Length Coding Patents (Class 375/246)
  • Patent number: 10397828
    Abstract: A base station device includes a transmitter configured to transmit for each logical channel first data of a first type and second data of a second type, and processor circuitry configured to, be able to omit information about a data length of the second data in a MAC protocol data unit (PDU), place a medium access control (MAC) header in front of a MAC service data unit (MSDU) of the second data, and multiplex the first data and the second data.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: August 27, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Yoshiaki Ohta, Takayoshi Ode, Yoshihiro Kawasaki
  • Patent number: 10244252
    Abstract: The present invention relates to a method and apparatus for encoding/decoding image using a motion vector.According to one embodiment of the present invention, an image-decoding method is provided. The image-decoding method comprises the following steps: clipping a motion vector of a reference picture with a predetermined dynamic range so as to generate a clipped motion vector; storing the clipped motion vector in a buffer; deriving a motion vector of a block to be decoded using the motion vector stored in the buffer; and performing inter-prediction decoding using the motion vector of the block to be decoded. According to the present invention, the size of a memory space required to store a motion vector may be reduced.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: March 26, 2019
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Sung Chang Lim, Hui Yong Kim, Se Yoon Jeong, Suk Hee Cho, Dong San Jun, Jong Ho Kim, Ha Hyun Lee, Jin Ho Lee, Jin Soo Choi, Jin Woong Kim
  • Patent number: 10063354
    Abstract: A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: August 28, 2018
    Inventors: Ronny Hadani, Selim Shlomo Rakib
  • Patent number: 9973359
    Abstract: Disclosed is a cognitive radio system, resource allocation apparatus thereof and method therefor. A resource allocation apparatus comprises: a transmission opportunity assessment device which is used to assess availabilities of transmission opportunities in radio resources of a primary communication system; a vector production device which is used to set a transmission opportunity selection vector for each secondary user in the cognitive radio system based on assessment results of the availabilities of transmission opportunities, wherein the transmission opportunity selection vector includes information for identifying multiple transmission opportunities assessed available; and a sending device which is used to distribute the transmission opportunity selection vector to the secondary user.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: May 15, 2018
    Assignee: Sony Corporation
    Inventor: Xin Guo
  • Patent number: 9485060
    Abstract: Methods and systems for transmitting uplink control information and feedback are disclosed for carrier aggregation systems. A user equipment device may be configured to transmit uplink control information and other feedback for several downlink component carriers using one or more uplink component carriers. The user equipment device may be configured to transmit such data using a physical uplink control channel rather than a physical uplink shared channel. The user equipment device may be configured to determine the uplink control information and feedback data that is to be transmitted, the physical uplink control channel resources to be used to transmit the uplink control information and feedback data, and how the uplink control information and feedback data may be transmitted over the physical uplink control channel.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: November 1, 2016
    Assignee: InterDigital Patent Holdings, Inc.
    Inventors: Shahrokh Nayeb Nazar, Kyle Jung-Lin Pan, Robert L. Olesen, Ghyslain Pelletier, Marian Rudolf, Paul Marinier, Charles A. Dennean, Stephen G. Dick, Allan Y. Tsai, Christopher Cave, Changsoo Koo
  • Patent number: 9246597
    Abstract: The present disclosure allows for optical link capacity to be optimized based on transmission parameters, such as amplifier gain, link loss, optical signal-to-noise ratio. For example, optical signals at wavelengths that are susceptible to impairments, such as non-linear effects, or that are not adequately amplified by an optical amplifier, may be modulated in accordance with lower rate/less spectrally efficient modulation formats (“low rate formats”) that are more noise tolerant. On the other hand, those optical signals at wavelengths that are less susceptible to or do not incur such impairments may be modulated in accordance with highly spectrally efficient/higher rate modulation formats (“high rate formats”) that are more noise sensitive. Accordingly, a maximum or optimized capacity may be realized through appropriately choosing, for each channel, a particular modulation format and channel spacing. Such optimized capacity can be readily obtained with adaptive driver circuits.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: January 26, 2016
    Assignee: Infinera Corporation
    Inventors: Pierre Mertz, Kuang-Tsan Wu
  • Patent number: 9179190
    Abstract: There is described a method for providing a video signal to a user, comprising: sampling said video signal at a user specific sampling rate, thereby obtaining temporally organized sample amplitudes; removing a time interrelation between said temporally organized sample amplitudes, thereby obtaining sample amplitudes having no time interrelation; transmitting said sample amplitudes having no time interrelation to said user; and reconstructing said video signal by inserting a user-specific sampling interval between successive ones of said sample amplitudes, said user-specific sampling interval corresponding to said user-specific sampling rate.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: November 3, 2015
    Inventors: Colin Gavrilenco, Mathieu Therien
  • Patent number: 9047203
    Abstract: Methods and systems for encoding and decoding data using a streaming product-code (SPC). An SPC codeword has a first and second portion in a first and second component stream of the SPC, respectively. The first portion of the first codeword is arranged along a first dimension of the SPC, and the second portion of the first codeword is arranged along a second dimension of the SPC. The SPC efficiently encodes data into a desired target frame format without the overhead of dedicated mapping logic used by product-codes solutions.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: June 2, 2015
    Assignee: Altera Corporation
    Inventor: Chuck Rumbolt
  • Patent number: 9014259
    Abstract: An apparatus and method sequentially parses bitstreams based on a removal of an Emulation Prevention Byte (EPB). The apparatus and method may detect an EPB pattern from among sequentially input bitstreams, may store the bitstreams, may store a processed bitstream where the EPB pattern is removed, among the bitstreams, and may select an output of a register buffer based on an input of a buffer selection flag.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: April 21, 2015
    Assignees: Samsung Electronics Co., Ltd., Kwangwoon University Industry-Academic Collaboration Foundation
    Inventors: Donggyu Sim, Doo Hyun Kim, Joon Ho Song, Shi Hwa Lee, Do Hyung Kim, Hyun Ho Cho, Jin Sub Lee, Jeong Han Seo
  • Patent number: 8989288
    Abstract: The present disclosure relates to a method for common pilot configuration, the method comprising steps of: determining information related to UEs served by a BS; and configuring transmission of at least one common pilot from the BS to the served UEs based on the determined UE related information. In an example 4-branch MIMO system, at most 4 common pilots are configurable to be transmitted, and the at least one common pilot is two common pilots newly introduced into a legacy system.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: March 24, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Jinhua Liu, Bo Goransson, Xinyu Gu, Qingyu Miao, Zhang Zhang
  • Patent number: 8913704
    Abstract: Embodiments relate to systems and methods for reducing jitter caused by frequency modulation of a clock signal including modulating the frequency of the clock signal based on a predetermined modulation signal m(t), and compensating an accumulated jitter J(t) caused by the frequency modulation of the clock signal such that an absolute value of the accumulated jitter J(t) never exceeds a predetermined jitter limit Jlim.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: December 16, 2014
    Assignee: Infineon Technologies AG
    Inventors: Dietmar Koenig, Harald Schmid, Thomas Steinecke
  • Patent number: 8811467
    Abstract: A finite sequence of code values is formed, and can be used for example in communications or remote sensing. A code value in said finite sequence of code values has a validity period specific to that code value. There are code values of different validity periods in said finite sequence of code values. Each of said validity periods is longer than or equal to a predetermined minimum baud length.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: August 19, 2014
    Assignee: Fracticode Ltd.
    Inventor: Juha Vierinen
  • Patent number: 8774265
    Abstract: The present invention provides an encoding apparatus that executes encoding processing for input video data, including: a distributor configured to distribute the input video data into a plurality of channels on a picture basis; and a plurality of encoders configured to be provided on the plurality of channels and each execute encoding processing for video data of a corresponding one of the channels output from the distributor.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: July 8, 2014
    Assignee: Sony Corporation
    Inventor: Daisuke Tsuru
  • Patent number: 8750089
    Abstract: A method and system for iterative discrete Fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques are presented. Aspects of the method and system include a procedure for computing channel estimates in both the time domain and frequency domain (or mixed domain) using an iterative DFT method based on MMSE techniques. One aspect of the method and system may achieve low computational complexity and produce more accurate channel estimate values in low signal to noise ratio (SNR) regimes in comparison to conventional DFT-based channel estimation methods, which utilize least squares (LS) techniques. The method and system disclosed herein may be practiced in connection with a wide range of orthogonal frequency division multiplexing (OFDM) based systems, for example wireless local area networks (WLAN, for example IEEE 802.11 WLAN systems), and LTE systems.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 10, 2014
    Assignee: Broadcom Corporation
    Inventors: Sirikiat Ariyavisitakul, Jun Zheng
  • Patent number: 8737490
    Abstract: The present disclosure relates to a method for analog-to-digital converter based decision feedback equalization. The method may include providing an integrated circuit including a SerDes circuitry having a transmit circuitry and a receiver circuitry. The method may further include receiving a high-speed data stream at the receiver circuitry and converting the high-speed data stream to a digital signal using a successive approximation analog-to-digital converter. The method may also include providing the digital signal to a digital decision feedback equalization circuitry via the successive approximation analog-to-digital converter.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: May 27, 2014
    Assignee: Cadence Design Systems, Inc.
    Inventors: Thomas Evan Wilson, Eric Harris Naviasky
  • Patent number: 8737491
    Abstract: The present disclosure relates to a method for Analog-to-Digital Converter Based Decision Feedback Equalization. The method may include providing an integrated circuit including a SERDES circuitry having a transmit circuitry and a receiver circuitry and receiving a high-speed data stream at the receiver circuitry. The method may also include converting the high-speed data stream to a digital signal using a successive approximation analog-to-digital converter and providing the digital signal to a digital decision feedback equalization circuitry via the successive approximation analog-to-digital converter. The method may also include generating an output signal at a phase locked loop and receiving the output signal at a multi-loop clock and data recovery circuitry.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: May 27, 2014
    Assignee: Cadence Design Systems, Inc.
    Inventors: Thomas Evan Wilson, Eric Harris Naviasky
  • Patent number: 8705588
    Abstract: Systems and methods for improving the performance of direct-sequence spread-spectrum communication systems. In one embodiment, a system comprises at least one communication channel that utilizes two different orthogonal spreading codes and corresponding portions of the available orthogonal code space. Portions of the data processed by the communication channel are demultiplexed into different streams and covered with corresponding, different orthogonal spreading codes. The streams covered by the different orthogonal codes are then combined and transmitted via the same communication channel. One embodiment utilizes at least two different Walsh codes of different lengths (+? and ++??) in order to make use of the three quarters of the Walsh space not utilized by low-rate legacy channels.
    Type: Grant
    Filed: February 20, 2004
    Date of Patent: April 22, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Joseph P. Odenwalder
  • Patent number: 8675646
    Abstract: A method for encoding an information object in a communication system by storing the information object in a buffer; generating a sampling set including bits randomly selected from the buffer and bits regularly selected from the buffer; generating control channel data including a sampling set number of the sampling set and size information for the information object; and modulating the sampling set and the control channel data.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: March 18, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hee-Won Jung, Jun-Ho Koh, Sang-Mook Lee, Gi-Sang Lee, Sergey Zhidkov
  • Patent number: 8615045
    Abstract: A method and an apparatus for playout scheduling in a Voice over Internet Protocol (VoIP) system are provided. The method includes acquiring Pulse Code Modulation (PCM) samples by decoding a received packet; setting a first scale ratio according to a length of PCM samples stored in a playout buffer based on a preset scale ratio table; setting a second scale ratio by predicting a packet delay; setting a final scale ratio using the first scale ratio and the second scale ratio; and adjusting the length of the acquired PCM samples at the final scale ratio.
    Type: Grant
    Filed: October 22, 2008
    Date of Patent: December 24, 2013
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Hee-Jin Oh, Hae-Taek Jung, Austin Kim, Jae-Bum Kim, Min-Sung Kim
  • Patent number: 8594205
    Abstract: A method and apparatus reliably encode and decode information over a communication system. The method includes transforming two coefficients into two pairs of random variables, one random variable in each pair having substantially equal energy as one random variable in the other pair. The method further includes quantizing each of the pairs of random variables and entropy coding each quantized random variable separately creating an encoded bitstreams. The encoded bitstreams are received by a decoder which first determines which channels of the communication system are working. The encoded bitstream is entropy decoded, inversed quantized and inversed transformed. An inverse transform performs three different transformations depending upon which channels are working, i.e., whether the first, second or both channels are working.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: November 26, 2013
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Hamid Jafarkhani, Michael T. Orchard, Amy R. Reibman, Yao Wang
  • Patent number: 8582624
    Abstract: A set of channelization codes to be monitored is divided into two groups. The first group includes those codes for which an associated symbol modulation and transmit-diversity scheme is known. In the second group are those codes that are characterized by an unknown symbol modulation or unknown transmit-diversity scheme. The quality of the transmission of each code is then evaluated, using a metric. The metric in turn is used to determine whether the code should be used in estimating the covariance matrix by correlating the RAKE data corresponding to the code (i.e., by computing a correlation matrix for the code) or by first subtracting the channel estimates from the channel samples before correlation (i.e., by computing a covariance matrix for the code). An impairment covariance matrix is computed from the covariance matrices and correlation matrices so computed.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: November 12, 2013
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Elias Jonsson, Yoshitaka Murata, Jaroslaw Niewczas, Amit Singh, Kazuyoshi Uesaka
  • Patent number: 8542753
    Abstract: Techniques are provided for detecting a coded signal in the presence of interference. In an embodiment, a primary transmitter corresponds to a desired transmitter, and one or more secondary transmitters correspond to interfering transmitters. Received symbols, which include interference and additive noise, are filtered to recover a set of original message bits. An estimate of the set of original message bits may be determined using an ordered successive interference cancellation (SIC) decoder that uses either a SIC detector or an AWGN-based detector, depending on the signal-to-interference ratio at a primary receiver.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: September 24, 2013
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Hui-Ling Lou
  • Patent number: 8532220
    Abstract: Methods and apparatus are provided for secure distribution and storage of data using N channels. An input data sequence, X, is distributed using a plurality, N, of channels. In one embodiment, the input data sequence, X, is split into N subsequences; and the N subsequences are encoded into N bit streams using a set of Slepian-Wolf codes with N separate encoders and a joint decoder. The Slepian-Wolf codes can be selected to ensure a computational complexity to obtain a portion of the input data sequence grows exponentially with respect to a length of the input data sequence unless all of the N bit streams are compromised. In another embodiment, the input data sequence, X, is compressed using a lossless data compressing techniques; and the compressed input data sequence is split into N subsequences that are distributed.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: September 10, 2013
    Assignee: International Business Machines Corporation
    Inventors: Ligang Lu, Ashish Jagmohan, Dake He
  • Patent number: 8464081
    Abstract: A system and method for communicating information using Layer 1 from a powered device to power source equipment via Ethernet. In one embodiment, Layer 1 information such as power management, classification, temperature, and disconnect information is transmitted from a powered device to power source equipment using an AC signal that has a cycle defining a first time period during which the AC signal is turned on and a second time period during which the AC signal is turned off. A type of information being sent by the powered device can be determined based on characteristic on/off times of the AC signal cycle.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: June 11, 2013
    Assignee: Broadcom Corporation
    Inventors: Asif Hussain, Manisha Pandya
  • Patent number: 8462857
    Abstract: In a method for decoding digital information, a bit-stream signal comprising binary information is received at a digital receiver utilizing wired communication. The received bit-stream signal is sampled for each binary value at least two different sampling points within an eye pattern associated with the related binary value in order to obtain a hard-bit value for each sampling point. A single soft-bit value for each binary value based on the hard-bit values of the relevant binary value is generated and the bit value of the binary value is determined by subjecting the soft-bit values to a soft-decision algorithm.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: June 11, 2013
    Assignee: Nokia Siemens Networks GmbH & Co. KG
    Inventor: Christoph Werner
  • Patent number: 8315292
    Abstract: A communication apparatus according to the present invention comprises a transmitter for generating and transmitting a data signal where data is superposed as time length of a pulse interval, and a receiver for receiving the data signal. The transmitter and the receiver are connected through a single communication line. The receiver comprises: a receiver-side oscillator circuit for oscillating a reference pulse as a count reference of the data signal; a counter circuit for counting a pulse interval of the received data signal by converting it to a reference pulse number of the oscillator circuit; and a comparator circuit stores a first reference value therein, and judges data of the data signal by comparing the pulse interval of the data signal counted by the counter circuit with the first reference value.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: November 20, 2012
    Assignee: Panasonic Corporation
    Inventors: Hirofumi Wada, Naoto Kii
  • Patent number: 8311167
    Abstract: Example embodiments are directed to a method for detection and avoidance (DAA) of an ultra wide band (UWB) signal and a UWB terminal. The method includes: shifting a data signal by a desired frequency in a first direction; filtering the shifted data signal through a notch filter; and shifting the filtered data signal by the desired frequency in a second direction, the second direction being opposite to the first direction. The UWB terminal comprises an encoder for encoding data signals; a tone nulling unit for changing at least one tone of the plurality of tones into a null tone; an inverted fast Fourier transformer; a low pass filter for filtering the inverted fast Fourier transformed data signals; a filter circuit for attenuating an intensity of the low pass filtered signal; and a radio frequency (RF) circuit for transmitting the filtered signal.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: November 13, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jeong-Sang Lee, Jae-Ho Roh
  • Patent number: 8254435
    Abstract: A variable delay circuit delays a carrier signal having a predetermined frequency, and outputs a modulated signal. A delay setting unit sets a delay period for the variable delay circuit according to a data signal to be modulated. The delay setting unit assigns each symbol in the data signal to any one of positive edges and negative edges in the carrier signal, and sets a delay period for the variable delay circuit at the timing at which a positive edge in the carrier signal passes through the variable delay circuit, according to the symbol value in the data signal assigned to the positive edge. Furthermore, the delay setting unit sets a delay period for the variable delay circuit at the timing at which a negative edge in the carrier signal passes through the variable delay circuit, according to the symbol value in the data signal assigned to the negative edge.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: August 28, 2012
    Assignee: Advantest Corporation
    Inventor: Shoji Kojima
  • Patent number: 8160163
    Abstract: Spectrum sensing is one of the most challenging problems in cognitive radio systems. The spectrum of interest needs to be characterized and unused frequencies should be identified for possible exploitation in a simple and fast way, allowing the radio to catch up with the changing transmission parameters. A sensing method is presented where primary users are identified by matching the features extracted from the received signal to the a priori information about primary users' transmission characteristics. For estimation of some signal parameters, the cyclostationarity of the transmission spectrum is explored by using a suboptimal maximum likelihood (ML) estimator. The proposed algorithms can be used in cognitive radio for identifying various transmissions and for electronic surveillance.
    Type: Grant
    Filed: August 6, 2008
    Date of Patent: April 17, 2012
    Assignee: University of South Florida
    Inventors: Tevfik Yucek, Huseyin Arslan
  • Patent number: 8036282
    Abstract: A multi-tiered CSI vector quantizer (VQ) is provided for time-correlated channels. The VQ operates by quantizing channel state information by reference to both the current channel state information and a prior channel state quantization. A system is also provided that uses multi-tiered CSI quantizers. Enhanced signaling between the transmitter and receivers is provided in order to facilitate the use of multi-tiered CSI quantizers.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: October 11, 2011
    Assignee: Wi-LAN Inc.
    Inventors: Bartosz Mielezarek, Witold Krzymien
  • Patent number: 7991040
    Abstract: Methods and apparatus for reduction of a peak to average ratio for an OFDM transmit signal. In an aspect, a method is provided for reducing a peak to average ratio of a transmit waveform. The method includes obtaining a primary scrambler sequence, generating a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining the primary and secondary scrambler sequences to produce a PAR reduction sequence. In another aspect, an apparatus is provided for reducing a peak to average ratio of a transmit waveform. The apparatus includes a secondary generator configured to generate a secondary scrambler sequence having a length characteristic based on data to be scrambled, and combining logic configured to combine a primary scrambler sequence and the secondary scrambler sequences to produce a PAR reduction sequence.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: August 2, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Durk L. van Veen, Fuyun Ling, Raghuraman Krishnamoorthi
  • Patent number: 7920622
    Abstract: A digital broadcasting transmitter, a turbo stream processing method thereof, and a digital broadcasting system having the same. The digital broadcasting transmitter includes a first compressor, forming a normal stream by compressing audio and video signals in a first compression format, a second compressor, forming a turbo stream by compressing the audio and video signals in a second compression format, a transport stream (TS) constructor, compressing the turbo stream in an H.264 format and forming the dual transfer stream by multiplexing the normal stream and the turbo stream, and a TS processor, robustly processing the dual transfer stream transmitted from the TS constructor, thus enhancing the transmission efficiency.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: April 5, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dong-il Song, Hae-joo Jeong, Jung-pil Yu
  • Patent number: 7907069
    Abstract: A method and system allows for fast compression and decompressing of data using existing repetitive interleaved patterns within scientific data (floating point, integer, and image). An advantage of the method and system is that it is so fast that it can be used to save time due to a lower amount of data transferred/stored in scenarios like network transfer, disk or memory storage, cache storage or any other real-time applications where time plays a crucial role.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: March 15, 2011
    Assignee: Violin Memory, Inc.
    Inventor: Matthias Oberdorfer
  • Patent number: 7893852
    Abstract: Compression of signal samples output from a parallel, time-interleaved analog to digital converter (TIADC) for a baseband signal, includes calculating first or higher order differences of consecutive signal samples followed by lossless or lossy encoding of the difference samples to produce compressed samples. Compression of a TIADC output signal with a nonzero center frequency, includes calculating sums or differences of pairs of signal samples separated by an appropriate number of sampling intervals followed by lossless or lossy encoding. The sums or differences of the signal samples have lower magnitudes than the original samples, allowing more efficient compression. Lossy compression alternatives produce compressed data with a fixed bit rate or with a fixed quality in the decompressed samples.
    Type: Grant
    Filed: April 23, 2009
    Date of Patent: February 22, 2011
    Assignee: Samplify Systems, Inc.
    Inventor: Albert W. Wegener
  • Patent number: 7859443
    Abstract: A sigma-delta converter comprises a sigma-delta modulator (SDM) with a signal processing block (SP) and a quantizer (QNT), as well as a stage adaptation element (DCC). The signal processing block (SP) is designed for deriving a modulated signal (MOD) in dependence on the respective signals at a signal input (SIN) and at a feedback input (FIN). The quantizer (QNT) comprises a quantization input (QIN) that is coupled to the signal output (SOT) and a quantization output (QOT) that is coupled to the feedback input (FIN), wherein the quantizer is designed for deriving a first quantized signal (Q1) from the modulated signal (MOD) by quantization with a first number of stages and for outputting this first quantized signal at the quantization output (QOT).
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: December 28, 2010
    Assignee: austramicrosystems AG
    Inventor: Matthias Steiner
  • Patent number: 7814342
    Abstract: A system and method for communicating information using Layer 1 from a powered device to power source equipment via Ethernet. In one embodiment, Layer 1 information such as power management, classification, temperature, and disconnect information is transmitted from a powered device to power source equipment using an AC signal that has a cycle defining a first time period during which the AC signal is turned on and a second time period during which the AC signal is turned off. A type of information being sent by the powered device can be determined based on characteristic on/off times of the AC signal cycle.
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: October 12, 2010
    Assignee: Broadom Corporation
    Inventors: Asif Hussain, Manisha Pandya
  • Patent number: 7738408
    Abstract: A transceiver in a full duplex communication system includes a hybrid circuit for transmitting a transmission signal or receiving a receive signal via the channel, the hybrid circuit includes an echo cancellation device for removing transmission signal components from the receive signal; wherein the hybrid circuit outputs a processed receive signal; and a gain amplifier being an OP-RC AGC is directly connected to the hybrid circuit for amplifying the processed receive signal, wherein a first node of the gain amplifier coupled to the echo cancellation device is a virtual ground.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: June 15, 2010
    Assignee: Realtek Semiconductor Corp.
    Inventors: Pao-Cheng Chiu, Chen-Chih Huang
  • Patent number: 7719442
    Abstract: A multi-mode multi-parallelism data exchange method and the device thereof are proposed to apply to a check node operator or a bit node operator. The proposed method comprises the steps of: duplicating part or all of an original shift data as a duplicated shift data; combining the original shift data and the duplicated shift data to form a data block; and using a data block as the unit to shift this data block so as to conveniently retrieve shift data from the shifted data block. With a maximum z factor circuit and duplication of part of data, specifications of different shift sizes can be supported. The functions of shifters of several sizes can therefore be accomplished with the minimum complexity.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: May 18, 2010
    Assignee: National Chiao Tung University
    Inventors: Chih-Hao Liu, Chien-Ching Lin, Chen-Yi Lee, Hsie-Chia Chang, Yarsun Hsu
  • Patent number: 7710913
    Abstract: The present invention relates to a system and method for extending the coverage area and communication capacity of a spread-spectrum based wireless network through the use of intelligent repeaters. The system comprises a wireless communication network augmented with low cost channel selective repeaters that is capable of repeating only desired signals, thereby suppressing undesirable interference and increasing network capacity. The repeaters can be integrated into an existing wireless network with minimal impact to the existing network layer topology or control structure.
    Type: Grant
    Filed: November 28, 2005
    Date of Patent: May 4, 2010
    Assignee: Science Applications International Corporation
    Inventors: Daniel B. Kilfoyle, Travis H. Slocumb, III, Steven Carson
  • Patent number: 7697466
    Abstract: At a base station apparatus, known pilot signals for use in channel estimation are transmitted, and in addition thereto MCS pilot signals that are used to perform adaptive modulations respectively corresponding to a plurality of modulation schemes are multiplexed and output. A mobile station apparatus dispreads the respective MCS signals out of the multiplex signal, compares these to known symbols patterns, and sends the MCS pilot signals that show a matching relationship to the base station apparatus as a mobile station reception result. Upon receiving the mobile station reception result from the mobile station apparatus, the base station apparatus selects the modulation scheme of the optimum modulation level for the downlink signals. This configuration makes it possible to switch the modulation schemes in an accurate and simple way.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: April 13, 2010
    Assignee: Panasonic Corporation
    Inventors: Kazunari Hashimoto, Sadaki Futagi, Kenichi Miyoshi
  • Patent number: 7668224
    Abstract: Transceiver circuitry for use in a multiple-input, multiple-output (MIMO), orthogonal frequency-division multiplexing (OFDM), communications environment, is disclosed. Error correction coding according to a fixed-block size code, such as low density parity check (LDPC) coding, is implemented. The codeword length, and codeword arrangement, are selected by determining a minimum number of OFDM symbol periods required for a payload size, and the number of available information bits in those symbol periods. A rule-based approach, for example in a table, is used to select the codeword length, and the number of codewords required. Shortening is then applied to the code, followed by determining whether puncturing or repeating of bits is necessary to efficiently use the available OFDM symbols.
    Type: Grant
    Filed: August 16, 2006
    Date of Patent: February 23, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Dale E. Hocevar, Anuj Batra
  • Patent number: 7639757
    Abstract: A pulse modulator has a subtraction stage that produces a control error signal from the difference between a complex input signal and a feedback signal. A signal conversion stage converts the control error signal to a control signal. The control signal is multiplied by a complex mixing signal at the frequency ?0 in a first multiplication stage. At least one of the real and imaginary parts of the up-mixed control signal is then quantized by a quantization stage to produce a real pulsed signal. The pulsed signal is then employed to produce the feedback signal for the subtraction stage in a feedback unit. The pulse modulator according to the invention allows the range of reduced quantization noise to be shifted toward a desired operating frequency ?0.
    Type: Grant
    Filed: May 6, 2004
    Date of Patent: December 29, 2009
    Assignee: LITEF GmbH
    Inventor: Guenter Spahlinger
  • Patent number: 7630447
    Abstract: The invention relates to a system and a method of digital communication between synchronized submarine devices, system including means of sending a signal in modulated bit form, at least one sender (100) and at least one receiver (200), characterized in that said at least one sender (100) sends a signal enabling both any data to be transmitted to said at least one receiver (200) and a propagation time between said at least one sender (100) and said at least one receiver (200) to be measured.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: December 8, 2009
    Assignee: Sercel
    Inventors: Gérard Ayela, Christophe L'her
  • Patent number: 7616701
    Abstract: ZEB (zero excess bandwidth) modulation. The modulation rate of a signal is increased to the entirety of a communication channel's available bandwidth. Spectral zeroes at the edges of the available bandwidth now coincide with spectral zeroes at the edges of the Nyquist band and lead to ISI (intersymbol interference), which cannot be eliminated by equalization. Thus, in a ZEB system intersymbol interference (ISI) is intentionally allowed and dealt with by the known technique of TH (Tomlinson-Harashima) precoding. Comparison of conventional zero-ISI systems with ZEB systems, both exhibiting identical transmit spectra with finite spectral roll offs towards the edges of the available bandwidth, illustrate significant gains in channel throughput achievable by the ZEB systems. Similar gains can hardly be achieved by more sophisticated channel coding for zero-ISI systems. For ZEB systems an effective spectral shaping involving a simple infinite impulse response (IIR) of the overall channel is proposed.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: November 10, 2009
    Assignee: Broadcom Corporation
    Inventor: Gottfried Ungerboeck
  • Patent number: 7562021
    Abstract: Coding of spectral data by representing certain portions of the spectral data as a scaled version of a code-vector, where the code-vector is chosen from either a fixed predetermined codebook or a codebook taken from a baseband. Various optional features are described for modifying the code-vectors in the codebook according to some rules which allow the code-vector to better represent the data they are modeling. The code-vector modification comprises a linear or non-linear transform of one or more code-vectors, such as, by exponentiation, negation, reversing, or combining elements from plural code-vectors.
    Type: Grant
    Filed: July 15, 2005
    Date of Patent: July 14, 2009
    Assignee: Microsoft Corporation
    Inventors: Sanjeev Mehrotra, Wei-Ge Chen, Kazuhito Koishida
  • Patent number: 7526010
    Abstract: A composite code is made for example by exclusive-OR'ing each real element of a first constituent code A with each element of a second constituent code B to obtain a basic composite code. To suppress autocorrelation, differing numbers of doping code elements are inserted between code segments made from combining each element of code A with an element of code B. A matched filter first stage removes from its input the A code and any doping code added to it, summing the elements of code A. A matched filter second stage removes from its input the B code and any doping code added at the second level. The summed elements of code B are the input to the first stage. Optionally, the summed elements of the doping code at any level may be delayed and summed with the elements of the A code in the first stage.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: April 28, 2009
    Assignee: L-3 Communications Corporation
    Inventors: Johnny M. Harris, Samuel C. Kingston, Thomas R. Giallorenzi, Dan M. Griffin, David W. Thorson, Richard B. Ertel
  • Patent number: 7489755
    Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.
    Type: Grant
    Filed: February 9, 2005
    Date of Patent: February 10, 2009
    Assignee: Motorola, Inc.
    Inventors: Fan Wang, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
  • Patent number: 7477921
    Abstract: Substantial improvements in frequency reuse in microwave communications systems is achieved by canceling co-channel interference and transmitter leakage. Interferometric beam-narrowing reduces beamwidth without reducing peak magnitude of the beam pattern. Frequency-dependent beam-shaping compensates for frequency-dependent distortions of the beam pattern thereby improving bandwidth. A spatial demultiplexing technique utilizes spatial gain distributions of received signals to separate signals, even from co-located transmit sources, and uses microwave lensing to enhance received spatial gain distributions. Predetermined cross-polarization interference is used to separate differently-polarized receive signals. A reference branch provides a cancellation signal to a receiver to cancel transmitter leakage signals. An error signal controls an impedance-compensation circuit that is responsive to changes in antenna impedance but not to receive signals.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: January 13, 2009
    Assignee: Lot 42 Acquisition Foundation, LLC
    Inventor: Steve J. Shattil
  • Patent number: 7391814
    Abstract: An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses an analog to digital conversion method that increases the number of effective ADC bits by compressing the baseband input analog signal using a logarithmic circuit. After the compressed analog signal is converted into a digital signal, a digital anti-log process or look-up table (LUT) is used to expand the digital signal back to the original linear scale. The word size of the output of the anti-log process is larger than the input word size due to the nature of the anti-log function. To reduce the word size of the digital signal an open loop normalization technique can be applied.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: June 24, 2008
    Assignee: InterDigital Technology Corporation
    Inventors: Leonid Kazakevich, Rui Yang
  • Patent number: 7369615
    Abstract: A soft demodulation method and apparatus including calculating partial sums for a unit of each predetermined number of bits of a codeword received from a channel; calculating a value of each entry of the decoding table by referring to the partial sums; and detecting a maximum among values of all entries of the decoding table and calculating a log-likelihood ratio (LLR) using the detected maximum. Accordingly, it is possible to reduce the amount of computation required to perform a soft demodulation process using run-length limited (RLL) codes and to simplify the soft demodulation process.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: May 6, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-hyu Han, Ki-hyun Kim, In-sik Park, Yoon-woo Lee