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Class Information
Number: 370/210
Name: Multiplex communications > Generalized orthogonal or special mathematical techniques > Fourier transform
Description: Subject matter utilizing a special mathematical relationship that provides a connection between information in the frequency domain and the time domain.










Patents under this class:
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Patent Number Title Of Patent Date Issued
7181194 Methods and systems for triggerless prepaid SMS screening and accounting in a signaling message routing node Feb. 20, 2007
7173975 Estimation of a frequency selective channel in a MIMO environment with parameters that vary within a transmission block Feb. 6, 2007
7170926 Efficient multiple input multiple output system for multi-path fading channels Jan. 30, 2007
7170860 Method and system for passively analyzing communication data based on frequency analysis of encrypted data traffic, and method and system for deterring passive analysis of communication data Jan. 30, 2007
7170849 Interleaver, deinterleaver, interleaving method, and deinterleaving method for OFDM data Jan. 30, 2007
7161896 Channel estimation in a multicarrier radio receiver Jan. 9, 2007
7158476 OFDM receiver using polar coordinate system and method thereof Jan. 2, 2007
7154848 Methods and apparatus for generating a multiplexed communication signal Dec. 26, 2006
7154847 Fast fourier transforming apparatus and method thereof for compensating for OFDM output bit signal Dec. 26, 2006
7151478 Pseudo-orthogonal waveforms radar system, quadratic polyphase waveforms radar, and methods for locating targets Dec. 19, 2006
7145961 Ultra wideband transmitter Dec. 5, 2006
7133479 Frequency synchronization apparatus and method for OFDM systems Nov. 7, 2006
7133463 Linear transformation circuits Nov. 7, 2006
7133443 Multi-tone transmission Nov. 7, 2006
7133433 Method and apparatus for enhancing data rates in spread spectrum communication systems Nov. 7, 2006
7133355 Interference suppressing OFDM method for wireless communications Nov. 7, 2006
7130293 Transmitter, transmitting method, receiver, and receiving method for MC-CDMA communication system Oct. 31, 2006
7123580 Multiple user adaptive modulation scheme for MC-CDMA Oct. 17, 2006
7116981 Apparatus and method for channel quality estimation and link adaptation in orthogonal frequency division multiplexing (OFDM) wireless communication system Oct. 3, 2006
7116745 Block oriented digital communication system and method Oct. 3, 2006
7110387 System and method for compensating timing error using pilot symbol in OFDM/CDMA communication system Sep. 19, 2006
7102755 Method for determining power of modulated signals from a frequency transformed interferogram Sep. 5, 2006
7099266 Orthogonal frequency division multiplexed signal transmitting apparatus, orthogonal frequency division multiplexed signal receiving apparatus, and orthogonal frequency division multiplexed sig Aug. 29, 2006
7099268 Orthogonal frequency division multiplex modem circuit Aug. 29, 2006
7099270 Multi-path equalization for orthogonal frequency division multiplexing communication system Aug. 29, 2006
7099396 Multicarrier modulation using weighted prototype functions Aug. 29, 2006
7099397 Receiver of an orthogonal frequency division multiplexing system Aug. 29, 2006
7099413 Method for near optimal joint channel estimation and data detection for COFDM systems Aug. 29, 2006
7095708 Methods and apparatus for use in communicating voice and high speed data in a wireless communication system Aug. 22, 2006
7095790 Transmission schemes for multi-antenna communication systems utilizing multi-carrier modulation Aug. 22, 2006
7092352 Cancellation systems for multicarrier transceiver arrays Aug. 15, 2006
7092353 Carrier search methods and apparatus Aug. 15, 2006
7088787 Post-FFT scaling to reduce multiple effects Aug. 8, 2006
7082301 Method and system for triggering handoff of a call between networks Jul. 25, 2006
7079570 Communication system with receivers employing generalized two-stage data estimation Jul. 18, 2006
7079824 Reception of multicarrier spread-spectrum signals Jul. 18, 2006
7075978 Multi-tone transmission Jul. 11, 2006
7072290 Single user detection base station Jul. 4, 2006
7072411 Computation reduction in OFDM system using frequency domain processing Jul. 4, 2006
7072419 Data communication apparatus and method based on orthogonal frequency division multiple access Jul. 4, 2006
7068593 Apparatus and method for synchronizing frequency in orthogonal frequency division multiplexing communication system Jun. 27, 2006
7061854 Efficient OFDM communications with interference immunity Jun. 13, 2006
7061997 Method and apparatus for fine frequency synchronization in multi-carrier demodulation systems Jun. 13, 2006
7058005 Method and device for transmitting hierarchical data Jun. 6, 2006
7058137 Phase shifters for peak-to-average power ratio reduction in multi-carrier communication systems Jun. 6, 2006
7058140 Sliding-window multi-carrier frequency division multiplexing system Jun. 6, 2006
7054300 Single user detection circuit May. 30, 2006
7039001 Channel estimation for OFDM communication systems May. 2, 2006
7039105 Adaptive information compression May. 2, 2006
7039137 Method for processing OFDM signals simultaneously received via a multiple antenna system May. 2, 2006

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