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| Number | Title | Issue Date |
| 7920462 | Amplitude attenuation estimation and recovery systems for OFDM signal used in communication systems This disclosure relates to amplitude correction for orthogonal frequency division multiplexing signals received by a communication device. An amplitude attenuation estimation is performed for amplitude correction on received OFDM signals. ... | 04/05/2011 |
| 7916625 | Method for variable cyclic length in OFDM communications Messages transmitted between a receiver and a transmitter are used to maximize a communication data rate. In particular, a multicarrier modulation system uses messages that are sent from the receiver to the transmitter to exchange one or more sets of optimized commu... | 03/29/2011 |
| 7907513 | Superimposed composite channel filter Methods and systems are provided to generate digital coefficients for a filter. The generation of coefficients relies on a Fourier transformation of an impulse response in time domain that is zero padded, e.g., zeros are appended to an array corresponding to a sampl... | 03/15/2011 |
| 7898935 | OFDM/DMT/digital communications system including partial sequence symbol processing A method of managing a signal over a symbol period includes supplying samples of the signal at beginning and end portions of the symbol period. The method further includes suppressing the supply of samples of the signal at a middle portion of the symbol period. ... | 03/01/2011 |
| 7898936 | Combined OFDM and wavelet multi-carrier transceiver A multicarrier transmitter and receiver uses a first inverse fast Fourier transformer for performing an Inverse Fast Fourier Transform (IFFT) on a parallel input data signal, an imaginary component filter for filtering out the imaginary component of an output signal... | 03/01/2011 |
| 7894331 | Adaptive time-domain interpolation for OFDM scattered pilot symbols A receiver for use in a pilot-aided OFDM system and a method of performing channel length estimation of a channel in a wireless communication system includes using transmitted and received wireless signals to estimate a channel carrier function vector at continuous ... | 02/22/2011 |
| 7864663 | Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in CDMA communications The technology in this application spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmente... | 01/04/2011 |
| 7864662 | Telecommunication system and method An arrangement for use in a telecommunication system includes a binder of subscriber lines, a local transceiver circuit, and a far-end crosstalk cancellation circuit. Each of the subscriber lines ends at one of a plurality of remote user terminals. The local transce... | 01/04/2011 |
| 7864661 | Time-switched preamble generator, method of generating and multiple-input, multiple-output communication system employing the generator and method The present invention is directed to a time-switched preamble generator and method of generating a time-switched preamble for use with a multiple-input, multiple-output (MIMO) transmitter employing first and second transmit antennas. In one embodiment, the time-swit... | 01/04/2011 |
| 7864664 | Delay profile generator A delay profile generator that includes a delay profile generating component, a delay profile extracting component, an integrating component, a comparing component and a correcting component, is provided. The integrating component, in the delay profile extracted by ... | 01/04/2011 |
| 7859990 | Methods and systems for performing channels estimation in a wireless communication system The invention provides methods and systems for channel estimation. A method comprises receiving a plurality of signal frames, comprising at least a first zone and a second zone, from a plurality of base stations in the wireless communication system. Two or more firs... | 12/28/2010 |
| 7848220 | System for modeling digital pulses having specific FMOP properties A system samples data of a digital pulse. The system includes a processor, an integrator, and a converter. The processor computes a discrete Fourier transform of frequency data of the digital pulse. The discrete Fourier transform includes a first output. The integra... | 12/07/2010 |
| 7848221 | Method and system for detecting adjacent channel interference from OFDM/OFDMA based broadband wireless access Disclosed are a method and system for detecting adjacent channel interference between two systems having neighboring frequencies. The method and system calculates a Fast Fourier Transform (FFT) output for one or more upper and lower frequency side null subcarriers a... | 12/07/2010 |
| 7843806 | Apparatus and methods for estimating and compensating sampling clock offset An apparatus for sampling clock recovery (SCO) and methods for estimating and compensating SCO are provided. The apparatus comprises a symbol timing adjustment module for shifting forward or backward symbol timing of the transmitted OFDM symbols; a discrete Fourier ... | 11/30/2010 |
| 7839763 | Radio transmission device, radio reception device, radio transmission method, and radio reception method Disclosed is a radio transmission device for lightening the waveform distortion of a received signal in a single-carrier transmission irrespective of a fading state. In this device, an FFT unit (103) converts a modulation signal outputted from a modulation un... | 11/23/2010 |
| 7830783 | Method and circuit for reducing the crest factor The invention relates to a method for reducing the crest factor, comprising the following method steps: (a) IFFT transformation of a data symbol to be transmitted; (b) looking for all peak values within a frame of the IFFT-transformed data ... | 11/09/2010 |
| 7821916 | Timing and frequency acquisition for mediaflo systems An apparatus, logic, and method of performing timing and frequency estimation in a MediaFLO™ mobile multimedia multicast system comprising a receiver and a transmitter, wherein the method comprises receiving a wireless data stream comprising a MediaFLO™ mobile m... | 10/26/2010 |
| 7821917 | Method and apparatus for data and pilot structures supporting equalization Techniques for transmitting data in a manner to facilitate equalization at a receiver are described. Guard intervals are appended to data blocks such that each data block has a guard interval at the beginning of the data block and a guard interval at the end of the ... | 10/26/2010 |
| 7808886 | Pilot signal in an FDMA communication system Methods (500, 800) and corresponding systems (100, 200, 300, 400, 900) for generating a pilot symbol (330) include providing an M-point parallel transform sequence that is a discrete Fourier transform of a CAZAC sequence (312, 504-508 | 10/05/2010 |
| 7804764 | Transmitter and receiver The transmitter of one embodiment of the present invention includes: a S/P section for converting original serial data to parallel data which will correspond to a plurality of subcarriers; and a second IFFT section for converting the parallel data from the frequency... | 09/28/2010 |
| 7804765 | High rate OFDM communications with a variable cyclic prefix Messages transmitted between a receiver and a transmitter are used to maximize a communication data rate. In particular, a multicarrier modulation system uses messages that are sent from the receiver to the transmitter to exchange one or more sets of optimized commu... | 09/28/2010 |
| 7796498 | Weighted tone reservation for OFDM PAPR reduction A weighted tone reservation (WTR) method and system are disclosed, for PAPR reduction. The WTR method solves the peak re-growth problem with minimum overhead. By avoiding the drawbacks of conventional tone reservation approaches, systems employing the WTR method may... | 09/14/2010 |
| 7778153 | Method for estimating transmission delay and receiver using the same There is provided a receiver for processing a ranging channel. The receiver includes a Fourier transformer for transforming a received signal into a frequency domain signal, a ranging channel extraction and ranging code elimination unit for extracting a ranging chan... | 08/17/2010 |
| 7756006 | Communication device In a communication device for receiving signals from devices that become communication partners, received signals from the respective devices are identified. Each of the devices that become communication partners is provided with a frequency spectrum of a pattern sp... | 07/13/2010 |
| 7756007 | Method to improve channel estimate in broadband SIMO/MIMO cellular radio networks during abrupt interference variations A channel response matrix gathering all unknown elements for all K pilot subcarriers on links between transmitting and receiving antennas, is Least Squares (full-rank) estimated. The interference covariance matrix is estimated from the residual. The correlation of t... | 07/13/2010 |
| 7751309 | WIC and LIC estimation in MediaFLO systems An apparatus and method for WIC/LIC estimation without channel mode construction in a MediaFLO™ system comprising a receiver, a transmitter and transmission channel, wherein the method comprises receiving a signal comprising a MediaFLO™ mobile multimedia multica... | 07/06/2010 |
| 7729238 | Method for adjusting FFT window positioning in MB-OFDM UWB system Provided is a method for adjusting Fast Fourier Transform (FFT) window positioning in a Multi Band Orthogonal Frequency Division Multiplexing Ultra-Wideband (MB-OFDM UWB) system. The method includes the steps of acquiring an initial FFT window position and a frequen... | 06/01/2010 |
| 7715305 | Data detection method and receiver A method of recovering data for use in a receiver that simultaneously receives a plurality of code division multiple access data signals, each data signal experiencing a similar channel response. A combined signal over the shared spectrum in a time slot is received ... | 05/11/2010 |
| 7710858 | Apparatus, system, and method for sample timing synchronization in a receiver A FFT module for a baseband processor of a receiver includes an input for receiving a timing window correction signal. In response to the timing window correction signal the FFT module adjusts a timing window for processing groups of samples within an input queue of... | 05/04/2010 |
| 7701841 | OFDM demodulating apparatus and method An orthogonal frequency division multiplexing (OFDM) demodulating apparatus includes a delay profile creating section, a Fourier converting section, a pilot signal extracting section, a transmission path characteristic estimating section, an inverse Fourier converti... | 04/20/2010 |
| 7701842 | Low conversion rate digital dispersion compensation A method of suppressing effects of aliasing in a system for digitally processing a high speed signal having a symbol rate of 1/T. The high speed signal is sampled at a fractional multiple (N) of the symbol rate, wherein 1 | 04/20/2010 |
| 7697414 | System and method for achieving crest factor reduction for multi-carrier modulation in a wireless communication network A system and method for achieving crest factor (CF) reduction for multi-carrier modulation in a wireless communication network (100), such as an ad-hoc peer-to-peer multi-hopping mobile wireless communication network (100). The system and method use th... | 04/13/2010 |
| 7688711 | Method and apparatus for transforming a digital audio signal and for inversely transforming a transformed digital audio signal A known time domain to frequency domain or frequency domain to time domain transform used in audio codecs is MDCT, which has the disadvantage of being costly in terms of required computational power due to high-precision multiplications, but which facilitates overla... | 03/30/2010 |
| 7684312 | Method and apparatus for fast FFT processing of paging information A method and corresponding apparatus for fast FFT processing of paging information includes receiving an analog signal that is converted to a first digital signal and digitally filtered through a first filter having a first bandwidth (BWA) to obtain a sec... | 03/23/2010 |
| 7684313 | System and method for FFT window timing synchronization for an orthogonal frequency-division multiplexed data stream A system and method for determining an FFT window location for reception of an OFDM signal received over a transmission channel. The OFDM signal includes a plurality of symbols each having a guard interval. The system includes a correlation module that determines a ... | 03/23/2010 |
| 7675847 | Hardware implementation of a programmable FFT based on a half length FFT core A method of designing a IEEE 802.11n modem starting from a IEEE 802.11a/g modem using a programmable FFT (Fast Fourier Transform) based on a half length FFT core, modifies data in a reception chain implemented in a IEEE 802.11n standard application. The method uses ... | 03/09/2010 |
| 7675846 | Method and system for using the synchronization channel to obtain measurements in a cellular communications system A method and apparatus that utilizes the synchronization channel (SCH) by the user equipment (UE) to obtain time synchronization information and to perform cell search. In order to perform the SCH detection, only a correlation between the known SCH signal and the re... | 03/09/2010 |
| 7672221 | Radio receiver and radio signal receiving method An OFDM receiver includes a timing error detection unit that determines error information based on a difference between receiving timing of a desired signal from a counterpart transmitter and receiving timing of an undesired signal from a non-counterpart transmitter... | 03/02/2010 |
| 7652981 | Orthogonal frequency multi-carrier transmission device and transmission method Symbols converted by a serial-to-parallel converting part (12) from serial to parallel form are subjected to inverse Fourier transform processing in an inverse Fourier transform part (13) as sub-carrier signal components of a frequency interval equal t... | 01/26/2010 |
| 7626923 | Method and apparatus of the variable points IFFT/FFT Provided are a method and apparatus for performing a variable point Inverse Fast Fourier Transform (IFFT)/Fast Fourier Transform (FFT). The apparatus for performing a variable point IFFT includes: an IFFT interpolator generating interpolation data signals having a d... | 12/01/2009 |
