Transmitter Patents (Class 375/146)
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Patent number: 7869528Abstract: An assembly and method for processing of multi-carrier signals is provided. A plurality of carrier signals are combined into a combined multi-carrier signal represented in a first domain. The combined multi-carrier signal is converted from the first domain to a second domain. The converted multi-carrier signal is distributed into a plurality of signals represented in the second domain.Type: GrantFiled: October 31, 2003Date of Patent: January 11, 2011Assignee: Northrop Grumman Systems CorporationInventor: Ian Robinson
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Patent number: 7869526Abstract: The present invention provides a single-stage tunable Ultra-Wideband (UWB) pulse generator, by creating and differentiating a variable edge rate signal. Edge rate variability is introduced by first applying a step recovery diode (SRD) to compress the edges of the source and then applying a simple RC network to adjust the edge rate. Next, the resulting signal is differentiated using microstrip transmission lines. The tunable generator resulting from this approach demonstrates a Gaussian and monocycle pulses with good symmetry and low distortion over the tunable range.Type: GrantFiled: December 19, 2006Date of Patent: January 11, 2011Assignee: University of South FloridaInventors: Erick Maxwell, Thomas Weller
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Publication number: 20110002364Abstract: A spread spectrum communication system includes a channel encoder configured for modulating a carrier signal with data to form an information signal. A spreading sequence generator is configured for generating a spreading sequence having a phase angle dependent upon a chaotic sequence and contiguously distributed over a predetermined range. The chaotic sequence also has a magnitude which is selectively dependent upon the pseudo-random number or chaotic sequence. The invention also includes a multiplier configured for forming a spread spectrum signal by multiplying the information signal by the spreading sequence. The spreading sequence generator is responsive to a magnitude control signal for controlling the selective dependency of said magnitude. The magnitude can be constant to form a constant amplitude zero autocorrelation signal. Alternatively, the magnitude can be allowed to vary in selectively controlled chaotic or pseudo-random manner to vary a peak to average power ratio.Type: ApplicationFiled: July 1, 2009Publication date: January 6, 2011Applicant: Harris CorporationInventors: Alan J. Michaels, David B. Chester
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Patent number: 7864880Abstract: Techniques are described that provide inter-symbol interference—(ISI) and multi-user interference—(MUI) resilient blind timing synchronization and low complexity demodulation in wireless communication systems. A nonzero mean symbol is transmitted with a predetermined period in a stream of zero mean symbols during a synchronization phase. Only zero mean symbols are transmitted outside of the synchronization phase. Blind or non-data aided synchronization is performed at the receiver while bypassing channel estimation. The techniques enable timing synchronization via energy detection and low-complexity demodulation by matching the received waveform to a synchronized aggregate template (SAT). The SAT is recovered by averaging samples of the received waveform during the synchronization phase.Type: GrantFiled: October 4, 2005Date of Patent: January 4, 2011Assignee: Regents of the University of MinnesotaInventors: Georgios B. Giannakis, Xiliang Luo
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Patent number: 7864876Abstract: A differential STBC transmitting/receiving apparatus in a multiple antenna system using eight or less transmit antennas is provided. In the differential STBC transmitting apparatus, a symbol mapper receives binary data and generates a number of symbols from the binary data, each symbol having a number of bits. A space-time block encoder generates an STBC by encoding the symbols. A differential processor differentially encodes the STBC through feedback and delay. A distribution matrix processor substitutes the differentially coded STBC into a distribution matrix preset according to the number of transmit antennas, and outputs the differential STBC code of the distribution matrix to the transmit antennas.Type: GrantFiled: December 23, 2004Date of Patent: January 4, 2011Assignee: Samsung Electronics Co., LtdInventors: Seung-Hoon Nam, Yung-Soo Kim, Jae-Hak Chung, Vahid Tarokh, Chan-Soo Hwang
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Patent number: 7860152Abstract: A wireless communication system. The system comprises transmitter circuitry (BST1), the transmitter circuitry comprising encoder circuitry (50) for transmitting a plurality of frames (FR). Each of the plurality of frames comprises a primary synchronization code (PCS) and a secondary synchronization code (SSC). The encoder circuitry comprises of circuitry (501) for providing the primary synchronization code in response to a first sequence (32). The encoder circuitry further comprises circuitry (502) for providing the secondary synchronization code in response to a second sequence (54) and a third sequence (56). The second sequence is selected from a plurality of sequences. Each of the plurality of sequences is orthogonal with respect to all other sequences in the plurality of sequences. The third sequence comprises a subset of bits from the first sequence.Type: GrantFiled: December 15, 2009Date of Patent: December 28, 2010Assignee: Texas Instruments IncorporatedInventors: Anand G. Dabak, Sundararajan Sriram, Srinath Hosur
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Patent number: 7860198Abstract: An overall SIR estimate is based on a weighted-average of different SIR estimates, wherein the weights are chosen to minimize the mean-square-error (MSE) of the overall SIR estimate. Alternatively, the overall SIR estimate is based on a selection from among the different SIR estimates, based on the expected reliability of each SIR estimate. The expected reliability of each SIR estimate may be based on the current format of the transmitted signal and/or a prior estimated SIR level.Type: GrantFiled: March 22, 2005Date of Patent: December 28, 2010Assignee: NXP B.V.Inventor: Giuseppe Montalbano
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Patent number: 7860151Abstract: A method of generating a multicarrier spread spectrum signal having a constant envelope includes partitioning multiple spreading codes into at least a first portion of spreading codes and a second portion of spreading codes. First and second modulating signals, respectively, are formed from the first and second portions of spreading codes. A first carrier spread spectrum signal is modulated with the first modulating signal to form a first modulated carrier signal, and a second carrier spread spectrum signal is modulated with the second modulating signal to form a second modulated carrier signal. The first and second modulated carrier signals are summed to form the multicarrier spread spectrum signal. The method includes combining spreading codes from the multiple spreading codes using majority voting logic to form the first and second portions of spreading codes.Type: GrantFiled: April 10, 2007Date of Patent: December 28, 2010Assignee: ITT Manufacturing Enterprises, Inc.Inventors: Goran Djuknic, Chi Chiu Chan
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Publication number: 20100322290Abstract: There is provided a communication method using a human body as a medium. A modulation apparatus using a frequency selective baseband according to an aspect of the invention may include: a serial-to-parallel conversion unit converting serial data supplied from an upper layer into parallel data consisting of M+1 number of data input bits; and a frequency selective spreader selecting one subgroup among a plurality of subgroups obtained by dividing 2N number (where N is a positive integer) of spreading codes used for frequency spreading by 2M (where M is a positive integer, and M<N is satisfied), and selecting and outputting one spreading code among 2M number of spreading codes of the one subgroup by using the M number of data input bits, and spreading codes obtained by performing bit circular shifts on the 2M number of spreading codes.Type: ApplicationFiled: October 24, 2008Publication date: December 23, 2010Applicant: Electronics and Telecommunications Research InstituteInventors: Tae Wook Kang, In Gi Lim, Hyung Il Park, Sung Weon Kang, Kyung Soo Kim, Sung Eun Kim, Jung Bum Kim, Jin Kyung Kim, Chang Hee Hyoung, Jung Hwan Hwang, Ki Hyuk Park, Jae Hoon Shim, Hey Jin Myoung
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CONSTANT AMPLITUDE ENCODING APPARATUS AND METHOD FOR CODE DIVISION MULTIPLEXING COMMUNICATION SYSTEM
Publication number: 20100322289Abstract: Disclosed are an apparatus and method for constant amplitude encoding of a transmission signal in a CDM (Code Division Multiplexing) communication system. The apparatus for constant amplitude encoding of a transmission signal includes: an encoding module sequentially performing horizontal encoding and vertical encoding on an input signal; and a spreading and multiplexing module spreading the signal which has been encoded by the encoding module and multiplexing the spread signal in a vertical direction to output a data stream having a constant amplitude.Type: ApplicationFiled: June 16, 2010Publication date: December 23, 2010Applicant: Electronics and Telecommunications Research InstituteInventors: Tae Joon PARK, Wun Cheol Jeong, Kyo Hoon Son, Ho Yong Kang, Seong Soon Joo, Jong Suk Chae -
Publication number: 20100316091Abstract: Examples are disclosed for transmitting and receiving schemes for multiuser single-carrier space time spreading (STS) with frequency domain equalization.Type: ApplicationFiled: June 16, 2009Publication date: December 16, 2010Inventors: Yeheskel Bar-Ness, Kodzovi Acolatse
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Publication number: 20100316090Abstract: The invention concerns a chaotic communications system, method and apparatus having a transmitter configured to spread an input data signal over a wide intermediate frequency band, by digitally generating a first chaotic sequence of values to form a spreading code. The spreading code is then used to form a digital IF chaotic spread spectrum signal having a uniform sampling interval. The duration of the sampling interval is then selectively varied in accordance with a first pseudo-random sequence, thereby introducing a known dither in the digital IF chaotic spread spectrum signal. After introducing the known dither, the digital IF chaotic spread spectrum signal is converted to an analog RF spread spectrum signal at a conversion rate that exceeds the sampling interval of the chaotic spread spectrum signal. A corresponding receiver recovers the input data from the spread transmitted signal. This spreading may utilize a chaotic sequence employing discrete time chaos dithering.Type: ApplicationFiled: June 10, 2009Publication date: December 16, 2010Applicant: Harris CorporationInventors: David B. Chester, Alan J. Michaels
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Patent number: 7852949Abstract: A communication system is provided which implements a method for up-converting a baseband signal to a given number of frequency bands that together define a signal transmission channel. A sequential order is defined in which the frequency bands are to be used for up-converting the baseband signal, and up-converting the baseband signal to one frequency band after the other in the defined sequential order such that the spectral distance between two frequency bands is equal or higher for the frequency bands being direct neighbors in the defined sequential order than being direct neighbors in the spectral order.Type: GrantFiled: March 31, 2005Date of Patent: December 14, 2010Assignee: Sony International (Europe) GmbHInventors: Jens-Uwe Jürgensen, Richard Stirling-Gallacher
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Patent number: 7852959Abstract: A method of transmitting a control signal in a wireless communication system includes allocating a first sequence to spread a first control signal in a radio resource, allocating a second sequence to spread a second control signal in the radio resource, selecting one of the first control signal and the second control signal, generating a spread control signal by spreading the selected control signal, and transmitting the spread control signal in the radio resource, wherein the first sequence and the second sequence use different cyclic shifts of a base sequence.Type: GrantFiled: May 30, 2008Date of Patent: December 14, 2010Assignee: LG Electronics Inc.Inventors: Jin Sam Kwak, Seung Hee Han, Min Seok Noh, Yeong Hyeon Kwon, Hyun Woo Lee, Dong Cheol Kim
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Patent number: 7852903Abstract: A wireless transmission device enabled to improve an error rate performance at a receiver, by acquiring at least one of frequency diversity effect and a time diversity effect while keeping the interference resistance which is acquired by diffusion. In this transmission device, a modulation unit (101) modulates data to create a modulation symbol having in-phase components and quadrature components. An IQ individual spreading unit (102) arranges the diffusion chips, which are obtained by spreading the modulation symbol, of the in-phase components and the quadrature components, in areas extending in diffusion domains set individually for the in-phase components and the quadrature components. An IQ combining unit (103) combines the arranged spreading chips of the in-phase components and the quadrature components.Type: GrantFiled: May 20, 2005Date of Patent: December 14, 2010Assignee: Panasonic CorporationInventors: Masaru Fukuoka, Isamu Yoshii, Kenichi Miyoshi
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Publication number: 20100309958Abstract: Certain aspects of the present disclosure relate to a method for generating single carrier signals with spread-spectrum coded preambles using constant envelope 2-CPM modulation for transmission in a wireless communication system, and for efficient despreading method at a receiver.Type: ApplicationFiled: June 8, 2009Publication date: December 9, 2010Inventor: Ismail Lakkis
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Publication number: 20100309954Abstract: 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: ApplicationFiled: August 18, 2010Publication date: December 9, 2010Applicant: QUALCOMM IncorporatedInventor: Joseph P. Odenwalder
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Publication number: 20100309957Abstract: Embodiments of the present invention provide a system and method for further reducing cyclostationarity and correspondingly energy density in a chaotic spread spectrum data communication channel, by digitally generating a first chaotic sequence of values to form a spreading code. The spreading code is then used to form a digital IF spread spectrum signal having a uniform sampling interval. The digital IF spread spectrum signal is converted to a sampled analog IF spread spectrum signal at a conversion rate substantially equal to the uniform sampling interval. The duration of the sampling interval is then selectively varied in accordance with a first pseudo-random sequence, thereby introducing a known dither in the analog IF spread spectrum signal. After introducing the known dither, the analog IF spread spectrum signal is upconverted to an analog RF spread spectrum signal. The first pseudo-random sequences may be designed to be a chaotic sequence.Type: ApplicationFiled: June 8, 2009Publication date: December 9, 2010Applicant: Harris CorporationInventors: David B. Chester, Alan J. Michaels
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Patent number: 7843990Abstract: An apparatus includes a transmitter configured to transmit symbols to one or more receivers via a plurality of communication channels of a physical communication link. The transmitter is configured to estimate a phase of one or more off-diagonal elements of a channel matrix for the physical communication link based on values of signal-to-interference-plus-noise ratios at the one or more receivers.Type: GrantFiled: August 31, 2007Date of Patent: November 30, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Gerhard Guenter Theodor Kramer, Philip Alfred Whiting, Miroslav Zivkovic
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Patent number: 7844013Abstract: A link adaptation method and others wherein feedback information amount can be reduced. According to this method, a receiving apparatus (100) calculates, based on a channel matrix, a capacity (C) and a stream ratio (r) that is a ratio of the reception qualities of streams, and then transmits, as feedback information, the calculated capacity (C) and stream ratio (r) to a transmitting apparatus. In the transmitting apparatus (200), the number of transmittable streams, the modulation scheme and the fed-back capacity (C) are used to calculate the encoding ratio (R) and sequence length (S) of spatial multiplexed symbols. Then, the modulation scheme (M1-Mn) of each stream is decided based on the fed-back stream ratio (r) and the sequence length (S) of spatial multiplexed symbols.Type: GrantFiled: April 24, 2006Date of Patent: November 30, 2010Assignee: Panasonic CorporationInventors: Masayuki Hoshino, Ryohei Kimura, Yasuaki Yuda, Tomohiro Imai, Kenichi Miyoshi, Akihiko Nishio
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Patent number: 7844292Abstract: Systems and methods are disclosed for in-band control signaling using bandwidth distributed encoding to send modulated control carrier signals with analog voice signals in the same voice frequency band. A transmitting device generates control carrier signals spread over a voice frequency band, combines them with analog voice signals in the voice frequency band, and transmits the combined signals over a communication channel. The transmitting device can use a control signal encoder to apply a pseudo-random code to the control carrier signal in order to spread it over a voice frequency band. As such, control signals are sent as in-band signals without significantly degrading the voice signals. A receiving device receives the combined signals within the voice frequency band. The receiving device demodulates the combined signal and uses matching pseudo-random codes to determine if a control signal has been sent. The receiving device also reproduces the voice signals themselves.Type: GrantFiled: April 26, 2007Date of Patent: November 30, 2010Inventor: Kenneth H. Shamburger
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Patent number: 7843988Abstract: A system for pre-processing transmission sequences in a jammed environment. System a transmitter suitable for transmitting the synchronization preamble further comprising a pseudo noise generator suitable for running a non predictable pseudo random algorithm. Pseudo random algorithm is suitable for generating a codeword operable as a pointer indexed into a table of gold sequences. Pointer is suitable for selecting a pseudo random selection of gold sequences from the table of gold sequences. Pseudo random selection of gold sequences forms a synchronization preamble. Gold sequences are concatenated together to form the synchronization preamble. System further comprises a receiver configured to receive the transmitted synchronization preamble further comprising of a decryption key suitable for decrypting received synchronization preamble.Type: GrantFiled: September 21, 2006Date of Patent: November 30, 2010Assignee: Rockwell Collins, Inc.Inventor: Timothy E. Snodgrass
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Patent number: 7843989Abstract: A method for embedding a first signal in the coding of a second signal is described. A value of the first signal is determined. A codebook based on the value of the first signal is generated. A second signal is encoded using a codeword from the generated codebook. The encoded second signal is modulated into a plurality of symbols, wherein the symbols are distributed according to the value of the first signal. The modulated symbols are inserted into one or more time slots of a sequence.Type: GrantFiled: June 26, 2007Date of Patent: November 30, 2010Assignee: Sharp Laboratories of America, Inc.Inventors: Huaming Wu, Lizhong Zheng
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Patent number: 7839939Abstract: Spread spectrum transmission of information is performed using chaotic signals. Direct chaotic communication systems in which information is input to chaotic signal generated directly in information transmission frequency band, are achieved by forming broadband information carrier necessary for transmission and using a chaotic dynamic system whose structure is synthesized in advance in accordance with predetermined characteristics of broadband information carrier to cause chaotic dynamic system to provide operation of forming the broadband information carrier in form of a chaotic information carrier having prescribed spectral characteristics.Type: GrantFiled: November 24, 2004Date of Patent: November 23, 2010Assignees: Samsung Electronics Co., Ltd., Institute of Radio Engineering and Electronics of RASInventors: Seong-soo Lee, Young-hwan Kim, Alexander S. Dmitriev
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Publication number: 20100284440Abstract: Methods and systems for direct sequence spread spectrum (DSSS) signals are described herein. In an embodiment, a DSSS signal includes a time multiplexed spreading time series. The time multiplexed spreading time series includes a data spreading time series includes at least a first spreading symbol, and a pilot spreading time series includes at least a second spreading symbol and a third spreading symbol. The second spreading symbol and the third spreading symbol are different.Type: ApplicationFiled: April 7, 2010Publication date: November 11, 2010Applicant: The MITRE CorporationInventors: John W. BETZ, Christopher J. Hegarty, Joseph J. Rushanan
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Patent number: 7826558Abstract: First normalizing means (12) normalizes first and second code streams (s1, s2). First spreading means (13) spreads the output of the first normalizing means (12). STTD coding means (14) subjects the first and second code streams (s1, s2) to STTD coding. Second normalizing means (15) normalizes the output of the STTD coding means (14). Second spreading means (16) spreads the output of the second normalizing means (15) by means of the same spreading code as that of the first normalizing means (12). Orthogonal transforming means (17) gives the negative signs to odd chips in a second path spread sequence of each code and exchanges the orders of the odd and even chips. Combining means (18) adds first and second spread sequences of the second path produced by orthogonally transforming the first and second spread sequences of the first path. With this, by using the orthogonality of the transmitted sequences at the receiving side, the reception signal can be detected with a lower complexity.Type: GrantFiled: March 29, 2006Date of Patent: November 2, 2010Assignee: Panasonic CorporationInventors: Zheng Zhao, Jifeng Li
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Patent number: 7826604Abstract: Three-way call detection is an important component of correctional facility telephone equipment because it helps restrict calling access by certain persons to certain restricted telephone numbers. Various three-way call detection methods exist, but all of these implementations suffer from one major limitation—the detection accuracy is not as high as is desired by the industry. The present invention improves detection accuracy, using “steganography.” Steganography involves hiding one set of data or signals within another signal or carrier in such a way that its presence is virtually imperceptible to the end recipient, and potential even the originator of the carrier signal. Television producers use steganographic methods to encode data in video signals for security, distribution monitoring, piracy-control, and other reasons.Type: GrantFiled: July 24, 2007Date of Patent: November 2, 2010Assignee: DSI-ITI, LLCInventor: Thomas J. Martin
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Publication number: 20100272157Abstract: Certain aspects of the present disclosure relate to a method for generating spread-spectrum coded signals for transmission in a wireless communication system, and for efficient despreading at a receiver.Type: ApplicationFiled: April 26, 2009Publication date: October 28, 2010Inventor: ISMAIL LAKKIS
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Publication number: 20100272159Abstract: A frequency selective digital transmission apparatus includes: a preamble transmission processing unit generating a preamble for frame synchronization and spreading the generated preamble with a predetermined spreading code; a header transmission processing unit configuring a header including data attribute information and spreading the header with a predetermined spreading code; a data transmission processing unit performing serial-to-parallel conversion on transmission data according to a selected transmission mode and a spreading scheme and spreading the same with a frequency selective spreading code; and a multiplexing unit multiplexing the preamble, the header, and the data which have been spread by the preamble transmission processing unit, the header transmission processing unit and the data transmission processing unit, respectively, and transmitting the same as digital signals.Type: ApplicationFiled: April 26, 2010Publication date: October 28, 2010Applicant: Electronics and Telecommunications Research InstituteInventors: In Gi LIM, Hyung Il Park, Tae Wook Kang, Chang Hee Hyoung, Sung Weon Kang, Jung Hwan Hwang, Kyung Soo Kim, Jung Bum Kim, Sung Eun Kim, Jin Kyung Kim, Hey Jin Myoung, Seok Bong Hyun, Kyung Hwan Park, Byoung Gun Choi, Tae Young Kang
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Publication number: 20100272158Abstract: Certain aspects of the present disclosure relate to a method for generating Golay codes and generalized Golay codes in a wireless communication system, and for efficient spreading at a transmitter and despreading at a receiver.Type: ApplicationFiled: April 26, 2009Publication date: October 28, 2010Inventor: Ismail Lakkis
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Patent number: 7822097Abstract: A method for generating an ultra-wideband communications signal is described. The method includes generating a piecewise linear ultra-wideband baseband signal comprising at least one pulse, based on an inputted data signal; generating a carrier tone having a carrier frequency suitable for wireless transmission; and upconverting the baseband signal with the carrier tone to the carrier frequency. A method for interpreting a received ultra-wideband communications signal, the signal having a center frequency in the RF domain, is also described. The method includes generating at least one local signal template, synchronized with the received ultra-wideband communications signal and having substantially the same center frequency; correlating the received ultra-wideband communications signal with each of the local signal templates in the analog domain, obtaining at least one ultra-wideband baseband signal; and interpreting the at least one ultra-wideband baseband signal to generate a data signal.Type: GrantFiled: August 22, 2005Date of Patent: October 26, 2010Assignee: IMECInventor: Julien Ryckaert
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Patent number: 7822102Abstract: Aspects of a method and system for an efficient channel quantization method or MIMO pre-coding systems may include quantizing channel state information in a MIMO pre-coding system onto a codebook, which comprises one or more unitary matrices, using a cost function; selecting a quantization function that enables the quantizing based on a number of receive antennas and a number of transmit antennas associated with the MIMO pre-coding system; and selecting the cost function from a set of cost functions based on the number of receive antennas and the number of transmit antennas. The channel state information may be a matrix ?.Type: GrantFiled: June 22, 2007Date of Patent: October 26, 2010Assignee: Broadcom CorporationInventors: Mark Kent, Vinko Erceg, Jun Zheng
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Patent number: 7822147Abstract: The invention provides a type-based method to compensate for distortions in circuits operating on a plurality of input modulated signals to form one or more output modulated signals. Steps of the method include low-rate sampling of the output signal to obtain a statistical characteristics thereof, and adjusting parameters of the circuit to introduce a controlled degree of cross-coupling between the signals until the statistical characteristics of the output signal approximates a reference characteristics defined by the used modulation formats. Another aspect of the invention provides a self-calibrating multi-port circuit implementing the method.Type: GrantFiled: February 6, 2007Date of Patent: October 26, 2010Assignee: Her Majesty the Queen in Right of Canada as Represented by the Minister of Industry, Through the Communications Research Centre CanadaInventors: Xinping Huang, Mario Caron
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Patent number: 7822144Abstract: A communication system includes a transmitter having a signal generator for generating a signal for transmitting data, a transmission delay unit for repeatedly delaying the signal from the signal generator for a predetermined delay time within a symbol period and generating corresponding delayed signals, and a selector for selectively providing one of the delayed signals from the transmission delay unit to an antenna; and a receiver having a reception delay unit for receiving the signal from the transmitter and delaying the signal as long as the delay time of the transmission delay unit, and a data judgment block for discriminating data bits of the signal from the transmitter by comparing the signal from the transmitter with the delayed signal from the reception delay unit. According to the communication system, the delay time can be accurately adjusted even if the delay line is shortened, and the data bits of the communication signal can be accurately judged in the receiver side.Type: GrantFiled: July 14, 2006Date of Patent: October 26, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hyon Kim, Young-hwan Kim, Hyoun kuk Kim, Hyun cheol Park, Seong-soo Lee, Jae seung Son
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Publication number: 20100265898Abstract: A method of transmitting an ACK/NACK signal via an ACK/NACK channel including one or more tiles comprised of a plurality of OFDM symbols in a time domain and a plurality of subcarriers in a frequency domain in a wireless communication system includes generating a first codeword by applying a first spreading code to data symbols and pilot symbols, wherein the tile includes a plurality of data subcarriers and a plurality of pilot subcarriers, the data symbols are allocated to the plurality of data subcarriers and the pilot symbols are allocated to the plurality of pilot subcarriers, generating a second codeword by allocating data symbols applied a second spreading code to the plurality of data subcarriers, and transmitting the first and second codewords.Type: ApplicationFiled: November 26, 2008Publication date: October 21, 2010Inventors: Jin Young Chun, Bin Chul Ihm, Wook Bong Lee, Ki Seon Ryu
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Patent number: 7817707Abstract: Disclosed is an apparatus for generating a ranging pseudo noise (PN) code used in a base station of a portable internet system of an orthogonal frequency division multiplexing access scheme, wherein a ranging pseudo noise mask value is generated using a cell ID number, and then the generated ranging pseudo noise mask value is stored in a memory. A final ranging PN code is generated using the stored ranging PN mask value and a status of a pseudo random binary sequence for generating a ranging PN code. With such a structure, the maximal 256-numbered ranging PN code values can be obtained simultaneously with each 144 bit-length.Type: GrantFiled: November 11, 2005Date of Patent: October 19, 2010Assignees: Samsung Electronics Co., Ltd., Electronics and Telecommunications Research Institute, KT Corporation, SK Telecom Co., Ltd., KTFreetel Co., Ltd., Hanaro Telecom., Inc.Inventors: Kyung-Yeol Sohn, Chang-Wahn Yu, Youn-Ok Park
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Patent number: 7817744Abstract: A wireless transmitting apparatus capable of improving the reception characteristic at a data stream receiving end. In this apparatus, I/Q separating parts (110, 112) each separate first data modulated symbols included in any of a plurality of data streams, which are to be multiplexed, into first in-phase components and first orthogonal components, while separating second data modulated symbols included in the other ones of the plurality of data streams into second in-phase components and second orthogonal components. An I/Q converting part (114) converts the first in-phase components to third orthogonal components, while converting the second orthogonal components to fourth in-phase components. A multi-code multiplexing part multi-code multiplexes the first and third orthogonal components to provide a first multiplexed signal, while multi-code multiplexing the second and fourth in-phase components to provide a second multiplexed signal.Type: GrantFiled: December 1, 2005Date of Patent: October 19, 2010Assignee: Panasonic CorporationInventors: Masaru Fukuoka, Isamu Yoshii, Kenichi Miyoshi
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Publication number: 20100260236Abstract: In at least some embodiments, a communication device includes a transceiver with a physical (PHY) layer. The PHY layer is configured for body area network (BAN) operations in a limited multipath environment based on a constant symbol rate for BAN packet transmissions and based on M-ary PSK, differential M-ary PSK or rotated differential M-ary PSK modulation. The PHY layer is configured to construct a physical-layer service data unit (PSDU) based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem (BCH) encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper.Type: ApplicationFiled: April 14, 2010Publication date: October 14, 2010Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Anuj BATRA, Timothy M. SCHMIDL, Srinath HOSUR, June Chul ROH
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Publication number: 20100260234Abstract: Channel information feedback takes place by calculating channel information to feed back to the base station. The channel quality information is spread by a remote unit with spreading codes from mutually unbiased bases and transmitted to the base station. The advantages of spreading the feedback channel are that multiple mobiles can send their feedback on the same time-frequency resources making the feedback very efficient and also improving feedback performance through orthogonal spreading which gives a spreading gain above noise and interference. Using the spreading codes from mutually unbiased bases can reduce interference across sectors.Type: ApplicationFiled: April 9, 2009Publication date: October 14, 2010Applicant: MOTOROLA, INC.Inventors: Timothy A. Thomas, William J. Hillery, Bishwarup Mondal, Frederick W. Vook, Fan Wang
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Publication number: 20100260235Abstract: It is possible to provide a novel pilot transmission method which can calculate an accurate channel estimation value, a MIMO transmission device using the pilot transmission method, and a MIMO reception device which performs communication with the MIMO transmission device. The MIMO transmission device (100) includes a cyclic shift processing unit (150) which cyclically shifts a first pilot signal sequence spread by a spread code 1 and second pilot signal sequence spread by a spread code 2 with different shift amounts. The first pilot signal sequence and the second pilot signal sequence which have been cyclically shifted are transmitted from different transmitting antennas at the same pilot transmission symbol section. Thus, by changing the shift amount of the cyclic shift process executed on each pilot signal sequence spread by the respective spread codes, it is possible to improve the pilot separation accuracy at a reception side. This enables more accurate calculation of a channel estimation value.Type: ApplicationFiled: December 10, 2008Publication date: October 14, 2010Applicant: Panasonic CorporationInventors: Isamu Yoshii, Atsushi Sumasu, Tomohiro Imai, Hidenori Kayama
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Patent number: 7813411Abstract: A frequency synthesizer is described illustrating a system and method for modulation. In particular, the frequency synthesizer includes a control circuit for producing a plurality of input signals that is scalable to a frequency profile. Each of the input signals includes a slope and a direction of the slope. A higher order accumulator block is coupled to the control circuit and receives the plurality of input signals. The higher order accumulator block includes at least two accumulators. The higher order accumulator block sums the plurality of input signals to generate a standard curve that is non-linear. A frequency spreading control pattern generation modulator is coupled to the higher order accumulator block and modulates the standard curve to generate the desired frequency profile.Type: GrantFiled: October 30, 2006Date of Patent: October 12, 2010Assignee: Cypress Semiconductor CorporationInventor: Shuliang Li
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Patent number: 7813412Abstract: The radio base station apparatus includes a first despreading processing circuit for despreading a first control channel (DPCCH) signal; a second despreading processing circuit for despreading either a second control channel (HS-DPCCH) signal or a third control channel (E-DPCCH) signal; a third despreading processing circuit capable of despreading the first control channel signal, the second control channel signal and the third control channel signal; a first scrambling code generation circuit for supplying a common scrambling code to both the first despreading processing circuit and the second despreading processing circuit; and a second scrambling code generation circuit for supplying to the third despreading processing circuit a scrambling code which is different from the scrambling code generated in the first scrambling code generation circuit.Type: GrantFiled: July 20, 2007Date of Patent: October 12, 2010Assignee: Fujitsu LimitedInventor: Masaomi Yoshida
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Patent number: 7813447Abstract: An apparatus, system, and method are disclosed for dynamic phase equalization in a communication channel. A transmitter history module stores a plurality of bits from a data stream that is transmitted through the communication channel. A transmitter detection module detects a pre-transition bit of a first value that is preceded in the data stream by at least one bit of the first value and followed by a transition bit with a second value. A driver module transmits the data stream by driving the communication channel. A transition module pre-drives the communication channel to the second voltage of the transition bit during a bit time interval of the pre-transition bit.Type: GrantFiled: November 15, 2006Date of Patent: October 12, 2010Assignee: International Business Machines CorporationInventors: Daniel N. De Araujo, Moises Cases, Bradley D. Herrman, Erdem Matoglu, Bhyrav M. Mutnury, Pravin S. Patel, Nam H. Pham
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Publication number: 20100246642Abstract: In one aspect of a multiple-access OFDM-CDMA system, the data spreading is performed in the frequency domain by spreading each data stream with a respective spreading code selected from a set of available spreading codes. To support multiple access, system resources may be allocated and de-allocated to users (e.g., spreading codes may be assigned to users as needed, and transmit power may be allocated to users). Variable rate data for each user may be supported via a combination of spreading adjustment and transmit power scaling. Interference control techniques are also provided to improve system performance via power control of the downlink and/or uplink transmissions to achieve the desired level of performance while minimizing interference. A pilot may be transmitted by each transmitter unit to assist the receiver units perform acquisition, timing synchronization, carrier recovery, handoff, channel estimation, coherent data demodulation, and so on.Type: ApplicationFiled: June 10, 2010Publication date: September 30, 2010Applicant: QUALCOMM INCORPORATEDInventors: Jay R. Walton, John W. Ketchum, Steven J. Howard, Mark Wallace
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Publication number: 20100246643Abstract: Provided are a system and method for human body communication using a limited passband. The system includes a transmission frame generating unit for human body communication which generates a transmission frame for human body communication based on data information including user identification (ID) and data scrambled into an orthogonal code generated by the user ID; a symbol mapping unit for symbolizing the generated transmission frame for human body communication according to a predetermined modulating method; a spreading unit for spreading the symbol outputted in the symbol mapping unit; a waveform generating unit for generating a baseband signal whose band is limited to a predetermined range with respect to the data spread in the spreading unit; and a middle band transmitting unit for modulating the baseband signal into a predetermined limited passband signal.Type: ApplicationFiled: October 29, 2007Publication date: September 30, 2010Inventors: In-Gi Lim, Jung-Hwan Hwang, Sung-Weon Kang, Kyung-Soo Kim, Jung-Bum Kim, Hyung-Il Park, Chang-Hee Hyoung, Duck-Gun Park, Sung-Eun Kim, Jin-Kyung Kim, Tae-Joon Kim, Jin-Bong Sung, Hyuk Kim, Ki-Hyuk Park
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Publication number: 20100246641Abstract: The present invention provides a time-frequency code spreading method in an OFDMA system. The method includes: converting a transmission message into one or more modulating signal vectors, and each bit of the transmission message is spread onto all vector elements of a modulating signal vector; mapping one or more modulating signal vectors to a set of time-frequency grids, wherein in an OFDMA time-frequency plane, two time-frequency grids to which any two vector elements in each modulating signal vector are mapped do not have the same frequency location or time location. In addition, the present invention also provides a time-frequency code spreading apparatus in an OFDMA system.Type: ApplicationFiled: September 27, 2008Publication date: September 30, 2010Applicant: BEIJING XINWEI TELECOM TECHNOLOGY INC.Inventor: Hang Li
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Publication number: 20100238978Abstract: A method and apparatus are provided for transmitting a multicarrier spread-spectrum signal formed by a temporal succession of multicarrier symbols, using OQAM modulation and a plurality of inter-orthogonal spreading codes. The method includes spreading at least one complex-value data symbol, representative of a source data signal to be transmitted, over a set of sub-carriers of at least one multicarrier symbol, each of the sub-carriers modulating a complex value.Type: ApplicationFiled: April 18, 2008Publication date: September 23, 2010Applicant: FRANCE TELECOMInventors: Chrislin Lele, Pierre Siohan, Rodolphe Legouable, Maurice Bellanger
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Publication number: 20100238979Abstract: A method for transmitting signals for interference randomization is disclosed. The method for transmitting signals includes spreading the transmission signals using a plurality of orthogonal codes and transmitting the transmission signals spread by the plurality of orthogonal codes by a spatial frequency block coding (SFBC) or spatial time block coding (STBC) scheme. Among the plurality of orthogonal codes, codes of which mutual interferences are equal to or greater than a predetermined threshold are grouped to the same group, and orthogonal codes belonging to different groups are used for the spreading of the signals which are transmitted at the same timing. Accordingly, it is possible to realize interference randomization.Type: ApplicationFiled: October 1, 2008Publication date: September 23, 2010Inventors: Dae Won Lee, Nam Yul Yu, Dong Wook Roh, Sung Hoon Chung, Jung Hoon Lee
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Patent number: 7801200Abstract: Various systems and methods for code dependency reduction are disclosed herein. For example, one method includes receiving an un-encoded data set that is represented as an array of columns and rows. In addition, two groups of data bits traversing the un-encoded data set at respective angles are formed. Based at least in part on the aforementioned groups of data sets, an angle at which a third group of data bits will traverse the un-encoded data set is identified, and a third group of data bits traversing the un-encoded data set at the third angle is formed.Type: GrantFiled: July 31, 2006Date of Patent: September 21, 2010Assignee: Agere Systems Inc.Inventor: Weijun Tan
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Patent number: 7801532Abstract: A method for transmitting a signal by a transmitter in a frequency overlay communication system. The method includes generating y first signal groups by shuffling input information data with a length yN on an N-by-N grouping basis according to a first shuffling scheme; generating y second signal groups by performing N-point IFFT on each of the first signal groups; generating y third signal groups by multiplying each of the second signal groups by preset values; generating N fourth signal groups by de-shuffling the third signal groups on a y-by-y grouping basis according to a de-shuffling scheme; generating N fifth signal groups by performing y-point IDFT on each of the fourth signal groups; generating y sixth signal groups by shuffling the fifth signal groups according to a second shuffling scheme, and serial-converting the sixth signal groups; and performing a transmission RF process on the serial-converted signal and transmitting the RF-processed signal to a receiver.Type: GrantFiled: June 29, 2006Date of Patent: September 21, 2010Assignee: Samsung Electronics Co., LtdInventors: Chang-Ho Suh, Dong-Seek Park, Young-Kwon Cho, Eun-Taek Lim, Jin-Kyu Koo, Jung-Soo Woo