Multi-receiver Or Interference Cancellation Patents (Class 375/148)
  • Patent number: 9264266
    Abstract: A method and system for receiving and decoding horizontally encoded MIMO-OFDM transmissions with improved efficiency. In one embodiment, MIMO decoding is performed on each of the extracted separate tones of a MIMO-OFDM signal to extract and demodulate frequency domain symbols of the first layer corresponding to one or more code blocks. For each code block of the first layer that passes an error check, corresponding portions of the second layer are decoded using SIMO decoding.
    Type: Grant
    Filed: December 29, 2011
    Date of Patent: February 16, 2016
    Assignee: Intel Corporation
    Inventors: Tzahi Weisman, Tom Harel, Ayelet Doron
  • Patent number: 9254787
    Abstract: A method of operating an audio system in an automobile includes identifying a user of the audio system. An audio recording playing on the audio system is identified. An audio setting entered into the audio system by the identified user while the audio recording is being played by the audio system is sensed. The sensed audio setting is stored in memory in association with the identified user and the identified audio recording. The audio recording is retrieved from memory with the sensed audio setting being embedded in the retrieved audio recording as a watermark signal. The retrieved audio recording is played on the audio system with the embedded sensed audio setting being automatically implemented by the audio system during the playing.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: February 9, 2016
    Assignee: Panasonic Automotive Systems Company of America, Division of Panasonic Corporation of North America
    Inventors: Shree Jaisimha, Dallas Hickerson, Tatsuya Fujisawa
  • Patent number: 9252868
    Abstract: In one implementation, a wireless communication terminal includes a primary antenna array and a first controller configured to steer a main beam of the primary antenna array in a desired direction. The wireless communication terminal also includes an auxiliary antenna array and a second controller configured to control complex weights to be applied by at least some antenna elements of the auxiliary antenna array to corresponding variants of a second signal received by the at least some auxiliary antenna elements. Furthermore, the wireless communication terminal includes at least one signal combiner configured to combine variants of the second signal received from auxiliary antenna elements into an interfering signal that models interference from a co-located wireless communication terminal and subtract the interfering signal from variants of the first signal received from antenna elements of the principal antenna array to produce an interference mitigated signal.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: February 2, 2016
    Assignee: Iridium Satellite LLC
    Inventor: Jeffrey Francis Bull
  • Patent number: 9246731
    Abstract: An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup table based predistortion, which is a cascade of a lookup table predistortion and piecewise pre-equalizers.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: January 26, 2016
    Assignee: Dali Systems Co. Ltd.
    Inventors: Wan-Jong Kim, Kyoung Joon Cho, Jong Heon Kim, Shawn Patrick Stapleton
  • Patent number: 9241343
    Abstract: A method of performing Pseudo-random-Noise (PN) quadrature covering for transmitting data via an access channel. The method according to one embodiment includes receiving a 42-bit access long code mask MIACMAC and a 42-bit access long code mask MQACMAC from an upper layer; generating an MI mask and an MQ mask for PN quadrature covering by using certain bits of an assigned channel number for the access channel; performing exclusive OR operations on certain bits of the received access long code mask MIACMAC; performing exclusive OR operations on certain bits of the received access long code mask MQACMAC; and transmitting signals via the access channel based on the generated 12-bit MI mask and the generated 12-bit MQ mask.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: January 19, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Dongwook Roh, Sanggook Kim, Lihsiang Sun
  • Patent number: 9236902
    Abstract: The present invention describes a method and apparatus for implementing a mobile receiver (10) that combats multiple access interference (MAI) in a code division multiple access (CDMA) spread spectrum system. Such capability is required by mobile receivers to support high data rate applications such as the ones provided by HSDPA and 1xTREME. A receiver (10) combining equalization and interference cancellation (IC), according to the invention, avoids the shortcomings of either equalization or IC and provides superior performance relative to prior art methodologies. The approach proposed by this invention for the operation of the mobile receiver is to first perform equalization (12) of the received signal (r) and then use the resulting decisions to perform IC. Combining equalization and IC yields a complexity that is smaller to that obtained by implementing conventional IC with a Rake receiver for the same performance.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: January 12, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Aris Papasakellariou
  • Patent number: 9232441
    Abstract: Systems and methods of selecting a data rate for a wireless communication device are disclosed. Data indicative of a power constraint of a first computing device using the wireless communication device may be transmitted to a second computing device. A maximum data rate may be identified based on, at least in part, a power constraint of the first computing device.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: January 5, 2016
    Assignee: QUALCOMM Incorporated
    Inventor: Liron Manor
  • Patent number: 9231652
    Abstract: A method for searching a signal to capture a target signal. Integrated correlation values are acquired with all code phases by setting a plurality of frequencies at intervals of 1,000 Hz into a single group. A peak correlation value that is a highest integrated correlation value with each frequency forming the group is acquired. The peak correlation values of the respective frequencies are compared to each other, a highest value thereof is set to be a highest peak value, and a second highest value thereof is set to be a highest noise value. If a ratio between the highest peak value and the highest noise value is lower than a threshold, it is determined that cross-correlation occurred, and if the ratio is higher than the threshold, the highest peak value is determined to be from the target signal, and the signal is captured.
    Type: Grant
    Filed: February 18, 2013
    Date of Patent: January 5, 2016
    Assignee: Furuno Electric Co., Ltd.
    Inventors: Akihiro Osugi, Kazuto Tada
  • Patent number: 9226249
    Abstract: The present invention relates to a receiver comprising a fast power control unit, said fast power control unit being arranged to continuously control a quality measure of a radio channel. The receiver is characterized in that the quality measure is a modified Signal to Interference plus noise ratio (SIR) in which the influence from self interference has been removed. The invention further relates to a method for continuously controlling a quality measure of a radio channel, wherein a modified Signal to Interference plus noise ratio (SIR) is continuously determined in which the influence from self interference has been removed.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: December 29, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Girum Alebachew, Carmela Cozzo, Gregory E. Bottomley, Fredrik Huss, Gunnar Peters
  • Patent number: 9214983
    Abstract: A system that incorporates the subject disclosure may perform, for example, a method for receiving interference information from each of the plurality of communication devices detecting interference information in a plurality of segments of a radio frequency spectrum, correlating the interference information of the plurality of communication devices to generate correlated information, and identifying a plurality of interferers according to the correlated information. Other embodiments are disclosed.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: December 15, 2015
    Assignee: ISCO INTERNATIONAL, LLC
    Inventors: Amr Abdelmonem, Sean S. Cordone, Dariusz Seskiewicz, Bill Myers, Krishna Komoravolu
  • Patent number: 9210016
    Abstract: A design of cognitive radio (CR) signal structure which based on the spectral correlation can be used for active sensing. In this signal structure, the known pilots used for the primary users (PUs) are duplicated and reallocated in the CR transmission signal properly. With this CR signal structure, the received signal of spectrum sensors will become correlated on the subcarriers when PU reoccupation occurs while the CR transmission is active, and thus PU activities can easily be detected by computing the spectral correlation function. As compare with the traditional cyclostationary feature detection scheme, this method can enhance the active sensing performance while remaining the service quality of the CR system, achieving better detection performance in the same detection time, reducing sensing time (about 1/10 of the traditional sensing time), and still reaching the satisfactory outcome even in the circumstances of low SNR and SINR.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: December 8, 2015
    Assignee: NATIONAL TSING HUA UNIVERSITY
    Inventors: Chin-Liang Wang, Han-Wei Chen
  • Patent number: 9209941
    Abstract: Aspects of a method and system for diversity processing utilizing a programmable interface suppression module may include one or more circuits that are operable to program an interference suppression module based on one or more interference cancellation parameters. A plurality of weighting factor values may be computed based on the one or more interference suppression parameters and a received plurality of multipath signals. A plurality of estimated signal may be generated based on the plurality of weighting factor values. A plurality of updated estimated signals may be generated based on the plurality of estimated signals. A plurality of interference suppressed signals may be generated based on the plurality of updated estimated signals.
    Type: Grant
    Filed: August 12, 2013
    Date of Patent: December 8, 2015
    Assignee: Broadcom Corporation
    Inventors: Mark Hahm, Wei Luo
  • Patent number: 9203483
    Abstract: A reception apparatus includes a plurality of reception antennas configured to receive transmission signals transmitted from a plurality of transmission antennas, a first interference processing section configured to perform a weighting processing of imparting a weight to reduce a multipath interference component corresponding to an intersymbol interference based on a multipath while leaving an inter-antenna interference component corresponding to an interference component imparted by a transmission signal from one transmission antenna on the transmission signal from another transmission antenna among the plurality of transmission antennas with respect to each of a plurality of reception signals received by the plurality of reception antennas, and a second interference processing section configured to remove the inter-antenna interference component with respect to each of the plurality of reception signals on which the weighting processing is performed.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: December 1, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Tsuyoshi Hasegawa
  • Patent number: 9203480
    Abstract: A distributed wireless communication system includes multiple access points, each with one or more antennas. The access points do not necessarily have synchronized transmitting and receiving radio frequency oscillators. Approaches to channel estimation between the access points and one or more wireless clients account for the lack of synchronization, and do not necessarily require capabilities at the clients that go beyond required or optional features of standard wireless Ethernet (e.g., 802.11n, 802.11g, or 802.11a), thereby supporting “legacy” clients while supporting high data throughput approaches that provide coherent transmission from the multiple antenna of the access points.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: December 1, 2015
    Assignee: Massachusetts Institute of Technology
    Inventors: Hariharan Shankar Rahul, Swarun Suresh Kumar, Dina Katabi
  • Patent number: 9198165
    Abstract: A wireless base station (eNB1-1) uses in a differentiated manner, depending on the expected data amount of downlink transmission to the serving wireless terminal UE, the transmission of RRC Connection Reconfiguration messages in which SRS specific transmission request information is set, and the transmission of RRC Connection Reconfiguration messages in which SRS hopping transmission request information is set.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: November 24, 2015
    Assignee: KYOCERA Corporation
    Inventors: Yoshizo Sato, Masaaki Nakata, Nobuaki Takamatsu, Masahiro Yagi, Hiroki Fujita
  • Patent number: 9198187
    Abstract: In the method, a user device detects interferences a single dominant interferer of a neighbor base station, said user device provided with at least two antennas and said user device connected to a main base station, said main base station introducing a pattern of transmission gaps for certain Resource Elements in the Resource Element mapping function by switching off the transmission, being said certain Resource Elements in the Resource Element mapping function introduced for the PDSCH complex symbols.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: November 24, 2015
    Assignee: Telefonica, S.A.
    Inventor: Francisco Javier Lorca Hernando
  • Patent number: 9178561
    Abstract: A plurality of samples of a signal are stored in a buffer, the signal corresponding to a navigation system. A plurality of starting locations in the buffer are determined, the plurality of starting locations corresponding to a plurality of correlations to be calculated. A plurality of correlations are calculated using i) a plurality of local replica signals, and ii) data read from the buffer using the plurality of starting locations, the local replica signals corresponding to pseudo random number (PRN) codes utilized by transmitting devices in the navigation system. The plurality of correlations are utilized to one or more of i) detect PRN codes in the signal, ii) detect one or more phase shifts associated with PRN codes, or iii) detect one or more frequency shifts associated with PRN codes.
    Type: Grant
    Filed: September 10, 2014
    Date of Patent: November 3, 2015
    Assignee: MARVELL WORLD TRADE LTD.
    Inventors: Feng Xu, Zhike Jia
  • Patent number: 9167536
    Abstract: Methods and apparatus for improving amplitude estimation of a received signal in a wireless communication system is provided. Aspects of the methods and apparatus relate to investigating estimation of signal-to-noise (SNR) of the signal. To estimate SNR of the signal, a user equipment (UE) combines previous pilot amplitude measurements and the present pilot amplitude measurement along with received transmit power control (TPC) commands.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: October 20, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Roee Cohen
  • Patent number: 9154340
    Abstract: Disclosed is a method of cancelling inter-subcarrier interferences in distributed antenna system. A method of cancelling interference performed in a transmitting station may include configuring a least one Alamouti pair by mapping subcarrier to each of input symbols, performing a 2N-point inverse fast Fourier transform (IFFT) on the at least one Alamouti pair, wherein the N is a natural number, and performing a frequency up converting on signals on which the 2N-point IFFT performed. Therefore, the inter-subcarrier interferences can be canceled efficiently.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: October 6, 2015
    Assignees: POSTECH ACADEMY-INDUSTRY FOUNDATION, INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YEUNGNAM UNIVERSITY
    Inventors: Kwon Hue Choi, Bong Seok Kim
  • Patent number: 9137057
    Abstract: A method and system for optimizing symbol mapping in partial response based communications that are based on use of pulse-shaping that incorporates a predetermined amount of inter-symbol interference (ISI). Optimizing symbol mapping symbol mapping may comprise configuring optimized constellation mapping for use in mapping and/or de-mapping data communicated using the partial response pulse-shaping. In this regard, the optimized constellation mapping may be based on a reference constellation mapping that is utilized for reference modulation scheme, and the configuring comprises applying adjustments to one or more constellation points in the reference constellation mapping. The optimized constellation mapping may be configured to optimize an applicable minimum distance for one or more selected error patterns for a given spectral compression applied during partial response based communications.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: September 15, 2015
    Assignee: MagnaCom Ltd.
    Inventor: Amir Eliaz
  • Patent number: 9124336
    Abstract: A receiver has an input for an incoming signal, the incoming signal possibly having a wanted signal and one or more interference signals. The receiver further has a signal source for providing a predetermined signal that is substantially identical to at least a portion of at least one interference signal of the one or more interference signals. The receiver also has a signal analyzer for analyzing the incoming signal regarding at least one known signal component of at least one of the one or more interference signals to obtain at least one interference signal parameter. A cancellation signal generator generates a cancellation signal on the basis of the at least one interference signal parameter. The receiver further has an interference canceller for at least partially cancelling the at least one interference signal by applying the cancellation signal to the incoming signal. A corresponding transmitter and a method for interference cancellation are also disclosed.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: September 1, 2015
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Martin Leyh, Aharon Vargas Barroso, Michael Schlict, Frank Mayer
  • Patent number: 9118515
    Abstract: A channel estimation processor for a receiver in a wireless communication system is described. The channel estimation processor includes a stage-1 processor (STG1) arranged to pluralities of Nsym reference symbol correlation values per slot. The channel estimation processor includes a stage-2 processor (STG2) comprising a plurality of stage-2a processors for obtaining filtered outputs per slot, a respective plurality of stage-2b processors for obtaining respective slot filter results and a stage-2 adder (STG2ADD) for obtaining channel estimates for respective anchor positions. The stage-2a processors are arranged to filter respective pluralities of reference symbol correlation values using respective reference symbol filters (ga) to obtain a respective filtered output per slot.
    Type: Grant
    Filed: January 8, 2014
    Date of Patent: August 25, 2015
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Amit Bar-Or, Kfir Bezalel, Gideon S. Kutz
  • Patent number: 9112778
    Abstract: A technique capable of effectively using a plurality of wireless communication systems for wirelessly communicating by different communication schemes is proposed. The present invention is configured so that: a land station of a first wireless communication system, a land station of a second wireless communication system, and a control device are connected by a network; the control device transmits instructions for modifying communication software used in wireless communication into communication software corresponding to the second wireless communication system, the instructions being transmitted to a land station of the first wireless communication system; and the land station of the first wireless communication system modifies the communication software in accordance with the instructions from the control device, whereby the land station of the first wireless communication system made to operate as a land station of the second wireless communication system.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: August 18, 2015
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventor: Kazuhiro Yamamoto
  • Patent number: 9106495
    Abstract: Disclosed are a wireless communication method of improving frequency efficiency based on a channel function in a wireless communication system and an apparatus thereof. The wireless communication system using a digital modulation scheme, includes: a transmitting apparatus which modulates a data signal to generate a modulation symbol, generates a channel symbol function corresponding to the modulation symbol, combines the modulation symbol with the channel symbol function to generate a transmission symbol to transmit the generated transmission symbol through a transmission antenna; and a receiving apparatus which receives the transmission symbol through a reception antenna, estimates a channel symbol function included in the transmission symbol, and extracts the data signal based on the modulation symbol included in the transmission symbol.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: August 11, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kwang Seon Kim, Min Soo Kang, Bong Su Kim, Woo Jin Byun, Jong Soo Lim, Myung Sun Song, Jae Ick Choi
  • Patent number: 9106416
    Abstract: A radio front end includes a power amplifier, a tone injection module, a duplexer, a balancing network, and a processor. The tone injection module is operable, in a first mode, to produce a tone having a carrier frequency that is substantially similar to a carrier frequency of an inbound wireless signal. The duplexer is operable, in the first mode, to provide electrical isolation between the outbound wireless signal and a combination signal of the tone and inbound wireless signal and is operable, in a second mode, to provide electrical isolation between the outbound wireless signal and the inbound wireless signal. The processor is operable to determine an amplitude of a tone component of the combination signal; correlate the amplitude of the tone component to an inbound frequency band isolation; and adjust baseband processing of a down converted representation of the combination signal based on the inbound frequency band isolation.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: August 11, 2015
    Assignee: Broadcom Corporation
    Inventors: Mohyee Mikhemar, Hooman Darabi
  • Patent number: 9065594
    Abstract: Bluetooth file transfers using FTP do not provide upper-layer reliability checking and rely on the Bluetooth device physical layer providing reliable data to upper layers of a Bluetooth stack. However, reliability checks implemented by the physical layer are typically not very robust and in some cases may fail to detect errors, thus may provide corrupted data to the upper layers for further processing and may result in data corruption/transfer failure. Non-FTP Bluetooth file transfers are typically more robust when it comes to reliability checking because of upper layer reliability checks. Functionality can be implemented to vary packet transmission parameters depending on a Bluetooth profile implemented on a communication link. A packet error rate of received packets can be compared against a different set of thresholds depending on whether the Bluetooth profile is an FTP profile. Appropriate values of packet transmission parameters can be selected based on the above comparison.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: June 23, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Paul J. Husted, Douglas J. Kogan, Praveen Dua
  • Patent number: 9059788
    Abstract: For determining paths in the scope of a multipath search, a device for use in a wireless communications system performs: obtaining a delay profile of a code division multiple access transmission signal, the delay profile being in a form of complex symbols, each complex symbols resulting from a despreading of said received signal after being delayed by a distinct delay; comparing the real part of said complex symbols forming the delay profile with a first threshold, the first threshold being determined on the basis of a noise level determined by the imaginary part of said complex symbols forming the delay profile; and determining said paths on the basis of the comparing.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: June 16, 2015
    Assignee: BROADCOM CORPORATION
    Inventors: Arnaud Rigollé, Pierre Didier
  • Patent number: 9054903
    Abstract: A method for equalizing a received radio signal in a WCDMA system, comprises receiving (210), in a radio receiver, of a digital radio signal spread by scrambling codes. A channel estimation is performed (230) on the received digital radio signal for a plurality of channels. The received digital radio signal is in an equalizer equalized (240) into an equalized digital radio signal. This equalizing is performed by combining a plurality of part signals, deduced from the digital radio signal, with a respective delay and a respective combining weight. The equalizing (240) comprises provision of the combining weights based on a signal impairment matrix having elements compensated for systematic colouring caused by said scrambling codes.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: June 9, 2015
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Ari Kangas, Henrik Egnell, Stephane Tessier
  • Patent number: 9055591
    Abstract: A scheduling method and an apparatus adapted thereto are disclosed that can allocate sub-carriers to a terminal at the cell edge in a wireless communication. The scheduling method includes, calculating average interference and instantaneous interference of at least two terminals for a sub-carrier, determining whether an interference for the sub-carrier is partial interference, and allocating a corresponding sub-carrier serving as transmission resource to a terminal having a higher ratio of the instantaneous interference compared to the average interference than the other terminal if an interference for the sub-carrier is partial interference.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: June 9, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Il Whan Kim, Sang-Boh Yun, Sung Soo Hwang
  • Patent number: 9042429
    Abstract: A radio receiver apparatus includes a serving cell detector configured to generate a detected serving cell signal based on a serving cell detector input signal. The radio receiver apparatus further includes a first interfering cell detector configured to generate a detected first interfering cell signal based on a first interfering cell detector input signal and a first interfering cell synthesizer configured to generate synthesized first interfering cell signal based on the detected first interfering cell signal. A serving cell interference removing unit is configured to remove the synthesized first interfering cell signal from a serving cell signal to generate the serving cell detector input signal.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: May 26, 2015
    Assignee: Intel Mobile Communications GmbH
    Inventors: Christian Faber, Andreas Senst, Manfred Zimmermann, Lothar Winkler
  • Patent number: 9042428
    Abstract: A system and method to more efficiently compute updated Frequency Domain (FD) Minimum Mean Squared Error (MMSE) equalization weights in a multi-stage Parallel Interference Cancellation (PIC) receiver after initial interference cancellation. The updated equalization weights (which are to be used during re-equalization) can be obtained using the old equalization weights already computed for initial interference cancellation. There is no need to invert an nR by nR matrix (where nR is the number of receive antennas) at each stage of the PIC receiver during each iteration of equalization and decoding operations. Rather, the matrix to be inverted to obtain updated equalization weights may be of the dimension n×n (where “n” equals the total number of transmission layers in a transmission scheme used in the wireless network).
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: May 26, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Yi-Pin Eric Wang
  • Publication number: 20150139280
    Abstract: This invention teaches to the details of an interference suppressing receiver for suppressing 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 suppression 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: Application
    Filed: October 22, 2014
    Publication date: May 21, 2015
    Inventors: Tommy Guess, Michael L. McCloud, Vijay Nagarajan, Gagandeep Singh Lamba
  • Patent number: 9036682
    Abstract: A method for mitigating a multi-path-induced error in a global navigation satellite system comprises, for a respective measurement epoch, obtaining respective representations of a composite signal including a plurality of value-pairs of the composite signal. The method further comprises, with respect to the measurement epoch: obtaining a plurality of coefficients for a set of linear equations based on the plurality of value-pairs of the composite signal; iteratively obtaining solutions for the set of linear equations, thereby solving for a code tracking timing offset, a time delay of a multi-path signal of the composite signal relative to its direct-path signal, and orthogonal representations of the multi-path signal; determining a phase error between the composite signal and the direct-path signal, due to the time delay, in accordance with the orthogonal representations of the multi-path signal; and correcting for the code tracking timing offset and the phase error.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: May 19, 2015
    Assignee: DEERE & COMPANY
    Inventors: Richard G. Keegan, Ronald R. Hatch
  • Patent number: 9036661
    Abstract: Systems, devices, processors, and methods are described which may be used for the reception of a wireless broadband signal at a user terminal from a gateway via a satellite. A wireless signal may include a series of physical layer frames, each frame including a physical layer header and payload. The received signal is digitized and processed using various novel physical layer headers and related techniques to synchronize the physical layer frames and recover data from physical layer headers for purposes of demodulation and decoding.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: May 19, 2015
    Assignee: ViaSat, Inc.
    Inventors: Donald W. Becker, Matthew D. Nimon, William H. Thesling
  • Patent number: 9036681
    Abstract: Linear symbol level equalisation is used to estimate a transmitted symbol vector xn(0) in an nth observation window yn of signals received from multiple users each using a different spreading code. An iterative conjugate gradient algorithm resolves a column vector z that satisfies Az=b, A being a square matrix and b being a column vector. The matrix vector product Apk used in each respective kth iteration of the algorithm is computed using at least one fast transform. The receiver or detector estimates a posterior mean {circumflex over (x)}LMMSE,n(0) from the computed column vector z, then utilises the estimated posterior mean to determine the transmitted symbol vector xn(0). The posterior mean {circumflex over (x)}LMMSE,n(0) may be estimated from matrix A and vector b. Different examples have the square matrix A with an inner or an outer product form; and have the fast transform as a fast Walsh-Hadamard transform and/or a fast (inverse) Fourier transform.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: May 19, 2015
    Assignee: BROADCOM CORPORATION
    Inventor: Lars Puggaard Bogild Christensen
  • Patent number: 9031117
    Abstract: Techniques for handling fingers with large delay spread through utility optimization are described. A first signal may be received, through a finger of a plurality of fingers in a receiver, at a time that is later than a reference time after a reference signal is received by a reference finger of the plurality of fingers. The reference signal may be included in an on-time group corresponding to a cell. The first signal may be included in a late group corresponding to a virtual cell. The first signal and the reference signal may be compared to one another. Based on the comparing, it may be determined whether to wait for additional signals in the late group or process the signals in the on-time group.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: May 12, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Tao Cui, Wei Zhang, Guang Xie
  • Patent number: 9026451
    Abstract: Methods and systems for using pitch predictors in speech/audio coders are provided. Techniques for optimal pre- and post-filtering are presented, and a general result that post-filtering is more effective than pre-filtering is derived. A practical paired-zero filter design for the low-rate regime is proposed, and this design is extended to handle frequency-dependent periodicity levels. Further, the methods described provide a general performance measure for a post-filter that only uses information available at the decoder, thereby allowing for the optimization or selection of a post-filter without increasing the rate.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: May 5, 2015
    Assignee: Google Inc.
    Inventors: Willem Bastiaan Kleijn, Jan Skoglund
  • Patent number: 9025640
    Abstract: A method and apparatus is provided for intra-PIT signal decomposition of a signal received with RF front end hardware. The method begins by aligning a signal received by RF front end hardware into integer multiples of a duration of a pseudorandom noise code sequence. A search grid is computed based on an integer multiple of the aligned signal. A plurality of initial ray parameters associated with the computed search grid is coarsely estimated. Using the coarsely estimated plurality of initial ray parameters, a fine estimation of the plurality of initial ray parameters is initiated utilizing stochastic search and optimization techniques. A stopping criteria statistic is computed by comparing a peak power of the search grid with a noise power present in the search grid. Finally, in response to determining the stopping criteria statistic being less than a stopping criteria threshold, processing a next integer multiple of the aligned signal.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: May 5, 2015
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Marshall E Haker, John F Raquet
  • Publication number: 20150112220
    Abstract: A system for and a method of wirelessly monitoring one or more patients can include transmitting ultra-wideband pulses toward the one or more patients, receiving ultra-wideband signals, and sampling the ultra-wideband signals. Sampling the ultra-wideband pulses can be performed with a sample rate that is less than the Nyquist rate. Impulse response can be estimated and/or recovered by exploiting sparsity of the impulse response.
    Type: Application
    Filed: October 23, 2014
    Publication date: April 23, 2015
    Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Furrukh Sana, Tarig Ballal Khidir Ahmed, Tareq Al-Naffouri, Ibrahim Hoteit
  • Patent number: 9014236
    Abstract: A method for performing joint detection includes adjusting a ranking order of codes in a matched filtering result, and a ranking order of column vectors in a system submatrix according to the power. The joint detection is performed using an adjusted matched filtering result and an adjusted system submatrix, and acquires demodulated signals corresponding to the codes. The codes that have high power will be demodulated first. This ensures accuracy of demodulation, inhibits erroneous propagation effect, and improves accuracy of the joint detection.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: April 21, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Zhixun Tang, Xie Li, Liping Zhang
  • Patent number: 9008249
    Abstract: Techniques are provided which may be implemented using various methods and/or apparatuses in a device comprising a receiver to scan a spectral band of a received signal comprising a desired signal contribution to determine whether signal data associated with at least a sub-band of the spectral band further comprises at least one undesired signal contribution. In response to determining that the signal data comprises at least one undesired signal contribution, the mobile station may initiate at least one notch filter to affect the undesired signal contribution in subsequent signal data associated with the received signal.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: April 14, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Jie Wu, Emilija M. Simic, Timothy Paul Pals, Duong A. Hoang
  • Patent number: 9008250
    Abstract: A method for canceling adjacent channel interference includes: receiving signal of a first channel, where an interference signal of a second channel remains in the signal of the first channel, and the second channel and the first channel are adjacent channels; receiving a cancellation signal provided by the second channel for canceling the interference signal; filtering the received cancellation signal; adjusting a frequency of the filtered cancellation signal; multiplying the cancellation signal with the adjusted frequency by a gain factor to obtain a signal to be cancelled; and subtracting the signal to be cancelled from the signal of the first channel, and canceling the interference signal to obtain a signal to be decoded. According to the technical solutions provided in the embodiments of the present invention, interference signals of adjacent channels are cancelled, and the signal to noise ratio is improved.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: April 14, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Guixue Zhao
  • Patent number: 9008154
    Abstract: Aspects of the present invention include methods, systems, and computer-readable medium for canceling interference in wireless communication. The method includes receiving wireless CDMA communication signals using one or more antennas at least from a first entity via a first communication channel and a second entity via a second communication channel, determining a set of known characteristics associated with the first entity, the first set of characteristics comprising a first signal strength, a first synchronization information, and an first channel identification information, and determining an aggregate signal matrix based on signals received from at least the first entity and the second entity.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: April 14, 2015
    Assignee: Shanghai Mobilepeak Semiconductor Co., Ltd.
    Inventors: Weiping Xu, Feng Wan, Liang Xu, Yuan Li, Qiuzhen Zou
  • Patent number: 9008246
    Abstract: The present technique relates to a transmission device, a transmission method, a reception device, a reception method, a program, and a communication system which can realize a system capable of promptly addressing a newly-generated disturbance wave. A broadcasting device of the present disclosure includes: a reception unit which receives reception interference information notified from the reception device; a setting unit which sets a frequency of a notch to be provided in a transmission signal on the basis of the reception interference information that has been received; a modulation unit which provides the notch in accordance with the set frequency of the notch while at the same time generates a modulated signal by modulating information to be transmitted; and a send-out unit which sends out the modulated signal as the transmission signal.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: April 14, 2015
    Assignee: Sony Corporation
    Inventors: Hiroo Takahashi, Takahiro Okada
  • Patent number: 9001867
    Abstract: A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus receives an intended signal from a first wireless device operating in a full-duplex mode, receives an interfering signal from a second wireless device communicating with the first wireless device, and reduces an interference of the received intended signal caused by the interfering signal by projecting a matrix of the received intended signal onto a space associated with the interfering signal.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: April 7, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Hua Wang, Achaleshwar Sahai, Zrinka Puljiz, Shailesh Patil, Pablo Alejandro Anigstein, Junyi Li
  • Patent number: 9001866
    Abstract: A communication node (115) with is arranged to receive signals from at least one antenna (120). A frequency domain conversion is executed (201) for two or more antenna signals by receiving (201a) a continuous signal from one of the at least one antenna (120), splitting (201b) the continuous antenna signal into windowed signals, and performing (201e) a frequency domain conversion of the windowed signals. Then, a channel estimate based on a frequency converted pilot signal is provided (202) by extracting (202a) a pilot signal, splitting (202b) the pilot signal into windowed signals, performing (202d) a frequency domain conversion of the split pilot signal; and providing (202e) a channel estimate of the frequency converted pilot signal. Diversity combined signals are provided (203) by performing (203a) diversity combining based on the frequency converted windowed signals and the channel estimate, and by combining (203c) the diversity combined signals.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: April 7, 2015
    Assignee: Unwired Planet, LLC
    Inventors: Bjorn Sihlbom, Bo Lyckegard
  • Patent number: 9001954
    Abstract: A reception circuit that receives data in serial communications through a plurality of lanes includes a plurality of buffers provided for each of the plurality of lanes that each stores data received through corresponding lane, a multilane control circuit that detects the skew between the lanes, and outputs an adjustment instruction for adjusting a read address of a buffer and a deskew information indicating that a skew adjustment between which buffer the lanes is to be performed based on the detected skew, and a plurality of address control circuits provided for each of the plurality of lanes that each transmits the adjustment instruction to a corresponding buffer when receiving the deskew information, wherein the buffer that has received the adjustment instruction adjusting its read address.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: April 7, 2015
    Assignee: Fujitsu Limited
    Inventors: Ryuji Iwatsuki, Kazumi Hayasaka
  • Patent number: 9002282
    Abstract: A coexistence system including a first transceiver module in a first network device, generating a first request signal that requests transmission or reception for the first transceiver module, and operating according to a first wireless communication standard. An interface, based on the first request signal, generates a first priority signal, which indicates a first priority level of first data signals. A second transceiver module is in the first network device and generates a second request and priority signals. The second transceiver module operates according to a second wireless communication standard. The second request signal requests transmission or reception for the first transceiver module. The second priority signal indicates a second priority level of second data signals. An arbitration module (i) based on the first and second priority levels, arbitrates the first and second request signals, and (ii) based thereon, selectively connects antennas to the first and second transceiver modules.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: April 7, 2015
    Assignee: Marvell International Ltd.
    Inventors: Josselin de la Broise, Li-Fu Jeng, Deepak Jain, Rajesh Juluri
  • Publication number: 20150092821
    Abstract: Methods, systems, and devices for maximizing signal to interference plus noise ratio of a channel in a location tracking system. The methods, systems, and device may include tools and techniques for minimizing interference from adjacent samples at a receive filter, may include relaxing constraints at a transmitter. A receive filter or set of receive, or both, filters may be determined and utilized by specifying and or determining various transmitter, receiver, and channel characteristics. The receive filter and set of filters may be determined through an iterative approach involving one or more solution metrics.
    Type: Application
    Filed: September 30, 2013
    Publication date: April 2, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Alok Kumar Gupta, Siavash Ekbatani
  • Patent number: 8995498
    Abstract: An apparatus and method for a two-stage linear/nonlinear interference cancellation comprising processing a receive signal to produce a first descrambled signal; and processing the first descrambled signal to produce a detected signal. In one aspect, a first interference canceller module is used for processing the received signal and a second interference canceller module is used for processing the first descrambled signal. In one aspect, the first interference canceller is a linear interference canceller (IC) and the second interference canceller is a linear/nonlinear interference canceller (IC).
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: March 31, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Yingqun Yu, Farrokh Abrishamkar, Wenjun Li, Andrew K. Kan