Resources Contact Us Home
Browse by Category: Main > Communications
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:

Patent Number Title Of Patent Date Issued
6304545 Method and circuit arrangement for the correction of phase and/or frequency errors in digital multicarrier signals Oct. 16, 2001
6304611 OFDM modulator and OFDM modulation method for digital modulated wave having guard interval Oct. 16, 2001
6301221 Methods and apparatus for encoding data Oct. 9, 2001
6298037 Network data filtering Oct. 2, 2001
6295272 Subchannel modulation scheme for carrying management and control data outside the regular data channel Sep. 25, 2001
6292462 Multicarrier modulation Sep. 18, 2001
6289099 Ringer for satellite user terminals Sep. 11, 2001
6269132 Windowing function for maintaining orthogonality of channels in the reception of OFDM symbols Jul. 31, 2001
6262972 Digital multitone communication trunk Jul. 17, 2001
6240062 Fast fourier transform calculating apparatus and fast fourier transform calculating method May. 29, 2001
6226337 Method for the transmission of reference signals in an OFDM system May. 1, 2001
6219334 Receiving apparatus for receiving orthogonal frequency division multiplexing signal and receiving method thereof Apr. 17, 2001
6201785 Process for transmitting a digitized signal according to OFDM type multicarrier modulation, transmitter and receiver for the implementation of the said process Mar. 13, 2001
6195328 Block adjustment of synchronizing signal for phase-coded signal tracking Feb. 27, 2001
6185182 Power sharing amplifier system for a cellular communications system Feb. 6, 2001
6181258 Receiver capable of parallel demodulation of messages Jan. 30, 2001
6175551 Transmission system and method employing peak cancellation to reduce the peak-to-average power ratio Jan. 16, 2001
6169723 Computationally efficient analysis and synthesis of real signals using discrete fourier transforms and inverse discrete fourier transforms Jan. 2, 2001
6167093 Method and apparatus for encoding the information, method and apparatus for decoding the information and method for information transmission Dec. 26, 2000
6160791 Transmission system for the transmission of power control information in an OFDM system Dec. 12, 2000
6154443 FFT-based CDMA RAKE receiver system and method Nov. 28, 2000
6148007 Method for data transmission in a digital audio broadcasting system Nov. 14, 2000
6148024 FFT-based multitone DPSK modem Nov. 14, 2000
6137839 Variable scaling of 16-bit fixed point fast fourier forward and inverse transforms to improve precision for implementation of discrete multitone for asymmetric digital subscriber loops Oct. 24, 2000
6122247 Method for reallocating data in a discrete multi-tone communication system Sep. 19, 2000
6118758 Multi-point OFDM/DMT digital communications system including remote service unit with improved transmitter architecture Sep. 12, 2000
6118794 Digital signal processing apparatus for frequency demultiplexing or multiplexing Sep. 12, 2000
6115354 Multiple carrier transmission in common-wave networks Sep. 5, 2000
6111855 Method and apparatus for baud detection in a communication device Aug. 29, 2000
6111919 Synchronization of OFDM signals Aug. 29, 2000
6091702 Method and apparatus for symbol synchronization in orthogonal frequency division multiplexing systems Jul. 18, 2000
6091703 Bulk despreading of multiple independent CDMA sources Jul. 18, 2000
6091704 Digital multi-channel demultiplexer/multiplexer (MCD/M) architecture Jul. 18, 2000
6092093 Multiplexer device for frequency bands Jul. 18, 2000
6088327 Method and circuit arrangement for improving carrier separation for the transmission of OFDM signals Jul. 11, 2000
6088398 Orthogonal frequency division multiplex systems Jul. 11, 2000
6084886 Method and apparatus for facilitating establishment of communications in a messaging system Jul. 4, 2000
6081502 Method and apparatus for reducing probability of clipping Jun. 27, 2000
6072769 Method for multitone division multiple access communications Jun. 6, 2000
6046977 Method and apparatus for detecting signal misalignment Apr. 4, 2000
6031879 Wideband undersampling digital receiver Feb. 29, 2000
6021110 OFDM timing and frequency recovery system Feb. 1, 2000
6014366 Variable-bandwidth frequency division multiplex communication system Jan. 11, 2000
6005900 Wideband channelization using subsampled discrete fourier transforms Dec. 21, 1999
6002664 Method to gain access to a base station in a discrete multitone spread spectrum communications system Dec. 14, 1999
5999573 Wideband channelization with variable sampling frequency Dec. 7, 1999
5995484 Technique for obtaining checksum in a fast fourier transformation network Nov. 30, 1999
5987005 Method and apparatus for efficient computation of discrete fourier transform (DFT) and inverse discrete fourier transform Nov. 16, 1999
5970047 Communications method, communication apparatus, reception method, and reception apparatus Oct. 19, 1999
5963592 Adaptive channel equalizer for use in digital communication system utilizing OFDM method Oct. 5, 1999

  Recently Added Patents
Ultra-wideband communication system and method
Systems and methods for programming an RFID reader
Micro positioning test socket and methods for active precision alignment and co-planarity feedback
High-resolution ranging and location finding using multicarrier signals
Adaptive period network session reservation
Amplitude-shift-keying (ASK) envelope detector and demodulation circuits
Method for growing group III-nitride crystals in supercritical ammonia using an autoclave
  Randomly Featured Patents
Application of active mass to porous electrode support structures
Method for making polycarbonate
Assembly for cable conduits of workstation furniture
Modular electrical box mounting system
Apparatus and methods for parallel processing of micro-volume liquid reactions
Articulating mechanism for steerable surgical cutting instruments
Body massager
Hybrid protective composite
Striding exerciser with adjustable upwardly curved tracks