Patents Issued in December 25, 2008
  • Publication number: 20080317135
    Abstract: The invention concerns a method for reducing the size of raw or previously compressed data of a digital file from an audio and/or video source. It comprises an operational sequence including a step of desynchronizing original reading criteria of the file, said step involving the compression and the compacting of preserved data and a step of resynchronizing the desynchronized file enabling it to be viewed and/or read based on its original criteria of resolution and duration.
    Type: Application
    Filed: July 23, 2004
    Publication date: December 25, 2008
    Inventor: Pascale epouse Gervais Loiseau
  • Publication number: 20080317136
    Abstract: A transcoder capable of efficiently utilizing a large-capacity storage medium, of efficiently coping with diverse and complex standards, and of reducing power consumption has been described. To the transcoder, first format image data encoded in a first format is input and the transcoder outputs the first format image data and second format image data encoded in a second format different from the first format, wherein the transcoder comprises an interface with a storage device and a storage device control part that controls the storing and reading in the storage device via the interface and simultaneously stores the image data of the first and second formats of the same image in the storage device via the interface.
    Type: Application
    Filed: April 29, 2008
    Publication date: December 25, 2008
    Applicant: FUJITSU LIMITED
    Inventors: Mitsuaki HINO, Kazuyuki Tanaka
  • Publication number: 20080317137
    Abstract: A method and apparatus for error concealment in image data including a block having an error, the method including: dividing a region that surrounds the block into a plurality of neighboring regions; separately calculating edge angles of the neighboring regions; and selectively performing directional interpolation based on the calculated edge angles.
    Type: Application
    Filed: March 18, 2008
    Publication date: December 25, 2008
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Seung-Woo Shin, Se-an Kwon
  • Publication number: 20080317138
    Abstract: Described herein are embodiments for decoding and displaying video data. Several of these embodiments utilize a unified frame buffer management system, to facilitate better memory management in decoding and displaying compressed video. One approach describes a method of decoding and displaying compressed video data. The method involves receiving a compressed video frame, and allocating a frame buffer for use in decoding the compressed video frame. A frame identifier is assigned to the allocated frame buffer. The compressed video frame is decoded into the frame buffer, and the frame identifier is passed to a display module.
    Type: Application
    Filed: June 20, 2007
    Publication date: December 25, 2008
    Inventor: Wei Jia
  • Publication number: 20080317139
    Abstract: A moving picture coding apparatus is provided, which controls coding of a following stream, according to virtual buffer occupancy determined by a generated amount of coded data and an amount of coded data which is transferred to an output destination, when generating the following stream so that a preceding stream and the following stream, in each of which an image stream and other information are multiplexed, are reproduced seamlessly. The moving picture coding apparatus determines an initial value of the virtual buffer occupancy for the following stream, using an amount of delay resulting from multiplexing, in addition to virtual buffer occupancy at an end of the preceding stream.
    Type: Application
    Filed: June 11, 2008
    Publication date: December 25, 2008
    Inventor: Hiroshi ARAKAWA
  • Publication number: 20080317140
    Abstract: This ID proposes synchronization patterns for RLL codes with a (repeated) minimum transition run (RMTR) constraint, where the synchronization pattern comprises a synchronization pattern-body that contains a characteristic bit-pattern that represents a violation of the RMTR constraint. Using a violation of the RMTR constraint allows for short synchronization patterns.
    Type: Application
    Filed: September 12, 2005
    Publication date: December 25, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Willem Marie Julia Marcel Coene, Andries Pieter Hekstra, Alexander Padiy
  • Publication number: 20080317141
    Abstract: The present application describes a method for transmitting data through a MIMO-OFDM system which requires the computation of a function f(H(sk)), where H is the channel matrix and sk=exp(j*2*pi*k/N). The method splits function f into a first, nonpolynomial part, which is in turn a function of one or more polynomial functions in sk.
    Type: Application
    Filed: November 7, 2005
    Publication date: December 25, 2008
    Inventors: Andreas Burg, Helmut Bolcskei, Moritz Borgmann, Davide Cescato, Jan Hansen
  • Publication number: 20080317142
    Abstract: A system and method for frequency diversity uses interleaving in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM) with various FFT sizes. Subcarriers of one or more interlaces are interleaved in a bit reversal fashion and the one or more interlaces are interleaved in the bit reversal fashion.
    Type: Application
    Filed: October 30, 2007
    Publication date: December 25, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventors: Michael Mao Wang, Fuyun Ling, Murali Ramaswamy Chari, Rajiv Vijayan
  • Publication number: 20080317143
    Abstract: Provided is an iterative residual frequency and phase compensation apparatus for an OFDM system and a method thereof. The apparatus includes: a first classifying unit for classifying symbol sequences by each subcarrier wave; a soft-decision calculating unit for calculating a soft-decision value of a data symbol using a soft-decision reliability obtained from iterative decoding performed by the iterative decoder; a classifying unit for classifying the soft-decision values by a carrier wave; a frequency estimating unit for estimating a residual frequency error of each carrier wave using the soft-decision value; a phase estimating unit for estimating an average residual phase error using the soft-decision value; a frequency and phase compensating unit for compensating frequencies and phases for input symbols of each carrier wave using the estimated frequency error and the estimated phase error; and a buffer for temporally storing the compensated symbols to provide it to the first classifying unit.
    Type: Application
    Filed: December 7, 2006
    Publication date: December 25, 2008
    Inventors: Sun-Heui Ryoo, Kwon-Hue Choi, Do-Seob Ahn
  • Publication number: 20080317144
    Abstract: The present invention discloses a method for improving paging speed of a called user in CDMA trunking system. For a first trunking terminal supporting minus time slot call manner, said method includes: it makes minus time slot paging cycles of the first trunking terminal and a trunking core network keep synchronous; the first trunking terminal selects a minus time slot paging cycle to calculate a paging time slot according to the presence of its own minus time slot paging cycle and the presence of a minus time slot paging cycle contained in an overhead message of a call channel, and monitors the call channel on the calculated paging time slot; the base station system selects a minus time slot paging cycle to calculate a paging time slot of the user according to the presence of its own minus time slot paging cycle and the presence of a minus time slot paging cycle contained in a paging request message, and transmits a paging message on the call channel according to the calculated paging time slot.
    Type: Application
    Filed: December 26, 2005
    Publication date: December 25, 2008
    Applicant: ZTE Corporation
    Inventors: Chi Huang, Mengjiao Ding, Jinlong Liu
  • Publication number: 20080317145
    Abstract: A Multiple-Input Multiple-Output (MIMO) communication system and a method of adaptively generating a codebook are provided. A terminal includes a channel estimator to estimate a channel formed between a base station and the terminal to calculate a channel matrix and a codebook generator to adaptively generate a codebook based on a spatial correlation matrix of the channel matrix.
    Type: Application
    Filed: June 9, 2008
    Publication date: December 25, 2008
    Inventors: Bruno CLERCKX, Ki Il KIM, Jun Mo KIM, Sung Jin KIM
  • Publication number: 20080317146
    Abstract: An interleaving and deinterleaving apparatus and method in a wireless communication system are provided, in which it is determined whether coded bits to be transmitted in one modulation symbol are selected from a plurality of code blocks. The coded bits are interleaved on a modulation symbol basis if the coded bits to be transmitted in the modulation symbol are selected from a plurality of code blocks.
    Type: Application
    Filed: June 20, 2008
    Publication date: December 25, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hwan-Joon KWON, Jae-Chon Yu, Jin-Kyu Han
  • Publication number: 20080317147
    Abstract: A method for transmitting scattered pilot signals in a multi-carrier system is disclosed. The method includes: in each time slot, in time dimension, putting each 4 OFDM symbols into a group according to the order of the OFDM symbols; in each group of OFDM symbols, in frequency dimension, selecting, for each OFDM symbol, a plurality of valid sub-carriers to transmit scattered pilots, wherein for a same OFDM symbol, between each 2 valid sub-carriers selected, there are 7 valid sub-carriers; for different OFDM symbols in a same group, the valid sub-carriers selected are interleaving in frequency domain; and transmitting scattered pilot signals on the valid sub-carriers selected. The solution helps the multi-carrier system to handle multi-path channel with large delay spread, to obtain more accurate channel estimation and to achieve better receiving performance.
    Type: Application
    Filed: June 25, 2008
    Publication date: December 25, 2008
    Inventors: Hui ZHANG, Liangchuan Kang, Fei Meng, Jiongliang Li
  • Publication number: 20080317148
    Abstract: The invention performs orthogonal frequency division multiplex processing on a transmission signal to form an OFDM modulation signal (daubed in FIG.) and performs orthogonal frequency division multiplex processing and code division multiple access processing on a transmission signal to form an OFDM-CDM modulation signal (shaded in FIG.) to transmit the OFDM modulation signal and the OFDM-CDM modulation signal, which makes it possible to transmit data in a very high rate using the OFDM modulation signal while making it possible to transmit data in a higher quality using the OFDM-CDM modulation signal than using the OFDM-modulation signal, although it is slightly inferior to OFDM modulation in terms of high rate transmission.
    Type: Application
    Filed: July 18, 2008
    Publication date: December 25, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Yutaka MURAKAMI, Shinichiro TAKABAYASHI, Masayuki ORIHASHI, Akihiko MATSUOKA
  • Publication number: 20080317149
    Abstract: Each of a plurality of multicarrier wireless communication devices generate a carrier frequency offset (CFO) estimate from a downlink polling frame (302) and apply the CFO estimate to signals prior to transmission to a receiving station over a multi-user uplink.
    Type: Application
    Filed: August 12, 2008
    Publication date: December 25, 2008
    Inventors: Lakshmipathi Sondur, Keith A. Holt, Ashim Biswas
  • Publication number: 20080317150
    Abstract: The present invention relates to improved multiple access communications. In one form, the invention relates to an improved signal processing method and apparatus for an iterative method of determining the reception of a signal in a multi user packet based wireless OFDM (Orthogonal Frequency Division Multiplexing) communication system. In other forms the present invention provides recursive filtering for joint iterative decoding in a variety of systems and functions such as linear multiple access channel decoders, iterative equalisation, iterative joint channel estimation and detection/decoding, iterative space-time processing, iterative multi user interference cancellation and iterative demodulation.
    Type: Application
    Filed: August 21, 2008
    Publication date: December 25, 2008
    Applicants: UNIVERSITY OF SOUTH AUSTRALIA, COHDA WIRELESS PTY. LTD.
    Inventors: Paul Dean Alexander, Alexander James Grant, Lars Kildehoj Rasmussen, Stephen Peter Jakas
  • Publication number: 20080317151
    Abstract: A method for forming a subchannel in a communication system where a first communication system and a second communication system coexist. The method includes determining a first tile set by arranging first tiles remaining after forming at least one first subchannel for the first communication system among frequency resources, including a plurality of tiles, available for the first communication system; determining a second tile set by inserting second tiles which are independent of the frequency resources and are available for the second communication system into the determined first tile set at predetermined positions; forming at least one second subchannel for the second communication system by selecting a predetermined number of tiles from the second tile set; and performing communication using at least one of the first subchannel and the second subchannel.
    Type: Application
    Filed: June 18, 2008
    Publication date: December 25, 2008
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Chi-Woo Lim, Tae-Young Kim, Ho-Kyu Choi, Jae-Weon Cho, Hyeon-Woo Lee, Dong-Seek Park
  • Publication number: 20080317152
    Abstract: Three channel coding schemes for multi-carrier HSDPA packet data transmission are disclosed. The first scheme includes: dividing data into N groups (S210); performing CRC attachment, code block segmentation, channel coding and rate matching on each group of data respectively (S220); scrambling and interleaving the N groups of data unitedly, and then dividing the data into N groups again to perform QAM constellation rearrangement and then map to physical channels of respective carriers for transmission. The second scheme includes: dividing data to be sent into groups (S510); and sending each group of data via a physical channel of a carrier after coding it according to single-carrier HSDPA (S520). The third scheme includes: sending N carrier channels as a whole to a physical layer to perform processing from CRC attachment to QAM constellation rearrangement (S710); dividing the processed data into groups and mapping them to respective carrier channels for transmission (S720).
    Type: Application
    Filed: June 30, 2006
    Publication date: December 25, 2008
    Applicant: SHANGHAI ULTIMATE POWER COMMUNICATIONS TECHNOLOGY,
    Inventors: Shaohui Sun, Yingmin Wang, Guiliang Yang
  • Publication number: 20080317153
    Abstract: ICI canceling in an OFDM system includes taking a FFT of a wireless electrical signal to produce an OFDM signal; estimating a DC component of a frequency-selective channel in the OFDM system; obtaining an initial estimate of data symbols associated with data bits of the OFDM signal; correcting the data bits with a Viterbi decoder; encoding the corrected data bits to acquire corrected data symbols; re-estimating the DC component of the frequency-selective channel using the corrected data symbols; filtering the corrected data symbols and sub-carrier of the frequency-selective channel; calculating a first order differential function of the frequency-selective channel based on successive ones of the corrected data symbols; removing an ICI component from the calculated first order differential function; and re-estimating the data symbols as a function of the removed ICI component. The filtering occurs using a low pass filter comprising a bank of eight filters.
    Type: Application
    Filed: June 22, 2007
    Publication date: December 25, 2008
    Inventors: Mirette Sadek, Nabil Yousef
  • Publication number: 20080317154
    Abstract: The present invention provides a semiconductor integrated circuit device and a radio frequency module realizing reduction in high-order harmonic distortion or IMD. For example, a so-called antenna switch having a plurality of transistors between an antenna terminal and a plurality of signal terminals is provided with a voltage supply circuit. The voltage supply circuit is a circuit for supplying voltage from a voltage supply terminal to at least two signal terminals in the plurality of signal terminals via resistive elements. With the configuration, antenna voltage dropped due to a leakage or the like can be boosted and, for example, transistors in an off state can be set to a deep off state.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 25, 2008
    Inventors: Akishige Nakajima, Yasushi Shigeno, Takashi Ogawa, Shinnichirou Takatani, Shinya Osakabe, Tomoyuki Ishikawa
  • Publication number: 20080317155
    Abstract: This invention provides a method for dynamically adjusting the transmitter power (PTX) and data rate in a communications system. The scheme is specifically intended for wireless systems based on Code Division Multiple Access (CDMA) or on Multiple Input Multiple Output (MIMO) technology, but can be applied to all systems in which a so-called “Multi-User Detector” can be used. The method includes that the decision whether to increase or decrease the transmitter power (PTX) is based on the Signal to Interference plus Noise Ratio (SINR) at the receiver (S2), whereby the receiver (S2) determines the interference (PIF) with a Multi-User Detector. The interference level (PIF) is then communicated to the sender (S1) or alternatively the receiver (S2) determines the optimal transmitter power level (PTX) and communicates this level to the sender (S1). The proposed method reduces the power consumption and increases the performance e.g. in CDMA based systems.
    Type: Application
    Filed: March 28, 2006
    Publication date: December 25, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Georgios Orfanos, Jorg Habetha
  • Publication number: 20080317156
    Abstract: A method and apparatus for reducing a channel updating rate in a communication system are provided, in which a channel matrix H representing a channel status of physical channels is acquired, eigenvectors of the channel matrix H are output by a Singular Value Decomposition (SVD) of the channel matrix H, and when at least one of the eigenvectors has a phase inversion, the phase inversion is removed from the eigenvector.
    Type: Application
    Filed: March 3, 2008
    Publication date: December 25, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Kathiravetpillai SIVANESAN, Ho-Kyu CHOI, Dong-Seek PARK, Hung-Tuan NGUYEN, Tim BROWN, Patrick Claus Friedrich EGGERS, Persefoni KYRITSI
  • Publication number: 20080317157
    Abstract: A method of transmitting space-time coded data in a wireless communication system having a plurality of antennas is disclosed. More specifically, the method includes allocating data symbols combined with complex weights to at least two transmit antennas during at least one specified time slot, and transmitting the data symbols combined with complex weights to a receiving end via the at least two transmit antennas during the at least one specified time slot.
    Type: Application
    Filed: October 26, 2006
    Publication date: December 25, 2008
    Inventors: Bin Chul Ihm, Moon Lee, II, Jin Young Chun, Wook Bong Lee, Jae Won Chang, Jin Hyuk Jung
  • Publication number: 20080317158
    Abstract: Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and “water-pouring” results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to determine eigen-modes (i.e., spatial subchannels) of the MIMO channel and to derive a first set of steering vectors used to “precondition” modulation symbols. The singular value decomposition is also performed at the receiver to derive a second set of steering vectors used to precondition the received signals such that orthogonal symbol streams are recovered at the receiver, which can simplify the receiver processing. Water-pouring analysis is used to more optimally allocate the total available transmit power to the eigen-modes, which then determines the data rate and the coding and modulation scheme to be used for each eigen-mode.
    Type: Application
    Filed: August 18, 2008
    Publication date: December 25, 2008
    Applicant: QUALCOMM Incorporated
    Inventors: John W. Ketchum, Mark Wallace, Steven J. Howard, Jay Rod Walton
  • Publication number: 20080317159
    Abstract: A radio communication system has a plurality of transmission formats available for transmitting data signals, and a pilot signal is transmitted during the transmission of data to enable channel estimation. The transmit power of the pilot signal is varied depending on the current transmission format of the data, and is reduced in the periods between data transmissions.
    Type: Application
    Filed: September 15, 2005
    Publication date: December 25, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Timothy J. Moulsley, Matthew P.J. Baker
  • Publication number: 20080317160
    Abstract: Described herein are code-modulated multi-signal systems. In one embodiment, a multi-signal system receives multiple input signals and code-modulates each input signal with a unique code to distinguish the input signal from the other input signals. The input signals may come from multiple antennas, multiple sensors, multiple channels, etc. The code-modulated signals are then combined into a combined signal that is sent through shared blocks and/or transmitted across a shared medium in a shared path. After shared processing and/or shared transmission, the individual signals are recovered using matched filters. Each matched filter contains a code corresponding to one of the unique codes for recovering the corresponding signal from the combined signal. The recovered signals may then be inputted to additional processors for further processing.
    Type: Application
    Filed: March 3, 2008
    Publication date: December 25, 2008
    Inventors: Fred Tzeng, Amin Jahanian, Payam Heydari
  • Publication number: 20080317161
    Abstract: A module (101) for controlling the transmit power of a signal transmitter. The output power is determined from a first contribution based on a first set of parameters configured by an operator and a second contribution based on a second set of parameters. The module (101) is able to configure the second set of parameters based on the first set of parameters.
    Type: Application
    Filed: April 10, 2008
    Publication date: December 25, 2008
    Applicant: Alcatel Lucent
    Inventor: Jean-Marc PASCAL
  • Publication number: 20080317162
    Abstract: A system and method for transmitting/receiving data in a communication system is provided. A transmitter is allocated resources using a circuit mode scheme, determines if there is actual data to be transmitted to a receiver, and transmits information representing that there is no actual data to be transmitted using the allocated resources when it is determined that there is no actual data to be transmitted.
    Type: Application
    Filed: June 17, 2008
    Publication date: December 25, 2008
    Applicant: SAMSUNG ELECTRONICS CO. LTD.
    Inventors: Kwan-Hee Roh, Min-Hee Cho, Jae-Hee Cho, Jae-Woo So
  • Publication number: 20080317163
    Abstract: Systems and methods are provided for providing a hybrid signal having a reduced crest factor. A digital signal is generated that assumes one of a plurality of vector states at discrete sampling times, with each of the plurality of vector states having an associated phase. An analog signal is monitored to determine when a phase of the analog signal is aligned with the phase of a vector state assumed by the digital signal. A crest factor reduction is applied to the digital signal if the digital signal assumes a vector state having an associated phase aligned with the phase of the analog signal to provide a compressed digital signal. The compressed digital signal and the analog signal are combined to provide the hybrid signal. The analog signal is not altered prior to being combined with the compressed digital signal.
    Type: Application
    Filed: August 22, 2008
    Publication date: December 25, 2008
    Inventor: Timothy Wilfred Dittmer
  • Publication number: 20080317164
    Abstract: One aspect of the invention is directed to the provision of a circuit board mounted with a plurality of circuit components connected via a transmission line. The circuit components mounted on the circuit board includes at least a signal processor for processing a signal, a driver for transmitting the signal, and a receiver for receiving the signal. The driver includes a basic buffer, which is always on, and at least one control buffer, which can be individually controlled on and off, and which is connected in parallel with the basic buffer, and the output impedance of the basic buffer is set higher than the characteristic impedance of the transmission line.
    Type: Application
    Filed: August 27, 2008
    Publication date: December 25, 2008
    Applicant: Fujitsu Limited
    Inventor: Takuya Satou
  • Publication number: 20080317165
    Abstract: In one embodiment the present invention includes a method of calibrating the frequency response of a transmitter comprising generating a plurality of calibration tones across a frequency range, coupling the plurality of calibration tones to an input of said transmitter, detecting the plurality of calibration tones at an output in said transmitter, and in accordance therewith, generating a plurality of calibration values, receiving digital data to be transmitted, the digital data comprising a plurality of frequency components in said frequency range, and calibrating said frequency components of said digital data using the calibration values.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 25, 2008
    Applicant: WiLinx Inc.
    Inventors: Mahdi Bagheri, Rahim Bagheri, Saeed Chehrazi, Masoud Djafari, Hassan Maarefi, Ahmad Mirzaei, Edris Rostami, Alireza Tarighat-Mehrabani
  • Publication number: 20080317166
    Abstract: Systems and methods are described for transmitting a waveform having a controllable attenuation and propagation velocity. An exemplary method comprises: generating an exponential waveform, the exponential waveform (a) being characterized by the equation Vin=De?ASD[x?vSDt], where D is a magnitude, Vin is a voltage, t is time, ASD is an attenuation coefficient, and vSD is a propagation velocity; and (b) being truncated at a maximum value. An exemplary apparatus comprises: an exponential waveform generator; an input recorder coupled to an output of the exponential waveform generator; a transmission line under test coupled to the output of the exponential waveform generator; an output recorder coupled to the transmission line under test; an additional transmission line coupled to the transmission line under test; and a termination impedance coupled to the additional transmission line and to a ground.
    Type: Application
    Filed: March 26, 2008
    Publication date: December 25, 2008
    Inventors: Robert H. Flake, John F. Biskup, Su-liang Liao
  • Publication number: 20080317167
    Abstract: The present disclosure relates to different techniques of generation of a transmission signal, as for example, a transmitting apparatus for transmitting a communication signal and a method for transmitting a communication signal.
    Type: Application
    Filed: June 10, 2008
    Publication date: December 25, 2008
    Applicant: INFINEON TECHNOLOGIES AG
    Inventors: Zdravko Boos, Victor da Fonte Dias, Thomas Mayer
  • Publication number: 20080317168
    Abstract: Diversity techniques are commonly used in wireless communications to combat multi-path fading. Recent interests in ultra-wideband technology focus on multi-band OFDM systems that can explore the high diversity due to the independent frequency bands. To achieve full diversity with high data rate, a system (800), apparatus (500) and method that uses coded modulation with spreading rotation of transmitted signals. A 2×2 integer rotation matrix for QAM signals, 3×3 and 4×4 integer rotation matrices for QAM signals are provided. Compared with the non-regular QAM shape for real rotation matrices, each of these integer rotation matrices makes the regular QAM shape after rotation. The systematic design of these spreading matrices can be used to simplify the receiver structure such as simplified ML, MMSE and ZF, and then reduce their decoding complexity. Further, the present invention achieves cooperative diversity not only from distributed users but also from the signal space diversity of each user.
    Type: Application
    Filed: December 8, 2006
    Publication date: December 25, 2008
    Applicant: Koninklijke Philips Electronics, N.V.
    Inventors: Jun Yang, Monisha Ghosh
  • Publication number: 20080317169
    Abstract: A polar modulator arrangement has a first and a second node to receive a digital signal with a first and a second component corresponding to a digital amplitude component and a digital phase component. A digital interpolation filter generates an interpolated first component by interpolating and filtering the first component. A polar modulated radio frequency signal is generated by a combination element as a function of the interpolated first component and the second component.
    Type: Application
    Filed: June 22, 2007
    Publication date: December 25, 2008
    Inventors: Zdravko Boos, Benjamin Lindner, Thomas Mayer
  • Publication number: 20080317170
    Abstract: The present invention relates to a method and a corresponding device for embedding a secondary information signal in a channel data stream of encoded primary information signal. In order to make it more difficult for unauthorized persons or devices to retrieve the location of storage of the secondary information signal or its content itself a device is proposed according to the present invention comprising: an encoder (1) for encoding said primary information signal into a channel data stream, a control unit (3) for controlling the DC content of said channel data stream, a secondary information signal embedding unit (2) for embedding said secondary information signal in said channel data stream by using freedoms in the DC control, and an adaptation unit (4) for adapting the DC control by making non-optimal, arbitrary or random choices of the DC control at a number of locations of said channel data stream.
    Type: Application
    Filed: January 7, 2005
    Publication date: December 25, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONIC, N.V.
    Inventors: Petrus Henricus Cornelius Bentvelsen, Willem Marie Julia Marcel Coene
  • Publication number: 20080317171
    Abstract: A method for calibrating an I Q demodulator includes measuring I, Q, and low frequency data, correcting each set of measured data, combining the corrected I and Q data, interpolating the corrected low frequency data, and combining the corrected low frequency data and the combined corrected I and Q data.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 25, 2008
    Inventor: Roger Lee Jungerman
  • Publication number: 20080317172
    Abstract: A method for computing a factor matrix of an inversion of a matrix, wherein the method comprises the steps of: computing a factor matrix of an inversion of a sub-matrix of a matrix, and recursively obtaining the factor matrix of the inversion of the matrix by using the matrix and the computed factor matrix of the inversion of the sub-matrix of the matrix; and an apparatus for computing the factor matrix of the inversion of a matrix, which can reduce the computational complexity in the signal detection and matrix decomposition and can be implemented with hardware easily.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 25, 2008
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yi ZHANG, Hufei ZHU
  • Publication number: 20080317173
    Abstract: Aspects of a method and system for rate>1 SFBC and/or STBC using hybrid maximum likelihood (ML)/minimum mean squared error (MMSE) estimation are presented. Aspects of an exemplary system may enable rate 5/4 coding in diversity communication systems that utilize SFBC and/or STBC. A transmitting station may utilize SFBC or STBC to generate and/or concurrently transmit a plurality of signals symbols, which are encoded to enable rate 5/4 transmission. A receiving station may decode rate 5/4 encoded signals utilizing a hybrid decoding method. The hybrid decoding method may result from application of a plurality of decoding methods when decoding the rate 5/4 encoded signals. In an exemplary aspect of the invention, the hybrid method may utilize ML/MMSE estimation in combination with zero forcing (ZF) interference cancellation. The combination may be referred to as hybrid ML/MMSE estimation.
    Type: Application
    Filed: September 28, 2007
    Publication date: December 25, 2008
    Inventor: Joonsuk Kim
  • Publication number: 20080317174
    Abstract: When a correlation judging circuit judges that the correlation degree between r pulses in a reception signal and a generated substantially the same template as the r pulses is small, a pulse number adjusting circuit outputs a pulse number signal representing s pulses in place of the r pulses, and a template generating circuit generates the substantially the same template as the s pulses, whereby the correlation judging circuit judges the correlation degree between the r pulses in the reception signal and the generated substantially the same template as the s pulses. Accordingly, even when a confronted transmitter changes the number of pulses contained in a reception signal, synchronization capture of the reception signal can be established.
    Type: Application
    Filed: March 6, 2008
    Publication date: December 25, 2008
    Applicant: Seiko Epson Corporation
    Inventors: Isuke KARAKI, Makoto INOGUCHI
  • Publication number: 20080317175
    Abstract: An automatic gain control circuit includes: an amplification degree control section for calculating power of a digital value of a received signal, and for controlling an amplification degree of an amplifier of a receiving apparatus so that a difference between the power and predetermined reference power is zero; a received signal quality measuring section for measuring quality of the received signal; a reference power adjusting section for, upon finding that the measured quality of the received signal is below a fixed level, adjusting the reference power for a predetermined period of time; and a reference power updating section for causing the reference power adjusting section to continue to adjust the reference power until the quality of the received signal recovers to be at a predetermined recovery level or above, and for updating the reference power so that the reference power takes on an optimally adjusted value.
    Type: Application
    Filed: June 19, 2008
    Publication date: December 25, 2008
    Inventor: Shinya ITO
  • Publication number: 20080317176
    Abstract: The present invention relates to an automatic gain control apparatus and method in a wireless telecommunication system which measures the strength of received signals using preamble symbols and automatically control the gain of an amplifier based on the measurement results. The automatic gain control apparatus and method according to present invention performs automatic gain control of measuring sample power in a sample unit for input signals, acquiring a sample power average value during a unit symbol period, detecting a maximum value during one frame period for the acquired sample power average value and then calculating a gain control value based on it.
    Type: Application
    Filed: December 28, 2006
    Publication date: December 25, 2008
    Applicant: POSTDATA CO., LTD.
    Inventor: Ji-myung Oh
  • Publication number: 20080317177
    Abstract: A Wiener filtering arrangement includes a first filter configured to output at an output first signal estimates and a polyphase filter having an input configured to receive the first signal estimates and an output. The polyphase filter is configured to use only a subset of a plurality of reference signals to provide second signal estimates at said output.
    Type: Application
    Filed: August 29, 2007
    Publication date: December 25, 2008
    Inventor: Pedro Hoejen-Soerensen
  • Publication number: 20080317178
    Abstract: Aspects of a method and system for SFBC and/or STBC using interference cancellation are presented. Aspects of an exemplary system may enable rate 5 4 coding in diversity communication systems that utilize SFBC and/or STBC. A transmitting station may utilize SFBC or STBC to generate and/or concurrently transmit a plurality of signals symbols, which are encoded to enable rate 5 4 transmission. A receiving station may decode rate 5 4 encoded signals utilizing various methods to achieve interference cancellation. The interference cancellation may cancel at least a portion of intersymbol interference, which may occur among symbols in the received rate 5 4 encoded signals. Various methods may be utilized to compute estimated values for at least a portion of the symbols. These methods may include the class of linear estimation methods, such as minimum mean squared error (MMSE) estimation.
    Type: Application
    Filed: October 18, 2007
    Publication date: December 25, 2008
    Inventors: Joonsuk Kim, Nambirajan Seshadri, Sirikiat Ariyavisitakul
  • Publication number: 20080317179
    Abstract: A method and apparatus for the implementation of reduced state sequence estimation is disclosed, with an increased throughput using precomputation (look-ahead), with only a linear increase in hardware complexity with respect to the look-ahead depth. The present invention limits the increase in hardware complexity by taking advantage of past decisions (or survivor symbols). The critical path of a conventional RSSE implementation is broken up into at least two smaller critical paths using pipeline registers. Various reduced state sequence estimation implementations are disclosed that employ one-step or multiple-step look-ahead techniques to process a signal received from a dispersive channel having a channel memory.
    Type: Application
    Filed: February 28, 2008
    Publication date: December 25, 2008
    Inventors: Kameran Azadet, Erich Franz Haratsch
  • Publication number: 20080317180
    Abstract: An apparatus and method capable of interference signal removal is provided. The receiving apparatus includes a signal reception unit, a sampler which samples signal with carrier wave frequency, a signal filter, and a signal combiner.
    Type: Application
    Filed: January 11, 2008
    Publication date: December 25, 2008
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ick-jin KWON, Jae-sup LEE
  • Publication number: 20080317181
    Abstract: A communication apparatus (400) capable of supporting two bidirectional communication protocols is connected to a single bidirectional signal line and a controller (414). Software processes of the controller (414) include only processes of requesting transmission, setting transmission data, and decoding reception data. All communication processes, such as generation of a waveform during transmission, sampling of data during reception, decoding of a reception address, and the like, are hardware processes of the communication apparatus (400). In accordance with a control of a state determining circuit (405), the generation of a waveform during transmission is controlled by a transmission control circuit (409) and a data output circuit (111), while the sampling of data during reception and the decoding of a reception address are controlled by a waveform timing check circuit (407) and a reception control circuit (410).
    Type: Application
    Filed: July 14, 2006
    Publication date: December 25, 2008
    Inventors: Akihiro Suzuki, Makoto Hirano
  • Publication number: 20080317182
    Abstract: A multipath searcher and method includes a programmable decimation filter configured to adjust a sample rate of a received pilot signal. A plurality of correlators is configured to compare the received pilot signal to a reference code in a first mode and in a second mode. The first mode includes a low resolution search of a search window performed such that the plurality of correlators encompass an entire search window concurrently and the plurality of correlators receives a delayed reference code delayed to correspond with a portion of the search window in which a corresponding correlator performs correlation to identify peaks in the received pilot signal. The second mode includes a high resolution search of a refined search window only at or near identified peaks discovered in the first mode. The high resolution search is focused at the peak location by adjusting delays in the plurality of correlators.
    Type: Application
    Filed: January 27, 2006
    Publication date: December 25, 2008
    Inventors: Benyuan Zhang, Paul Gothard Knutson
  • Publication number: 20080317183
    Abstract: A method for clock tracing in a network and a method for clocking tracing, the method for clock tracing in a network includes: distributed network element or a centralized server in the network determining a shortest path to each of clock-source network elements according to stored network topology information and clock-tracing link weight information; determining, among clock sources provided by reachable clock-source network elements, one with an optimal quality, where a clock-source network element with that clock source being considered optimal; and taking a shortest path to the optimal clock-source network element as a clock-tracing path. Furthermore, the method for clocking tracing uses such a clock-tracing path for clock tracing.
    Type: Application
    Filed: November 2, 2005
    Publication date: December 25, 2008
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Xianlong Luo, Yu Wang, Lingling Lv, Kuiwen Ji, Changgui Xiao
  • Publication number: 20080317184
    Abstract: The present invention discloses a method for transmitting a synchronization signal in a mobile multimedia system. In the method, a transmitter of the system transmits a synchronization signal sequence at a regular interval. The methods includes: generating a first synchronization signal sequence; generating a second synchronization signal sequence by performing a reversible transform for the first synchronization signal sequence; and transmitting the first and the second synchronization signal sequences in cascade. By the method provided by the present invention for transmitting a synchronization signal in a mobile multimedia system, a channel with wider delay spread can be handled, more precise and stabler synchronization performance can be achieved and the channel estimation module can be helped to get more accurate channel frequency domain response.
    Type: Application
    Filed: June 25, 2008
    Publication date: December 25, 2008
    Inventors: Hui ZHANG, Junyun Yang, Fei Meng, Yu Xu, Jiongliang Li