Patents Examined by Mohammad H. Ghayour
  • Patent number: 7860148
    Abstract: A receiving circuit which receives information using a multi-carrier signal comprises a phase rotation amount calculator which calculates a phase rotation amount of a multi-carrier signal included in a first frequency band according to a pilot-sub carrier included in the first frequency band, a converter which calculates a phase rotation amount of a multi-carrier signal included in a second frequency band according to the phase rotation amount of the multi carrier signal included in the first frequency band.
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: December 28, 2010
    Assignee: NEC Electronics Corporation
    Inventor: Takahiro Sato
  • Patent number: 7856072
    Abstract: An object of the present invention is to reduce jitter dependent on data patterns by an interface receiver. Another object of the present invention is to provide an LSI capable of automatically adjusting a delay time for jitter reduction so as to be able to control its setting for each device. Since the jitter dependent on the data patterns can be expected according to how the previous state is being placed, the state of data received by the receiver is held, and the timing provided to fetch input data is adjusted according to the held state and the input data. As a control mechanism lying in the receiver, for determining a delay time dependent on the form of mounting, a driver transmits and receives pulse data set at one-cycle intervals and pulse data set at two-cycle intervals as test patterns. The receiver has an automatic control mechanism for determining a delay time optimal to a system from the difference between a rising time of each of pulses different in pulse width and its falling time.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: December 21, 2010
    Assignee: Elpida Memory, Inc.
    Inventors: Hideki Osaka, Yoji Nishio, Seiji Funaba, Kazuyoshi Shoji
  • Patent number: 7852912
    Abstract: A direct determination equalizer system (“DDES”) for compensating for the deterministic effects of a transmission channel and a data source is disclosed. The DDES may include an equalizer having equalizer-tap coefficients, a cross-correlator configured to receive the first sampled signal and an ideal signal and in response produce a cross-correlated signal, and a processor in signal communication with the equalizer and the cross-correlator. The equalizer is configured to receive a first sampled signal and in response produce an equalized output data signal sequence and the processor is configured to determine the equalizer-tap coefficients from the cross-correlated signal.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: December 14, 2010
    Assignee: Agilent Technologies, Inc.
    Inventors: Mark J. Woodward, Marlin E. Viss
  • Patent number: 7852907
    Abstract: A correlator (30) for performing a correlation with a received spread spectrum signal, comprising at least an input (30.1) for inputting samples of a received signal; at least one reference code input (30.2) for inputting at least one reference code, a correlator block comprising a data shift register (36) for receiving the signal samples; a number of register groups (31) comprising a code shift register (33) for receiving at least a part of at least one reference code; and a code register (34) for receiving data from the code shift register (33); configuration pathways (201, 202, 203) for arranging the connections between the code shift register and code register (33, 34) of the register groups (31) in a reconfigurable manner.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: December 14, 2010
    Assignee: Nokia Corporation
    Inventor: Ville Eerola
  • Patent number: 7848403
    Abstract: A technique for enhanced reconditioning equalizer filter chain for multi-carrier signals is described. The input to a transmitter chain is modified by an enhanced reconditioning equalizer filter chain, prior to being applied to the transmitter. The enhanced reconditioning equalizer filter chain modifies and smoothen the amplitude of the signal. The modified and smoothen signal has its picks reduced which results to lower Crest Factor. The input to the enhanced reconditioning equalizer filter chain could be a baseband, an intermediate frequency (IF) or radio frequency (RF) signal. When the signal is an IF or RF signal it needs to be down converted to baseband before applied to enhanced reconditioning equalizer filter chain. The enhanced reconditioning equalizer filter chain could be implemented in digital or analog domain.
    Type: Grant
    Filed: November 24, 2006
    Date of Patent: December 7, 2010
    Assignee: Kiomars Anvari
    Inventor: Kiomars Anvari
  • Patent number: 7848387
    Abstract: A parametric form of G-Rake and chip equalization for closed-loop transmit diversity is provided, that accounts for impairment correlation between transmit antennas. In a closed-loop transmit diversity system, the base station transmits a signal from two or more antennas, using one of a predetermined set of relative phase offsets at one of the antennas. The parametric estimation of the impairment or data covariance is performed by summing terms, including a term for each possible phase offset. The terms are weighted by fitting parameters. The fitting parameters are jointly solved by fitting the impairment or data covariance estimate to a measured impairment or data covariance. In another aspect, a measured impairment covariance is formed by exploiting a special relationship between the pilot channels of the different transmit antennas.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: December 7, 2010
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Elias Jonsson, Yi-Pin Eric Wang, Gregory E. Bottomley, Stephen J. Grant
  • Patent number: 7843992
    Abstract: In one embodiment, a circuit is provided that includes: an impulse generator operable to provide a pulse train; a pulse position modulator having a splitting junction configured to receive the pulse train, the pulse position modulator including a plurality of n transmission lines, wherein n is an integer, the n transmission lines being selectably coupled in parallel between the splitting junction and a combining junction, the impulse generator driving each transmission line having a unique delay such that if the transmission line is selected, each pulse received at the splitting junction is uniquely delayed into a delayed pulse, whereby if all the transmission lines are selected, each pulse received at the splitting junction is uniquely delayed into a corresponding plurality of n delayed pulses; and a controller operable to select the transmission lines responsive to received words of n bits in length, each word arranged from a first bit to an nth bit, and wherein the transmission lines are arranged from a fi
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: November 30, 2010
    Inventor: Farrokh Mohamadi
  • Patent number: 7844018
    Abstract: An OFDM telecommunications system includes a transmitter and a receiver. The receiver includes a canceller configured to reduce inter-carrier interference (ICI) in an OFDM symbol in the frequency domain.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: November 30, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Tao Tian, Raghuraman Krishnamoorthi, Krishna Kiran Mukkavilli, Fuyun Ling
  • Patent number: 7844011
    Abstract: An apparatus and method for improving a symbol error rate of an M-ary phase shift keying (M-PSK) system having a quadrature error are provided. The apparatus includes: a conversion parameter detector that detects a conversion parameter and converts a symbol decision region using the quadrature error and at least one pair of first received symbols; and a converter & determiner converting a pair of second received symbols using the detected conversion parameter, and determining a transmission symbol according to a symbol of the converted pair of second received symbols. An increase in a symbol error rate due to the quadrature error can be prevented and the quadrature error can be easily estimated.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: November 30, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Keun Park, Jin A Park, Pyung Dong Cho, Hyeong Ho Lee
  • Patent number: 7839940
    Abstract: A first data symbol that includes a kth data bit is received over a multicarrier system. A first channel quality parameter is estimated for the first data symbol. A second data symbol that includes a retransmitted kth data bit is received. A second channel quality parameter for the second data symbol is estimated. A probable value of the kth data bit is determined based on both the first channel quality parameter and the second channel quality parameter. In response to an ARQ for data symbols communicated over a multicarrier system, the following are performed: determining channel quality parameters, each of the channel quality parameters corresponding to at least one of the transmitted data symbols; selecting a subset of the channel quality parameters exhibiting a worst quality; constructing a block of data symbols corresponding to the subset; and communicating the block of data symbols over a plurality of subcarriers.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: November 23, 2010
    Assignee: Nokia Corporation
    Inventors: Mohammad Jaber Borran, Behnaam Aazhang, Prabodh Varshney
  • Patent number: 7839918
    Abstract: In a method for estimating a frequency deviation between a received spread-spectrum code signal and a local frequency signal, the received spread-spectrum code signal is despread using a local spread-spectrum code. The despread signal is integrated over a particular integration period. From at least two successively obtained integration values, a phase change value characteristic of the phase change between the two integration values is calculated. From this, the frequency deviation is determined.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: November 23, 2010
    Assignee: Infineon Technologies AG
    Inventors: Andreas Schmid, André Neubauer
  • Patent number: 7835465
    Abstract: A simplified architecture is disclosed for use in wireless receiver applications, particularly for ADC conversion of received in-phase I and quadrature Q signals. Circuit area is substantially reduced by sharing a single ADC to convert both signals, switching the ADC input alternately between the i and q signals. In an embodiment, the ADC is clocked at an increased sample rate, and the digital output signals are aligned to compensate for the phase difference resulting from the implementation of a single ADC.
    Type: Grant
    Filed: May 1, 2008
    Date of Patent: November 16, 2010
    Assignee: Marvell International Ltd.
    Inventors: Yungping Hu, Mao Yu
  • Patent number: 7835459
    Abstract: One embodiment comprises a transmitter precoder operating on an input signal to produce an output signal for modulation. The output signal is transmitted using a constellation with a constellation density. The transmitter precoder comprises scaler logic, precoder logic and selection logic. The scaler logic scales the input signal to maintain constant power on the input signal independent of the constellation density. The precoder logic precodes the scaled signal to produce a dither signal limited to a range of values. The range is inversely proportional to the constellation density. The selection logic is operable in two states. In the first state, the selection logic combines the scaled signal with the dither signal to produce the output signal. In the second state, the selection provides the scaled signal as the output signal.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: November 16, 2010
    Assignee: Paradyne Corporation
    Inventor: William L. Betts
  • Patent number: 7835428
    Abstract: A MODEM device includes a detector configured to detect a synchronization signal transmitted from a source MODEM in a resynchronization process of a primary channel and a timer configured to count up starting from a beginning of a detection of the synchronization signal, and send information to forcibly move into a receiving mode for receiving image data when a time period from the beginning to a completion of the detection of the synchronization signal exceeds a predetermined time period.
    Type: Grant
    Filed: August 9, 2006
    Date of Patent: November 16, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Masashi Tokuda, Hirofumi Nishi
  • Patent number: 7830998
    Abstract: A communications system permits bandwidth configurability using a linear frequency modulated (LFM) waveform for transmitter/receiver synchronization. The system permits enhancement of MIL-STD-1553 data buses, and is likewise applicable to any bandwidth-configurable modem.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: November 9, 2010
    Assignee: Edgewater Computer Systems, Inc.
    Inventor: John Fanson
  • Patent number: 7830971
    Abstract: An apparatus and method for detecting a GCL sequence using a magnitude and a sign of a real part of a I/FDFT output except an imaginary part in a wireless communication system. The apparatus includes: a modified inverse/forward discrete fourier transform (I/FDFT) processing unit for enabling that the GCL sequence class u is detected with only a real part; a real value selecting unit for selecting real parts from the output of the I/FDFT processing unit; and a maximum value detecting unit for detecting a maximum value among magnitudes of the selected real parts having a positive sign from the real value selecting unit.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: November 9, 2010
    Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.
    Inventors: Hyun-Gu Hwang, Hyeong-Jun Park
  • Patent number: 7830989
    Abstract: In one embodiment, a wafer scale radar antenna module (WSAM) is provided that includes: a substrate; a plurality of antennas adjacent the substrate; an RF feed network adjacent the substrate, the RF feed network coupling to a distributed plurality of amplifiers integrated with the substrate, wherein the RF feed network and the distributed plurality of amplifiers are configured to form a resonant network such that if a timing signal is injected into an input port of the RF feed network, the resonant network oscillates to provide a globally synchronized RF signal to a plurality of integrated antenna circuits, wherein each integrated antenna circuits includes a corresponding subset of antennas from the plurality of antennas, and wherein each integrated antenna circuit includes a pulse shaping circuit having a plurality of selectable delay paths, each pulse shaping circuit being configured to rectify and level shift a version of the globally synchronized signal through selected ones of the selectable delay paths
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: November 9, 2010
    Inventor: Farrokh Mohamadi
  • Patent number: 7826541
    Abstract: A wireless relay system for relaying a radio signal transmitted from a first wireless station to a second wireless station via a wireless relay apparatus is disclosed. The wireless relay system includes a relay control part for receiving transmission symbols transmitted from the first wireless station and refraining from relaying a portion of the symbols, a pilot signal transmission part for transmitting a pilot signal that is inserted into a section of the portion of the transmission symbols, a coupling loop interference wave estimation part for receiving the pilot signal and estimating a coupling loop interference wave based on the pilot signal, and a coupling loop interference wave cancellation part for subtracting the estimated coupling loop interference wave from a reception signal.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: November 2, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiromasa Fujii, Hirohito Suda, Tetsu Tanaka
  • Patent number: 7826567
    Abstract: Receivers (1) for receiving frequency signals are, to improve their time synchronization accuracy, provided with synchronization stages (20) for performing a coarse time synchronization through autocorrelating samples of a group of preamble symbols (t1,t2,t3) and a fine time synchronization through crosscorrelating samples of a further group of preamble symbols (t10,G1) with predefined samples. The synchronization stages (20) also perform a coarse and a fine frequency synchronization through detecting and accumulating phases of samples of a yet further group of preamble symbols (t8,t9) and of another group of preamble symbols (T1,T2). The synchronization stages (20) have buffering units (21) and controlling units (22) for controlling mixing units (11) and transformating units (12) in processing stages (10). The preamble symbols have ten short preamble symbols (t1-t10), a guard interval preamble symbol (G 1) and two training symbols (T 1,T2).
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: November 2, 2010
    Assignee: NXP B.V.
    Inventors: Paulus Wilhelmus Franciscus Gruijters, Lucas Hendrikus Gerardus Tan
  • Patent number: 7826523
    Abstract: A noise level of an input signal is determined by a noise calculation module. based on the noise level, a boundary setting module sets a reduced constellation boundary interval. This reduced constellation boundary interval is employed by an equalizer to perform adaptive equalization of the input signal.
    Type: Grant
    Filed: March 31, 2006
    Date of Patent: November 2, 2010
    Assignee: Intel Corporation
    Inventors: Ahmed Said, Elias J. Nemer, Gregory R. Goslin