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Class Information
Number: 375/142
Name: Pulse or digital communications > Spread spectrum > Direct sequence > End-to-end transmission system > Having correlation-type receiver
Description: Subject matter in which transmitted signals are recovered using a structure or method that compares a transmitted spreading code sequence with a local spreading code sequence, generally by multiplicative means.

Patents under this class:
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Patent Number Title Of Patent Date Issued
7697597 Apparatus for calculating decision parameters in an IMT-2000 system Apr. 13, 2010
7697596 Cluster path processor time alignment for signal suppression/separation in a wireless device Apr. 13, 2010
7697593 Multiple-input multiple-output (MIMO) timing synchronization using correlation with first and second known signal Apr. 13, 2010
7697590 Communicating apparatus and communicating method Apr. 13, 2010
7693210 Hybrid rake/equalizer receiver for spread spectrum systems Apr. 6, 2010
7684466 Wired spread spectrum communication device, a method for communication thereof, and a wired spread spectrum communication system Mar. 23, 2010
7684472 Method and apparatus for frequency-robust detection of a wideband code division multiple access secondary synchronization channel Mar. 23, 2010
7684474 Method and apparatus for demodulating signals processed in a transmit diversity mode Mar. 23, 2010
7680221 Ultratight navigation observation lock detector Mar. 16, 2010
7680223 Reducing memory usage in noncoherent signal processing Mar. 16, 2010
7672415 System and method for detecting a presence and frequency offset of a spread spectrum radio frequency signal Mar. 2, 2010
7672404 Method and apparatus for reducing the time required to acquire a GPS signal Mar. 2, 2010
7672361 System and method for despreading in a spread spectrum matched filter Mar. 2, 2010
7672358 Method and apparatus for performing signal correlation at multiple resolutions to mitigate multipath interference Mar. 2, 2010
7664165 Correlation apparatus based on symmetry of correlation coefficient and method thereof Feb. 16, 2010
7656934 Wireless communications system with secondary synchronization code based on values in primary synchronization code Feb. 2, 2010
7653118 Chirped surface acoustic wave (SAW) correlator/expander Jan. 26, 2010
7653121 Power level measuring device and a mobile station Jan. 26, 2010
7653164 Adaptive IQ imbalance correction for multicarrier wireless communication systems Jan. 26, 2010
7649936 Device and method for determining a correlation maximum Jan. 19, 2010
7646802 Communication receiver with hybrid equalizer Jan. 12, 2010
7643536 Asynchronus communication system for remote monitoring of objects or an environment Jan. 5, 2010
7643537 Spread spectrum signal detection with inhibiting for known sidelobe locations Jan. 5, 2010
7639729 Channel estimation method and apparatus using fast fourier transforms Dec. 29, 2009
7639730 Methods and apparatus for improving signal timing accuracy Dec. 29, 2009
7636382 Encoding Viterbi error states into single chip sequences Dec. 22, 2009
7636384 Method for detecting the orthogonal code CDMA signal Dec. 22, 2009
7633996 Method and device for determining the occupancy of a transmission channel Dec. 15, 2009
7630445 Establishing slot boundaries of slots of a diversity control feedback signal Dec. 8, 2009
7630447 System of communication between synchronized submarine devices Dec. 8, 2009
7630690 Access burst detector correlator pool Dec. 8, 2009
7627059 Method of robust timing detection and carrier frequency offset estimation for OFDM systems Dec. 1, 2009
7623562 Initial synchronization acquiring device and method for parallel processed DS-CDMA UWB system and DS-CDMA system's receiver using the same Nov. 24, 2009
7623566 Method and apparatus for demodulating signals processed in a transmit diversity mode Nov. 24, 2009
7623583 Apparatus and method for tracking a sampling clock of multi-carrier communication system Nov. 24, 2009
7620099 WCDMA terminal baseband processing module having multi-path scanner module Nov. 17, 2009
7616717 Coarse timing synchronization Nov. 10, 2009
7616715 Method and system for estimating the speed of a mobile device in a network Nov. 10, 2009
7613227 Reverse link correlation filter in wireless communication systems Nov. 3, 2009
7613258 Apparatus and method for determining GPS tracking loop parameter based on SNR estimation Nov. 3, 2009
7609751 Method and apparatus to initiate communications between an unknown node and an existing secure network Oct. 27, 2009
7606292 Sub-sequence accumulation filter and method Oct. 20, 2009
7602834 System and method for determining a fine frequency offset of a received signal Oct. 13, 2009
7602835 Multi-rate spread spectrum composite code Oct. 13, 2009
7599425 Multiple channel joint decoding at mobile handset Oct. 6, 2009
7599421 Spread spectrum applications of universal frequency translation Oct. 6, 2009
7599344 Method and apparatus for reducing multi-user processing in wireless communication systems Oct. 6, 2009
7596167 Allocation method, network element, module and user device Sep. 29, 2009
7596168 Diversity receiving apparatus, controlling method of the same, and computer-readable medium containing program therefor Sep. 29, 2009
7596170 Coherent detection without transmission preamble Sep. 29, 2009

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