determined signal strength of the second radio access technology.
    Type: Grant
    Filed: July 5, 2006
    Date of Patent: July 20, 2010
    Assignee: Kyocera Corporation
    Inventor: Mehul B. Patel
  • Patent number: 7756480
    Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a signal being received by the wireless device. A portion of the signal from the transmit chain is diverted into cancellation circuitry coupled to the receive chain prior to a location in the transmit chain where leak-over occurs, and an amplitude and phase of the portion is manipulated. The manipulated portion is combined with the received signal and other portion to at least partially cancel interference caused by the portion leaking over into the receive chain.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: July 13, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Lup Meng Loh
  • Publication number: 20100171592
    Abstract: A determining apparatus ensures an assurance value of reliability in the determination result for determining the correct tag. A signal receiving unit 121 receives a signal transmitted by the tag (the communication apparatus), a plurality of times. An identification acquiring unit 122 acquires identification data of the tag based on the received signal. The reception counting unit 123 counts a number of reception times the signal is received for each tag. The apparatus determining unit 132 determines that the tag having the more number of reception times as the correct tag (the communication partner) when the difference in the number of reception times is greater than or equal to the times difference threshold.
    Type: Application
    Filed: June 26, 2009
    Publication date: July 8, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Toshihisa Kamemaru
  • Publication number: 20100167676
    Abstract: A filtering apparatus and method using a reference feedback circuit is disclosed. The filtering apparatus includes an input signal generating unit, a reference feedback unit, and a band-pass filter. The input signal generating unit generates an input signal in an allocated band that the receiver uses. The reference feedback unit compares the power of the input signal with that of an output signal and generates a reference signal. The output signal is generated as a band-pass filter filters the input signal with respect to the allocated band. The band-pass filter adjusts the quality factor (Q factor) of a receiver according to the reference signal and passes frequencies of the input signal input to the receiver only within the allocated band.
    Type: Application
    Filed: December 29, 2009
    Publication date: July 1, 2010
    Inventors: Hangue PARK, WonSuk Choi, JongWook Zeong
  • Publication number: 20100167675
    Abstract: The present invention relates to a communication transmission field, and particularly provides a device, a method, and a system for aligning an antenna. The method includes steps as follows. An input signal is received, and a receiver signal strength indication (RSSI) value is output according to a strength of the input signal. The RSSI value is received, and a practically received power value corresponding to the input signal is acquired by looking up a corresponding table between the RSSI and power. An antenna rotation signal and an alignment indication signal are output. The antenna is adjusted according to the antenna rotation signal so as to change a receiving angle of the antenna. Then, it is displayed that the antenna is aligned according to the alignment indication signal. In the present invention, the man-made operation errors are reduced, thus the network quality is effectively ensured.
    Type: Application
    Filed: June 29, 2009
    Publication date: July 1, 2010
    Applicant: Huawei Technologies Co., Ltd.
    Inventor: Guixue Zhao
  • Patent number: 7747223
    Abstract: The described embodiments relate generally to methods, systems and computing devices, including at least a mobile device, for ordering a discovered device list according to a Received Signal Strength Indication (RSSI) of each device in the discovered device list. Thus, the discovered device list has at the top of the list the device that has the highest RSSI, with the remaining devices in the discovered device list presented in descending order of RSSI.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: June 29, 2010
    Assignee: Research In Motion Limited
    Inventors: Sean Elliott Wilson, Christopher Pattenden
  • Publication number: 20100151807
    Abstract: A signal quality estimator for estimating the quality of signal reception in a signal receiver, the signal quality estimator comprising: a first filter for filtering a signal received by the receiver to isolate a frequency band therein; and a signal analyzer for forming an indication of the degree to which the amplitude of the signal in that frequency band varies over time, to serve as an estimate of the quality of signal reception in the receiver.
    Type: Application
    Filed: November 29, 2007
    Publication date: June 17, 2010
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventor: Andrei Barbu Popescu
  • Publication number: 20100144295
    Abstract: A method of tuning an antenna circuit includes: (a) receiving a signal on an antenna, (b) producing a received signal strength indication based on the received signal, (c) using the received signal strength indication to produce a control voltage, (d) using the control voltage to control a capacitance in an antenna matching circuit, (e) changing the control voltage to minimize a ratio of a change in the received signal strength indication to a change in the control voltage and (f) repeating steps (a), (b), (c), (d) and (e). An apparatus that implements the method is also provided.
    Type: Application
    Filed: December 10, 2008
    Publication date: June 10, 2010
    Applicant: iBiquity Digital Corporation
    Inventors: Brian William Kroeger, Paul James Peyla, Jeremy Daniel Gotwalt, Libin Wang, Dean Anthony Telson
  • Publication number: 20100144297
    Abstract: A communication device and a communication method capable of implementing high-speed and high-quality communication processing such as handover. A mobile communication terminal is configured such that, in cases where it is judged by a power measurement unit that a reception signal received by a communication unit is equal to or less than a predetermined value, a frequency conversion unit performs computation by expanding a frequency range for performing time/frequency conversion with respect to the received reception signal. Further, a frequency measurement unit measures reception strength of reception signals in the expanded frequency range, and detects a frequency of, among the measured signals, a signal with a reception strength higher than a predetermined reception strength, and the communication unit executes connection processing by using the signal of this frequency.
    Type: Application
    Filed: March 26, 2008
    Publication date: June 10, 2010
    Applicant: NTT DoCoMo Inc.
    Inventors: Hidetoshi Suzuki, Takashi Okada, Shinsuke Ogawa, Masayuki Furusawa
  • Publication number: 20100136938
    Abstract: A method for using a “B” channel of a dual channel measurement receiver as a transfer standard for power measurement, which may include in an exemplary embodiment: correlating measurements made with an “A” channel to measurements made with an RF Power Meter on one RF signal source, so that readings from the “A” channel are aligned to the RF Power Meter; aligning the “B” Channel to the “A” Channel (Transfer alignment of Channel B to the RF Power Meter), once the “A” channel has been aligned to read the same as the RF Power Meter; and using the “B” Channel as a transfer standard to measure all remaining RF signal sources in the system, on a time-line much faster than may be accomplished using a power meter.
    Type: Application
    Filed: February 4, 2010
    Publication date: June 3, 2010
    Applicant: AAI Corporation
    Inventors: James JAKLITSCH, Jay MARKEY, Thomas P. McGRATH
  • Patent number: 7729677
    Abstract: The invention relates to the field of wireless communications, more particularly to a method of and device for switching between antennae in communication with a diversity receiver, each of the antennae receiving signals transmitted from a single source. A packet from a transmitter is received by respective antenna communicating with a diversity receiver. The signal strength of the preamble of the packet received in a first antenna is sampled. If the signal strength is of sufficient magnitude to affect reliable reception, the associated antenna is selected for the duration of the packet transmission. If the signal strength is below a predetermined threshold the signal strength of the preamble of the packet received in a second antenna is sampled and compared to the sample associated with the first antenna. If the magnitude of the second sample is greater, the signal associated with the second antenna is selected.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: June 1, 2010
    Inventors: Aryan Saed, Phil Guillemette
  • Publication number: 20100130152
    Abstract: A signal processing system and methods for controlling a bandwidth of the signal processing system are disclosed. One method includes the steps of detecting a presence of an adjacent signal on at one adjacent channel relative to a desired channel, detecting a modulation characteristic of the desired channel, measuring a signal strength on the at least one adjacent channel, measuring a signal strength on the desired channel, and adjusting a bandwidth filter applied to the desired channel in response to the measurements and detection steps.
    Type: Application
    Filed: November 26, 2008
    Publication date: May 27, 2010
    Inventors: J. William Whikehart, Robert Kelly Cadena