Patents Examined by David Lugo
  • Patent number: 8213486
    Abstract: A method for simplifying calculations for pre-whitening in a G-RAKE receiver, comprising receiving at least two signals with at least two antennas via a channel, where each one of said received signals comprises time delayed and attenuated versions of the original signals. Each received signal forms a corresponding vector of received signal versions and the vectors form a matrix of received signals, where, due to correlation between the antennas, the received signals are correlated. Each version also comprises a certain amount of colored noise. The correlating effect of the antennas is estimated and formulated in matrix form and used to acquire essentially uncorrelated received signal vectors in an essentially uncorrelated received signal matrix. A calculated inverse of a covariance matrix of the calculated essentially uncorrelated signal vectors is used to pre-whiten the noise. A G-RAKE receiver arranged for applying the method above.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: July 3, 2012
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventor: Ulf Lindgren
  • Patent number: 8189699
    Abstract: A method for transmitting an ACK/NACK signal and a method for establishing the signal transmission are disclosed. A system for the method determines whether the ACK/NACK signal is repeatedly transmitted or not according to channel environments of a user, and transmits the ACK/NACK signal according to the determined result within a single TTI. Areas unused for transmitting the ACK/NACK signal are allocated for data, resulting in an increased reception reliability of the ACK/NACK signal.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: May 29, 2012
    Assignee: LG Electronics Inc.
    Inventors: In Jae Jung, Bong Hoe Kim, Ki Jun Kim, Dong Youn Seo, Hak Seong Kim, Dae Won Lee, Suk Hyon Yoon, Joon Kui Ahn
  • Patent number: 8160128
    Abstract: Techniques for performing equalization at a receiver are described. In an aspect, equalization is performed by sub-sampling an over-sampled input signal to obtain multiple sub-sampled signals. An over-sampled channel impulse response estimate is derived and sub-sampled to obtain multiple sub-sampled channel impulse response estimates. At least one set of equalizer coefficients is derived based on at least one sub-sampled channel impulse response estimate. At least one sub-sampled signal is filtered with the at least one set of equalizer coefficients to obtain at least one output signal. One sub-sampled signal (e.g., with largest energy) may be selected and equalized based on a set of equalizer coefficients derived from an associated sub-sampled channel impulse response estimate. Alternatively, the multiple sub-sampled signals may be equalized based on multiple sets of equalizer coefficients, which may be derived separately or jointly.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: April 17, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Gokhan Mergen, Parvathanathan Subrahmanya, Nitin Kasturi, Rajesh Sundaresan
  • Patent number: 8135081
    Abstract: The present disclosure presents a predictive signal producing method that effectively levels transmitter output power in a multi-carrier communication system and results in approaching amplifier performance normally associated with constant carrier waveforms. Embodiments of the disclosed solution offers >10 dB reduction in the peak-to-average power required to support the transmission of, for example, orthogonal frequency division modulation (“OFDM”) modulation techniques. Embodiments of the novel system and method maximize peak-to-average power ratio (“PAPR”) reduction with selective mapping and soft clipping, which may include filtering, combined. This novel approach also minimizes overhead, bit error rate, retransmissions, and increases latency as well as implementing processing cycles with a number of iterations.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: March 13, 2012
    Assignee: Harris Corporation
    Inventors: Christopher Douglas Moffatt, Ray J. Kolar, Charles W. Richards
  • Patent number: 8121176
    Abstract: This invention teaches to the details of an interference canceling receiver for canceling intra-cell and inter-cell interference in coded, multiple-access, spread spectrum transmissions that propagate through frequency selective communication channels to a multiplicity of receive antennas. The receiver is designed or adapted through the repeated use of symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be designed, adapted, and implemented explicitly in software or programmed hardware, or implicitly in standard RAKE-based hardware either within the RAKE (i.e., at the finger level) or outside the RAKE (i.e., at the user or subchannel symbol level). Embodiments may be employed in user equipment on the forward link or in a base station on the reverse link. It may be adapted to general signal processing applications where a signal is to be extracted from interference.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: February 21, 2012
    Assignee: Rambus Inc.
    Inventors: Tommy Guess, Michael L. McCloud, Vijay Nagarajan, Gagandeep Singh Lamba
  • Patent number: 8116414
    Abstract: An orthogonal signal from a modulated signal of the digital terrestrial broadcast is produced. Then, an adder carrier-combines the orthogonal signal and an interpolated signal into an interpolated orthogonal signal, which is in turn demodulated by a DQPSK demodulation section. A demodulated signal is produced from a modulated signal of the digital satellite broadcast. A transmission path coding section produces transport stream data. A DQPSK mapping section re-demodulates the transport stream data to produce an orthogonal signal. A sync detection section asynchronously detects a demodulated signal demodulated by the DQPSK demodulation section and a demodulated signal produced by a time deinterleave section in the transmission path coding section. The detected time difference is set as a delay time of a delay circuit so as to delay the orthogonal signal, thereby producing the interpolated signal to be carrier-combined by the adder in order to provide improved reception quality.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: February 14, 2012
    Assignee: Pioneer Corporation
    Inventor: Yutaka Miyahara
  • Patent number: 8111764
    Abstract: There is provided a method for transmitting channel quality information in a wireless communication system. Over-all band of the wireless communication system is divided by a plurality of sub-bands. The method includes selecting a first sub-band having the highest CQI among the plurality of sub-bands, transmitting CQI of the first sub-band and transmitting CQI of a second sub-band, the second sub-band having the CQI lower than the first sub-band, wherein the number of CQI levels of the second sub-band is less than that of CQI levels of the first sub-band. Overheads incurred by CQI feedback can be reduced.
    Type: Grant
    Filed: November 2, 2007
    Date of Patent: February 7, 2012
    Assignee: LG Electronics Inc.
    Inventors: Jin Young Chun, Bin Chul Ihm, Jae Won Chang
  • Patent number: 8111771
    Abstract: A wireless transmitting method includes calculating a beamforming channel matrix which is a channel matrix generated at a time when a transmitting apparatus applies a beamforming matrix to a data signal and transmits the data signal to receiving apparatuses, selecting a parameter to be used while transmitting the data signal based on the beamforming channel matrix and noise information fed back from the receiving apparatuses, and transmitting the data signal by using the selected parameter.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: February 7, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Masaaki Fujii
  • Patent number: 8098710
    Abstract: Techniques for efficiently designing random hopping patterns in a communications system are disclosed. The disclosed embodiments provide for methods and systems for generating random hopping patterns, updating the patterns frequently, generating different patterns for different cells/sectors, and generating patterns of nearby sub-carriers for block hopping.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: January 17, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Palanki, Aamod Khandekar
  • Patent number: 8098719
    Abstract: A method for initializing modems in a multicarrier transmission system to establish a communication link between the transmitter and the receiver. An exemplary embodiment includes the steps of providing a predetermined parameter value that approximates a corresponding actual parameter value of the communication link, establishing a data communication link between a first transceiver and a second transceiver using the predetermined parameter value to allow the transmission of data, determining the actual parameter value, and seamlessly increasing the data rate of the established data communication link by using the determined actual parameter value to provide an steady state communication link with an updated data rate.
    Type: Grant
    Filed: November 10, 2008
    Date of Patent: January 17, 2012
    Assignee: Daphimo Co. B.V., LLC
    Inventor: Marcos C. Tzannes
  • Patent number: 8098711
    Abstract: Techniques for efficiently designing random hopping patterns in a communications system are disclosed. The disclosed embodiments provide for methods and systems for generating random hopping patterns, updating the patterns frequently, generating different patterns for different cells/sectors, and generating patterns of nearby sub-carriers for block hopping.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: January 17, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Ravi Palanki, Aamod Khandekar
  • Patent number: 8098707
    Abstract: An ultra-wideband (UWB) receiver utilizing an Xn(n>1) device as a signal detector for short pulse(s), impulse(s) or ultra-wideband signal(s). The transmitted signal comes to antenna and passes through a band pass filter (BPF). The signal is fed into an Xn device. The output signal from the Xn device is fed into integration/dump block. The output from the integration/dump block is fed into decision block.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: January 17, 2012
    Assignee: Regents of the University of Minnesota
    Inventors: Ramesh Harjani, Byung-Hoo Jung, Mi Kyung Oh
  • Patent number: 8094758
    Abstract: The present invention provides systems and methods for downloading navigation data to a satellite receiver under weak signal conditions. In an embodiment, the receiver uses a tracking algorithm to estimate the Doppler frequency and rate of change of the Doppler frequency to compensate the phases of the I/Q samples from the received signal to reduce the effect of the Doppler frequency. In an embodiment, differential detection based data bit decoding is provided. In another embodiment, phase compensation based data bit decoding is provided, in which the phase of samples are rotated to compensate for phase error. In an embodiment, a multiple frame strategy is provided to increase signal-to-noise ratio (SNR) and improve sensitivity, in which similar placed samples in consecutive frames are coherently summed over the consecutive frames. In an embodiment, the samples are weighted to reduce the impact of noise in the multiple frame strategy.
    Type: Grant
    Filed: December 18, 2006
    Date of Patent: January 10, 2012
    Assignee: SiRF Technology Holdings, Inc.
    Inventors: Chi-Shin Wang, Yue-Meng Chen, Zhike Jia, EnYuan Tu
  • Patent number: 8094762
    Abstract: A radio communication sent by a transmitter having M transmit antennas is received by a receiver having N receive antennas, where M is a positive integer greater than or equal to one and N is positive integer greater than one. Thus, N output signals, one for each receive antenna, are received. The signal transmitted from each transmit antenna includes predetermined pilot symbols known by the receiver and information symbols to be determined by the receiver. Weights for estimating each of M×N single-input/single-output channels between transmit and receive antennas are determined based on jointly processing pilot symbols received on all of the N receive antennas. The M×N channels are estimated based on the determined weights, and those estimated channels are used to determine the information symbols. An iterative procedure is used to estimate the M×N channels using a noise correlation matrix estimate and to estimate the noise correlation matrix using the M×N channel estimates.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: January 10, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Leonid Krasny, Kambiz Zangi
  • Patent number: 8085870
    Abstract: A transmitter suppresses peak power occurring in a transmission signal. The transmitter generates peak suppression signals for suppressing the peak power in the transmission signal respectively, synthesizes the peak suppression signals generated, and subtracts a signal as a synthesis result from the transmission signal.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: December 27, 2011
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Takashi Okada, Jun Watanabe, Takahiro Todate, Norio Hasegawa
  • Patent number: 8077759
    Abstract: A method and an apparatus for new cell identification in a WCDMA network with a given neighbor set are described. Aspects of a system for new cell identification in a WCDMA network with a given neighbor set may include a baseband processor that enables determination of a primary synchronization position and at least one scrambling code based on received configuration information from one or more base stations. The baseband processor may also enable determination of a slot boundary in at least one signal received from the one or more base stations based on the determined primary synchronization position. The system may also include a multipath detector that enables unscrambling of the received at least one signal based on the determined slot boundary and at least a portion of the one or more scrambling codes.
    Type: Grant
    Filed: April 7, 2006
    Date of Patent: December 13, 2011
    Assignee: Broadcom Corporation
    Inventors: Mark Kent, Francis Swarts, Uri Landau
  • Patent number: 8073072
    Abstract: A multiple-input multiple-output (MIMO) system can transmit on multiple antennas simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a legacy 802.11a/g device is not able to decode multiple data streams, such a legacy device may “stomp” on a MIMO packet by transmitting before the transmission of the MIMO packet is complete. Therefore, MIMO systems and methods are provided herein to allow legacy devices to decode the length of a MIMO packet and to restrain from transmitting during that period. These MIMO systems and methods are optimized for efficient transmission of MIMO packets.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: December 6, 2011
    Assignee: Qualcomm Atheros, Inc.
    Inventors: Qinfang Sun, Won-Joon Choi, Jeffrey M. Gilbert, Ardavan Maleki Tehrani
  • Patent number: 8059725
    Abstract: An induction neutralizing transformer is provided. The induction neutralizing transformer includes a core and a coil wrapped around the core. The coil has a length between approximately 100 feet and approximately 200 feet and includes a plurality of twisted wire pairs. The induction neutralizing transformer does not include a screen or shield to prevent crosstalk interference.
    Type: Grant
    Filed: August 27, 2008
    Date of Patent: November 15, 2011
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Russell P. Gundrum
  • Patent number: 8054926
    Abstract: The forward error correction based clock and data recovery system includes a data latch for intermediately storing received data, which is triggered by a sampling clock. The system further includes an error determination unit for determining whether which of the sampled received data is wrong, and for generating out of it a phase/frequency correction signal. Furthermore, the system includes a clock generator for generating the sampling clock depending on the correction signal.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Hayden Clavie Cranford, Jr., Martin L. Schmatz, Thomas H. Toifl
  • Patent number: 8050354
    Abstract: Apparatus, and an associated method, for facilitating communication of a data block communicated in an OFDM-based, communication system. Side-information required to be transmitted by many PAPR reduction schemes in OFDM is carried and transmitted by sending orthogonal binary sequences superimposed on the OFDM data sequence carrying the information to be transmitted. In one embodiment, a selected scrambling sequence is multiplied with an input data block to yield a desired Peak-To-Average Power Ratio. An identification sequence one-to-one corresponding to the scrambling sequence is superimposed on the resultant sequence and transmitted together. In the receiving station, the identification sequence is determined through correlation operations. This also determines the scrambling sequence. The effects of both sequences are finally removed from the information-carrying data sequence.
    Type: Grant
    Filed: December 31, 2010
    Date of Patent: November 1, 2011
    Assignee: Research In Motion Limited
    Inventor: Shouxing Qu