Correlative Or Matched Filter Patents (Class 375/343)
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Publication number: 20130202068Abstract: A mechanism can be implemented for reducing the power consumption of a wireless radio device in establishing a wireless connection by utilizing a wideband signal to detect a narrowband trigger signal at a potential narrowband trigger frequency. The wireless radio device may operate a wideband receiver to receive an RF signal. Being aware of the potential narrowband trigger frequencies, the wideband receiver may utilize the received RF signal to detect the presence of a narrowband trigger signal at one of the potential narrowband trigger frequencies.Type: ApplicationFiled: February 6, 2012Publication date: August 8, 2013Applicant: QUALCOMM ATHEROS, INC.Inventors: Yann Ly-Gagnon, Paul J. Husted, Olaf J. Hirsch
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Publication number: 20130202069Abstract: The present disclosure provides a frequency offset compensation technique for use by a multi-carrier receiver. Compared with legacy receiver designs, the technique introduces a new function which correlates various frequency offsets of the different carriers involved in multi-carrier signal transmission and reception. This new function can be coupled with an Automatic Frequency Control (AFC) function which can then utilize the correlation information provided by the new function to achieve significantly better frequency error/offset estimation when the carriers are correlated.Type: ApplicationFiled: May 6, 2011Publication date: August 8, 2013Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Thomas Nilsson, Amit Singh
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Patent number: 8503581Abstract: An improved encoding and decoding method for the transmission and estimation of multiple simultaneous channels, thereby solving the problem of shortening the time required to measure the attenuation, absorption or distortion of signals passing through a predetermined medium.Type: GrantFiled: November 24, 2008Date of Patent: August 6, 2013Inventor: Vicente Diaz Fuente
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Patent number: 8503511Abstract: A receiver apparatus for determining a correlation value of a predetermined repetitive chip sequence in a receive signal, the chip sequence having a chip sequence duration and a chip sequence duration cycle. The receiver apparatus has a receive unit for receiving the receive signal and a segmenter for providing receive signal segments from the receive signal, two receive signals representing the same chip sequence in different repetition cycles and having at least one repetition cycle time spacing.Type: GrantFiled: September 29, 2008Date of Patent: August 6, 2013Assignee: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung e.V.Inventor: Ion Suberviola
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Patent number: 8503587Abstract: Peak fade depth is measured (202) over a period of time, and a bandwidth of a channel filter (104) is then determined (206) according to the measured peak fade depth (202). In preferred embodiments the average peak fade depth over two or more time slots is used. In a specific embodiment, an ? filter (206) is used to determine the bandwidth of the matched filter (104), in which ? is determined based upon the measured peak fade depth (204). In various embodiments, peak fade depth is correlated to the Doppler shifting of the channel, which in turn is used to determine the bandwidth of the matched filter by way of the ? parameter. Hence, a non-linear equation can be used to determine the value of ? which yields a minimum bit error rate for the matched filter (104).Type: GrantFiled: May 23, 2011Date of Patent: August 6, 2013Assignee: Harris CorporationInventor: Mac L. Hartless
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Patent number: 8503586Abstract: The present invention relates to a receiving apparatus for receiving signals in a communication system in which the signals are transmitted on the basis of frames. Each frame includes a data part having data blocks, wherein the data blocks are respectively separated by a guard sequence. The receiving apparatus performs a correlation on the guard sequences of a received signal and performs a clock drift estimation in the frequency domain on the basis of the correlation results. The receiving apparatus also compensates the clock drift of the received signal on the basis of the clock drift estimation.Type: GrantFiled: March 24, 2010Date of Patent: August 6, 2013Assignee: Sony CorporationInventors: Zhaocheng Wang, Qi Wang, Richard Stirling-Gallacher, Ralf Boehnke
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Patent number: 8503579Abstract: The channel estimator includes a plurality of correlating sections configured to calculate a plurality of time correlation values between the signal and a plurality of known pattern signals having different code lengths, an analyzing section configured to output a control signal representing a selected period for extracting a preferable correlation output from the output from each of the plurality of correlating sections, and a delay profile generating section configured to output a delay profile obtained by adaptively selecting or combining parts of the outputs from the plurality of correlating sections based on the output from the analyzing section.Type: GrantFiled: July 12, 2010Date of Patent: August 6, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Tatsuhisa Furukawa, Hidehiro Matsuoka
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Patent number: 8503565Abstract: A multiple antenna communication method and a multiple antenna communication system are provided. The multiple antenna communication method includes: determining a weighting vector with respect to a plurality of transmit antennas, using a spread spectrum code; determining a target transmission rate of each of the transmit antennas using the determined weighting vector; transmitting information associated with the target transmission rate to a multiple antenna reception apparatus; receiving, from the multiple antenna reception apparatus, channel information including information regarding whether to accept the transmitted target transmission rate information; and transmitting data to the multiple antenna reception apparatus using the received channel information.Type: GrantFiled: October 23, 2008Date of Patent: August 6, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Woo Yong Lee, Hyoung Jin Kwon, Kyeongpyo Kim, Jin Kyeong Kim, Yong Sun Kim, Jae Sup Lee, Young-chai Ko
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Patent number: 8503553Abstract: An integrated circuit includes logic configured to encode pilot signals in a first set of subcarriers of an orthogonal frequency division multiplexing (“OFDM”) symbol and in a second set of subcarriers of a consecutive OFDM symbol. The symbol and the consecutive symbol are in the same smart-utility-network packet.Type: GrantFiled: December 6, 2010Date of Patent: August 6, 2013Assignee: Texas Instruments IncorporatedInventors: Timothy M. Schmidl, Anuj Batra
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Patent number: 8503485Abstract: Techniques for facilitating cell search by user equipments (UEs) in a wireless communication system are described. In an aspect, a primary synchronization code (PSC) sequence may be generated based on a Frank sequence and a constant amplitude sequence that is repeated multiple times. In another aspect, a set of PSC sequences may be generated based on complementary sequences having good aperiodic correlation properties and efficient implementations. In one design, PSC sequences A+B and B+A may be formed based on Golay complementary sequences A and B, there “+” denotes concatenation. In yet another aspect, a set of secondary synchronization code (SSC) sequences may be generated based on a set of base sequences and different modulation symbols of a modulation scheme. Each base sequence may be modulated by each of M possible modulation symbols for the modulation scheme to obtain M different SSC sequences.Type: GrantFiled: October 1, 2007Date of Patent: August 6, 2013Assignee: QUALCOMM IncorporatedInventors: Durga Prasad Malladi, Byoung-Hoon Kim, Tao Luo
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Patent number: 8503504Abstract: This method for estimating a carrier-frequency offset in a telecommunication signals receiver comprises the following steps: computation of the partial correlations relating to several successive portions of a reference binary sequence, each partial correlation being computed between a portion of a signal received by the receiver at said carrier frequency, this signal comprising said reference binary sequence, and a predetermined portion of said reference binary sequence stored and/or generated by the receiver, in several possible relative positions between the received signal and the predetermined portion, and determination of the carrier-frequency offset from the computed partial correlations. It also comprises a step of selecting a synchronization position and the determination step comprises the estimation of a phase shift between computed partial correlations at the selected synchronization position.Type: GrantFiled: February 22, 2010Date of Patent: August 6, 2013Assignee: Comissariat á l'Energie AtomiqueInventor: François Dehmas
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Publication number: 20130195229Abstract: A receiver unit of a communication device can employ multiple correlators for decoding the access address of a packet received from another communication device. A dynamically determined primary frequency offset is applied to a phase difference signal that is determined from an RF signal that comprises the packet. For each of a plurality of access address decoding chains of the receiver unit, a secondary frequency offset associated with the access address decoding chain is applied to the phase difference signal, the phase difference signal is correlated with a predetermined access address of the communication device, and a resultant correlation output is compared against a correlation threshold. One of the access address decoding chains that generated the correlation output that is greater than the correlation threshold is selected and the packet is demodulated based, at least in part, on the phase difference signal corresponding to the selected access address decoding chain.Type: ApplicationFiled: May 7, 2012Publication date: August 1, 2013Applicant: QUALCOMM ATHEROS, Inc.Inventors: Hao-Jen CHENG, Qinfang SUN
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Patent number: 8498358Abstract: Communication between a base station with multiple transmission antennas and a mobile station is provided. The base station and the mobile station may recognize or estimate, respectively, a channel between the base station and the mobile station, and update a previous codebook with a new codebook based on a variation of the channel. In this instance, the mobile station may provide feedback information to the base station using the new codebook, and the base station may generate a transmission signal for the mobile station using the new codebook and the feedback information.Type: GrantFiled: April 24, 2009Date of Patent: July 30, 2013Assignees: Samsung Electronics Co., Ltd., Purdue Research FoundationInventors: Bruno Clerckx, Sung Jin Kim, Ki Il Kim, David J. Love, Taejoon Kim
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Patent number: 8498416Abstract: A mobile device can save time by validating a stored message, which was previously unreadable, by utilizing a related message, which can be received at a much quicker rate. In accordance with some aspects, the mobile device can save time by validating the stored message by reading a new related message and subsequently re-reading or descrambling the stored message or its CRC. The first attempt to read the message might not be successful due to a scrambling information change or due to other reasons. The reason for the failure of the first attempt to read the message may be determined based on whether a later attempt to read the message with the same or a different scrambling information is successful.Type: GrantFiled: May 5, 2008Date of Patent: July 30, 2013Assignee: QUALCOMM IncorporatedInventors: Kurt W. Otte, Ehren J. D. Van Melle
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Patent number: 8498574Abstract: Techniques for enhanced co-existence for co-located radios are described. A mobile computing device may comprise a first radio module operative to communicate wirelessly across a first link using a first set of communications channels, a second radio module operative to communicate wirelessly across a second link using a second set of communications channels, and a coordination module operative to receive information regarding operation of the first and second radio modules, and modify a communications parameter for the first or second radio module based on the received information. Other embodiments are disclosed and claimed.Type: GrantFiled: August 6, 2012Date of Patent: July 30, 2013Assignee: Palm, Inc.Inventors: James Beninghaus, Jerome Tu, Neil Hendin, William Ngo, Welly Kasten
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Publication number: 20130188758Abstract: Methods, systems, and apparatuses are provided for performing joint source channel decoding in a manner that exploits parameter domain correlation. Redundancy in speech coding and packet field parameters is exploited to generate conditional probabilities that a decoder utilizes to perform joint source channel decoding. The conditional probabilities are based upon correlations of parameters of a current frame with parameters of the same or other frames or historical parameter data. Parameter domain correlation provides significant channel decoding improvement over prior bit domain solutions. Also provided are methods, systems, and apparatuses for utilizing received statistics of monitored data bits from which conditional probabilities are generated to perform channel decoding. The techniques described may be implemented at the decoder side and thus do not interfere with transmission standards.Type: ApplicationFiled: January 24, 2013Publication date: July 25, 2013Applicant: BROADCOM CORPORATIONInventor: BROADCOM CORPORATION
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Publication number: 20130188759Abstract: Systems and methods are provided for adaptively filtering a signal. A signal is received, and the received signal is filtered to generate an output signal. A difference signal is generated based on a difference between the output signal and a reference signal, and a correlation of the received signal and the different signal is evaluated. Then, a mode is selected between a first adaptive filtering mode and a second adaptive filtering mode based at least in part on the correlation, and the received signal is filtered using the selected adaptive filtering mode.Type: ApplicationFiled: January 24, 2013Publication date: July 25, 2013Applicant: Marvell World Trade Ltd.Inventor: Marvell World Trade Ltd.
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Patent number: 8494095Abstract: The present invention relates to a method of detecting the presence of a transmission signal of a transmitter in a reception signal in a wireless communication system based on CR technology.Type: GrantFiled: September 20, 2010Date of Patent: July 23, 2013Assignee: POSTECH Academy-Industry FoundationInventors: Joon Ho Cho, Jeong Ho Yeo
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Patent number: 8494094Abstract: An apparatus and method begin creation and storage of correlation sums to be demodulated (“early-collected sums”) prior to determination of a location of a bit of data in a wireless signal relative to a local clock. Such early storage allows demodulation of these early-collected sums at a later time, specifically on determination of the data's location in the wireless signal, thereby to yield early-collected data bits. Additionally, after determination of the data bit's location in the wireless signal, additional data bits are further generated in the normal manner, by demodulating the wireless signal, thereby to yield normally-collected data bits. Use of early-collected data bits in generating navigation data reduces the time to start data demodulation, and enables fewer normally-collected data bits to be used to generate navigation data, in several aspects of the invention.Type: GrantFiled: August 2, 2010Date of Patent: July 23, 2013Assignee: QUALCOMM IncorporatedInventors: Sundar Raman, Dominic Gerard Farmer
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Patent number: 8488707Abstract: The present invention relates to a multi-antenna subsystem for a SDR (software defined radio) capable of supporting a multi-antenna technique to an antenna system using a multi-antenna subsystem. The multi-antenna subsystem of a multi-antenna system includes an algorithm executing unit for carrying out an algorithm for a multi-antenna technique to be required in the multi-antenna system, a frame synchronization unit for a synchronization acquisition, and a control unit for controlling the algorithm executing unit and the frame synchronization. The algorithm executing unit has a plurality of functional blocks and the functional block has state information, which can be referred by other functional blocks, for supporting SDR system.Type: GrantFiled: November 28, 2008Date of Patent: July 16, 2013Assignee: Intellectual Discovery Co., Ltd.Inventors: Seung-Heon Hyeon, June Kim, Seung-Won Choi
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Patent number: 8488695Abstract: A receiving apparatus for receiving an orthogonal frequency division multiplexing (OFDM) signal including a frame having one frame length of a plurality of patterns. The apparatus comprises an acquiring section to acquire information regarding a preamble signal from an OFDM signal from a transmitting apparatus; a frame determining section to determine whether the one frame length is short in the frame based on the information regarding the acquired preamble signal; and a time interpolating section to obtain transmission path characteristics by comparing a pilot contained in the preamble signal with a known pilot corresponding to the pilot in a phase of transmission, when the frame determining section determines that the one frame length is short in the frame, and to interpolate a data portion in a time direction based on transmission path characteristics.Type: GrantFiled: December 2, 2010Date of Patent: July 16, 2013Assignee: Sony CorporationInventors: Takashi Yokokawa, Tadaaki Yuba, Hidetoshi Kawauchi, Hitoshi Sakai, Yuken Goto, Suguru Houchi
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Patent number: 8488723Abstract: A timing synchronous detection device includes: a first autocorrelator that performs autocorrelation using a received signal and a first delay signal in which the received signal is delayed; a second autocorrelator that performs autocorrelation using the received signal and a second delay signal in which the received signal is delayed; an average-normalization device that obtains an average value of an output signal of the first autocorrelator and an output signal of the second autocorrelator; a comparator that compares the average value and a threshold value and that outputs, if the average value is larger than the threshold value, the average value; and a maximum value search device that searches for a maximum value of the average values that are output from the comparator.Type: GrantFiled: December 20, 2010Date of Patent: July 16, 2013Assignee: Electronics and Telecommunications Research InstituteInventor: Kyung Yeol Sohn
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Patent number: 8488722Abstract: Symbol detection and soft dempapping methods and systems are provided. Individual subset symbol detection according to an embodiment of the invention involves identifying a search subset of a transmission symbol set for a transmission symbol. For each other transmission symbol in communication signals, multiple search subsets of the transmission symbol set are identified. The multiple search subsets include respective search subsets based on each transmission symbol in either the search subset for the first identified one of the transmission symbols or each of the multiple search subsets identified for a different one of the other transmission symbols. Symbol detection errors may be detected by identifying competing symbols and computing competing distances. Soft demapping may be provided by calculating soft decision results based on detected symbols and weighting the soft decision result.Type: GrantFiled: January 26, 2012Date of Patent: July 16, 2013Assignee: Microsoft CorporationInventors: Ming Jia, Peiying Zhu, Wen Tong, Jianglei Ma
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Publication number: 20130177109Abstract: There is provided a signal detector which includes a correlation emphasis unit configured to generate correlation emphasis signals corresponding to the respective fixed intervals, an autocorrelation matrix generation unit configured to generate an autocorrelation matrix, a noise power estimation unit configured to estimate noise power in the correlation emphasis signals, a noise power matrix generation unit configured to generate, a noise power matrix having noise power components, a noise removal unit configured to remove an influence of noise from the autocorrelation matrix, an eigenvalue calculation unit configured to calculate an eigenvalue of the autocorrelation matrix from which the influence of noise has been removed by the noise removal unit, and a signal judgment unit configured to determine whether a signal transmitted from an external apparatus is included in the received signals.Type: ApplicationFiled: January 3, 2013Publication date: July 11, 2013Applicant: FUJITSU LIMITEDInventor: FUJITSU LIMITED
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Publication number: 20130177110Abstract: A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.Type: ApplicationFiled: March 1, 2013Publication date: July 11, 2013Applicant: Cisco Technology, Inc.Inventor: Cisco Technology, Inc.
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Patent number: 8483301Abstract: In one embodiment, a method to generate a set of tone frequencies within an operating frequency range for use in a timing acquisition process in a wireless communication system comprises selecting a system frequency resolution generating a set of frequency tones which are relatively prime integers with respect to the frequency resolution and within an operating frequency range of the wireless communication system. Other embodiments may be described.Type: GrantFiled: March 10, 2011Date of Patent: July 9, 2013Assignee: The Boeing CompanyInventor: Gary A. Ray
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Patent number: 8483334Abstract: Provided are an automatic gain control (AGC) apparatus using an efficient receiving structure of an impulse signal-based ultra wideband wireless communication system, and a method thereof. An AGC apparatus of an impulse signal-based wireless communication system guarantees an SNR received through an analog circuit unit, outputs correlation values with respect to an impulse preamble of the received signal, outputs the maximum value of the correlation values for each symbol among the correlation values, or divides a symbol period into a plurality of groups and obtains average values through a sum of each group to output the maximum value thereof.Type: GrantFiled: October 23, 2009Date of Patent: July 9, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Jung-yeol Oh, Min Su Kil, Jae Young Kim
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Patent number: 8483331Abstract: A reception device calculates a radio quality in a downlink by using a plurality of pilot symbols transmitted from a base station. The reception device includes a correlation calculation unit and a radio quality calculation unit. The correlation calculation unit calculates a correlation value between a first pilot symbol and a second pilot symbol on a time axis or a correlation value there between on a frequency axis. If the correlation value obtained by the correlation calculation unit exceeds a predetermined threshold value, the radio quality calculation unit calculates a radio quality in the downlink by using a reception quality of the first pilot symbol and a reception quality of the second pilot symbol.Type: GrantFiled: June 9, 2009Date of Patent: July 9, 2013Assignee: NTT DoCoMo, Inc.Inventors: Mototsugu Suzuki, Tetsurou Imai, Koushirou Kitao, Yoshihiro Ishikawa
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Patent number: 8483330Abstract: A received signal comprises a continuous sequence of symbols ?1, ?2, . . . ?n, each represented by a sequence of samples X0, X2, . . . Xn?1, and wherein the symbols have a guard period GP of duration Tgp at the beginning thereof. Each guard period contains a cyclic prefix with the same subsequence of samples as a tail end portion of the associated symbol. The symbols are identified by delaying the received signal by a fixed number of samples, computing the correlation of the received signal with the delayed signal, computing the summation of said correlation over a window of duration Ti, wherein Ti>Tgp, and sliding the window over the correlation to find a characteristic point or region. The start of each symbol for further processing is selected from the characteristic point or region. By increasing the duration of the window, more robust performance can be achieved, especially in multipath conditions.Type: GrantFiled: September 1, 2009Date of Patent: July 9, 2013Assignee: Wi-Lan Inc.Inventors: Lingjie Li, Shiquan Wu
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Patent number: 8483329Abstract: To quickly and robustly detect the presence of an incumbent user and rapidly relinquish the spectrum to the incumbent user when necessary, carrier recovery is performed in a receiver of the secondary user's cognitive or software radio prior to performing correlation detection with an upsampled reference signal to correct for large frequency offsets and improve the performance of the correlation detector. To detect a received signal, a pilot value is added to a reference signal. The reference signal is upsampled to a sampling frequency of the received signal. The upsampled reference signal is correlated with a demodulated baseband signal to produce a correlation value. It is then determined whether the received signal is present if the correlation value is greater than a predetermined detection threshold value.Type: GrantFiled: March 6, 2008Date of Patent: July 9, 2013Assignee: Koninklijke Philips N.V.Inventor: Monisha Ghosh
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Patent number: 8483642Abstract: A SAW-less receiver includes a front end module (FEM) interface module, an RF to IF section, and an IF to baseband section. The RF to IF section includes a frequency translated bandpass filter (FTBPF), an LNA, and a mixing section. The FTBPF includes a switching network and a complex baseband filter having an offset baseband filter response. The switching network is operable to frequency translate the offset baseband filter response to an RF frequency response such that the FTBPF filters the inbound RF signal by passing, substantially unattenuated, a desired RF signal component and by attenuating an image signal component and/or an undesired signal component. The LNA amplifies the filtered inbound RF signal and the mixing section mixes the amplified inbound RF signal with a local oscillation to produce an inbound IF signal. The IF to baseband section converts the inbound IF signal into an inbound symbol stream(s).Type: GrantFiled: March 24, 2011Date of Patent: July 9, 2013Assignee: Broadcom CorporationInventors: Ahmad Mirzaei, Hooman Darabi
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Publication number: 20130170590Abstract: According to embodiments herein an ambiguity problem when compensating for frequency offset may be solved by compensating a received reference symbol according to two different frequency offset hypotheses; the estimated frequency offset and the a mirrored version of the same. Then by comparing the compensated reference symbol of the different frequency hypotheses with a target reference symbol, which is known at the receiver node 12, the frequency offset hypothesis which is most likely is used to compensate a received data symbol.Type: ApplicationFiled: September 17, 2010Publication date: July 4, 2013Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Mattias Hyll, Fredrik Huss
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Publication number: 20130170589Abstract: Problems arising from a pre-emphasis filter, particularly an infinite-impulse-response filter, in a signal modulator are solved by detecting sequences of the same bit or symbol in a modulation signal and compensating the corresponding d.c. offset in the signal generated by the pre-emphasis filter without real-time feedback. The amount of offset compensation can be defined during design of the modulator or adjusted or calibrated during production. It is not necessary to change the transfer function of the pre-emphasis filter, but only to correct the d.c. offset of the filter output signal.Type: ApplicationFiled: December 20, 2012Publication date: July 4, 2013Applicant: ST-ERICSSON SAInventor: ST-Ericcson SA
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Patent number: 8477894Abstract: In accordance with the present invention, a method of processing a signal is described that includes receiving a signal having an encoded digital packet, wherein the digital packet includes packet data and a packet frame, wherein the packet frame includes a common digital signal that is common to each one of a plurality of digital packets. The method further includes sampling a signal associated with the received signal to provide a sampled signal. The method further includes performing a channel characterization by contrasting a signal representative of the sampled signal with a signal representative of the common digital signal. A corresponding system is also described.Type: GrantFiled: March 8, 2012Date of Patent: July 2, 2013Assignee: Raytheon CompanyInventors: James A. Wurzbach, Steven E. Shields, David G. Manzi
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Publication number: 20130163703Abstract: Disclosed are an apparatus and a method for detecting a broadcasting signal. The signal detecting apparatus according to the exemplary embodiment of the present invention includes: a reference signal generator outputting a reference signal acquired by performing a correlation calculation between a current sample and a previous sample of a received signal which is an FM signal or a digital radio mondiale plus (DRM+) signal and then normalizing a result of the correlation calculation; and a discriminator detecting a maximum value of the reference signal and judging that the received signal is the FM signal when the maximum value of the reference signal is more than a predetermined threshold.Type: ApplicationFiled: December 30, 2011Publication date: June 27, 2013Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTEInventors: Won Gi JEON, Kyung Taek LEE, Kyung Won PARK, Seong Jun KIM
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Patent number: 8472568Abstract: A method for communication includes receiving a communication signal conveying multiple encoded bits of an Error Correction Code (ECC). Respective N-bit soft decoding metrics are computed with respect to the bits of the ECC. A scaling factor is computed based on at least one characteristic of the N-bit soft decoding metrics and on at least one property of the received communication signal. The N-bit soft decoding metrics are scaled by the scaling factor. The scaled N-bit soft decoding metrics are quantized to produce respective K-bit metrics, K<N. The ECC is decoded using the scaled and quantized soft decoding metrics.Type: GrantFiled: August 13, 2012Date of Patent: June 25, 2013Assignee: Marvell International Ltd.Inventors: Shahar Fattal, Ronen Mayrench
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Patent number: 8472549Abstract: A User equipment selecting first user equipment in a mode of precoding transmission and second user equipment in a mode of diversity transmission; a parameter determining a modulation mode, the number of transmission layers and a precoding matrix according to channel quality information, precoding matrix information and number of transmission layers sent from the first user equipment and channel quality information and number of transmission layers sent from the second user equipment; according to the modulation mode and the number of transmission layers, generating first and second symbol sequence from first and second source data; hierarchically modulating the first and the second symbol sequence to generate a mixed symbol sequence; layer mapping and precoding for the mixed symbol sequence to generate transmission signals; and transmitting the precoding matrix and the number of transmission layers to the second user equipment; sending the transmission signals to the first and second user equipments.Type: GrantFiled: April 3, 2012Date of Patent: June 25, 2013Assignee: Fujitsu LimitedInventors: Yuantao Zhang, Jianming Wu, Jun Tian, Hua Zhou
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Patent number: 8472571Abstract: Direct detection of wireless interferers in a communication device for multiple modulation types. One or more radios implemented within a communication device is/are operative to receive and process wireless communications. A wireless communication signal is processed to extract symbols there from. Various symbols groups are processed in accordance with correlation processing to identify potential interferers (e.g., other communication devices using common portions of frequency spectra). Alternatively, matched filter processing (e.g., using a Barker matched filter in some embodiments) operates on the various symbol groups to identify some potential interferers. Various combinations of correlation processing and matched filter processing may be employed in other instances (e.g., using any of a desired means of comparison, combining, etc.) in considering interferers identified in accordance with each of these two means.Type: GrantFiled: July 23, 2012Date of Patent: June 25, 2013Assignee: Broadcom CorporationInventor: Prasanna Desai
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Patent number: 8472570Abstract: The present application discloses a number of inventions directed to method(s), apparatus and/or networks and systems adapted to track time varying channels, adapted to synchronize packets arriving at a receiver, adapted to correlate a received signal, adapted to manage digital resources, adapted to receive a signal and/or adapted to enable communication in a wireless packet based communications network.Type: GrantFiled: January 24, 2012Date of Patent: June 25, 2013Assignee: Cohda Wireless Pty Ltd.Inventors: Paul Dean Alexander, John Lawrence Buetefuer, Ivan Anthony Curtis, Wade Nicholas Farrell, Alexander James Grant, David Victor Haley, Stephen Peter Jakas, Joshua Charles Sutton
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Patent number: 8472542Abstract: Embodiments of the present invention provide a method, an apparatus, and a system for signal transmission. The method includes: obtaining, by a base station, a high-power precoding matrix and a low-power precoding matrix according to channel quality information, precoding a corresponding high-power signal stream according to the high-power precoding matrix respectively to obtain a first signal stream, precoding a corresponding low-power signal stream according to the low-power precoding matrix respectively to obtain a second signal stream, superimposing the first signal stream and the second signal stream to obtain one or more superimposed signal streams and transmitting the one or more superimposed signal streams to user terminals; decoding, by the user terminals, the received one or more superimposed signal streams by using receiving matrices, and obtaining signal streams that the user terminals need.Type: GrantFiled: September 21, 2012Date of Patent: June 25, 2013Assignee: Huawei Technologies Co., Ltd.Inventors: Rui Wang, Sheng Liu, Yinggang Du
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Patent number: 8472540Abstract: According to various embodiments, a method is disclosed that includes a method is disclosed that includes determining, by a receiver, a frequency offset in a signal comprising a set of orthogonal frequency division multiplexed (OFDM) symbols by determining a first difference in phase angles between a nth OFDM symbol and a nth+1 OFDM symbol on a common OFDM carrier and a first difference in phase angles between the nth+1 OFDM symbol and a nth+2 OFDM symbol on the common OFDM carrier and determining a second difference in phase angles between the first difference in phase angles between the nth OFDM symbol and the nth+1 OFDM system and the first difference in phase angles between the nth+1 OFDM symbol and the nth+2 OFDM symbol to identify the frequency offset, wherein n?{1, . . . , N}; and correcting, by the receiver, the signal using the determined frequency offset.Type: GrantFiled: November 30, 2010Date of Patent: June 25, 2013Assignee: Intel CorporationInventors: Sahan S. Gamage, Bernard Arambepola, Thushara Hewavithana, Parveen K. Shukla
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Patent number: 8472569Abstract: Systems and methods for fine symbol timing estimation are disclosed herein. In one embodiment, a wireless receiver includes a differential detector, a correlator, a coarse symbol timing estimator, and a fine symbol timing estimator. The differential detector is configured to detect phase differences in a received preamble signal modulated using differential phase shift keying. The correlator is configured to correlate symbol values output by the differential detector against a reference sequence. The coarse symbol timing estimator is configured to generate a coarse symbol timing estimate, and to generate a coarse timing sample symbol index value corresponding to the coarse symbol timing estimate. The fine symbol timing estimator is configured to generate a fine symbol timing estimate that is more accurate than the coarse symbol timing estimate based on the coarse timing sample symbol index value and correlation samples at index values preceding and succeeding the coarse timing sample index value.Type: GrantFiled: December 6, 2010Date of Patent: June 25, 2013Assignee: Texas Instruments IncorporatedInventors: June Chul Roh, Srinath Hosur, Timothy M. Schmidl
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Patent number: 8472504Abstract: A method for optimizing an acquisition phase of a spread-spectrum signal by a mobile receiver includes searching for a trend path having the maximum energy for different frequency assumptions and among all the positive trend paths of frequencies between initial and final instants marking the beginning and the end of a coherent signal integration.Type: GrantFiled: September 25, 2009Date of Patent: June 25, 2013Assignees: Thales, Centre National d'Etudes SpatialesInventors: Damien Kubrak, Michel Monnerat, Lionel Ries, Géraldine Artaud
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Patent number: 8467482Abstract: A method for identifying a transmitter in a digital broadcasting system includes: receiving a broadcast signal in which a TxID sequence for identification of a transmitter is embedded; correlating the received broadcast signal with a plurality of elementary code sequences of a pseudo-random sequence sequentially; and identifying the transmitter by using the correlation results.Type: GrantFiled: April 2, 2010Date of Patent: June 18, 2013Assignees: Electronics and Telecommunications Research Institute, University of Western OntarioInventors: Sung-Ik Park, Heung-Mook Kim, Md. Jahidur Rahman, Xianbin Wang
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Patent number: 8467477Abstract: A decoding system for LDPC code concatenated with 4QAM-NR code in a DTMB system is a two-stage decoding system. An NR decoder performs a 4QAM-NR decoding to obtain hard decision information. Then, the so obtained hard decision information together with corresponding soft symbol and channel state information are sent to a log-likelihood ratio (LLR) device for further computing a log-likelihood ratio after an adder adds a correction term associated with the hard decision information to a computed log-likelihood ratio without the hard decision information. An LDPC decoder receives the LLR for decoding.Type: GrantFiled: September 25, 2009Date of Patent: June 18, 2013Assignee: Sunplus Technology Co., Ltd.Inventors: Chun-Chieh Tseng, Chi-Nong Hsieh
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Patent number: 8467466Abstract: Techniques for performing detection and decoding at a receiver are described. In one scheme, the receiver obtains R received symbol streams for M data streams transmitted by a transmitter, performs receiver spatial processing on the received symbols to obtain detected symbols, performs log-likelihood ratio (LLR) computation independently for each of D best data streams, and performs LLR computation jointly for the M?D remaining data streams, where M>D?1 and M>1. The D best data streams may be selected based on SNR and/or other criteria. In another scheme, the receiver performs LLR computation independently for each of the D best data streams, performs LLR computation jointly for the M?D remaining data streams, and reduces the number of hypotheses to consider for the joint LLR computation by performing a search for candidate hypotheses using list sphere detection, Markov chain Monte Carlo, or some other search technique.Type: GrantFiled: February 1, 2006Date of Patent: June 18, 2013Assignee: QUALCOMM IncorporatedInventors: Bjorn Bjerke, Irina Medvedev, John W. Ketchum, Mark S. Wallace, Jay Rodney Walton
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Patent number: 8467462Abstract: To suppress effects produced on other terminals as much as possible, while obtaining the advantage of soft-combining. A multicarrier receiving apparatus that receives a packet comprised of at least a propagation path estimation symbol and a scrambled information symbol to demodulate, and has propagation path estimating sections 3-a and 3-b that respectively estimate propagation paths of radio signals transmitted from a plurality of transmission antennas, scramble multiplying sections 5-a and 5-b that respectively perform the same scrambling on propagation path estimation values output from the propagation path estimating sections 3-a and 3-b as scrambling provided in the information symbol on the transmission antennas sides, an adding section 3-c that adds scrambled propagation path estimation values, and a propagation path compensating section 7 that performs propagation path compensation of the information symbol included in the received packet using a signal output from the adding section 3-c.Type: GrantFiled: November 15, 2006Date of Patent: June 18, 2013Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Hamaguchi, Minoru Kubota, Shimpei To, Shoichi Shitara, Kimihiko Imamura
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Publication number: 20130148765Abstract: A coarse timing acquisition technique includes generating a sequence detection indicator. The sequence detection indicator indicates detection of a sequence of repeated symbols in a received signal. The sequence detection indicator is based on a first energy threshold and a normalized moving sum of an autocorrelation signal. The autocorrelation signal is based on the received signal.Type: ApplicationFiled: December 13, 2011Publication date: June 13, 2013Inventors: Amit Ranjan Dubey, Cimarron Mittelsteadt
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Publication number: 20130148766Abstract: In this signal detection device (100), a delaying unit (101) delays a first distributed signal or a second distributed signal distributed from a received signal for a period of time of T1 to form a first multiplication signal, and delays the one for a period of time of T2 (T2>T1) to form a second multiplication signal. An integrator (104) calculates a first correlation value by integrating the result of multiplying the first distributed signal and the first multiplication signal. An integrator (105) calculates a second correlation value by integrating the result of multiplying the second distributed signal and the second multiplication signal. An evaluation unit (108) evaluates whether the signal to be detected, which is a periodic signal with a period of T1 or a periodic signal with a period of T2, exists or not, on the basis of the first correlation value and the second correlation value.Type: ApplicationFiled: March 7, 2012Publication date: June 13, 2013Applicant: Panasonic CorporationInventors: Yoshio Urabe, Kazuhiro Ando, Masataka Irie, Hiroshi Takahashi
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Patent number: 8462833Abstract: Methods and apparatuses for acquiring a satellite signal includes generating a differential code using first, second and third segments of a satellite signal received from a positioning satellite, obtaining a correlation value by performing a correlation using the differential code and a replica of the spreading code, and acquiring the satellite signal using the correlation value. The differential code is generated by performing a differential operation on a spreading code from the positioning satellite.Type: GrantFiled: November 29, 2010Date of Patent: June 11, 2013Assignee: Seiko Epson CorporationInventors: Yoshitaka Yamagata, Norio Teruuchi