Matches 451 - 500 out of 554 < 1 2 3 4 5 6 7 8 9 10 11 12 >
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5920555 Pilot assisted direct sequence spread spectrum synchronization apparatus  
The invention relates to pilot assisted direct sequence spread spectrum links. Fine code synchronization generally requires either multiple receiver correlators (early/prompt/late) or jittered...
5862172 Spread spectrum communication system and its transmitter and receiver  
A spread spectrum communication system, which can detect the synchronization of the spread code surely even when the carrier-to-noise ratio is low, and can detect the boundary of the data. Wherein...
5841807 Spread spectrum data communicator  
In summary, the spread spectrum direct sequence communication system of the present invention has a plurality of transmitters for uni-directionally simultaneously transmitting, through a...
5832022 Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals  
A transceiver uses feedback control to monitor a transmitted continuous phase modulation (CPM) waveform, such as a spread spectrum CPM waveform, and adjust the modulation index in response thereto....
5812592 Spread spectrum communication apparatus utilizing a phase difference between two signals  
A spread spectrum reception apparatus generates a local reference code and a timing signal having 1/2 the period of the reference code. Correlation calculation between a received spread spectrum...
5790591 Spread spectrum transmitter and communications system using multiple spreading codes  
A spread spectrum transmitter for generating a plurality of spread spectrum codes comprises a shift register having a plurality of stages, with a plurality of tap sets connected to selected ones of...
5790537 Interference suppression in DS-CDMA systems  
A code division multiple access (CDMA) communications system comprises a plurality of CDMA transmitters and at least one reception station coupled together by a communications channel. Each CDMA...
5774493 Sequence constructions for delay-and-correlate transmitted reference signaling  
A direct conversion receiver for delay-and-correlate transmitted reference spread spectrum signaling apparatus improves the performance of a delay-and-correlate transmitted reference spread...
5774492 Low-complexity direct conversion receiver for delay-and-correlate transmitted reference signaling  
A direct conversion receiver for a delay-and-correlate transmitted reference spread spectrum signaling method and apparatus is based on minimal component digital circuitry instead of analog delay...
5754584 Non-coherent spread-spectrum continuous-phase modulation communication system  
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A spread spectrum transmitter includes a chip sequence generator for...
5692007 Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation  
A method and apparatus for phase encoding and decoding a CPM spread spectrum signal. A transmitter divides a data stream into a data symbol portion and an associated phase information portion. The...
5687190 Non-coherent direct sequence spread spectrum receiver for detecting bit/symbol chip sequences using threshold comparisons of chip sequence correlations  
A method and apparatus for transmitting and receiving a direct sequence spread spectrum signal encoded using two or more chip sequences to encode an information signal. The encoded information...
5668829 Spread spectrum communication apparatus  
A spread spectrum communication apparatus comprises a correlator for correlating a received signal and a reference signal, a synchronizing circuit for synchronizing codes for spread spectrum...
5659573 Method and apparatus for coherent reception in a spread-spectrum receiver  
A method and apparatus is provided for facilitating coherent communication reception. A received reference symbol coded spread spectrum communication signal is despread with a spreading code to...
5654979 Cell site demodulation architecture for a spread spectrum multiple access communication systems  
An integrated demodulation processor used in a modem for a spread spectrum communications system despreads multipath receive signals then uses a time sliced transform processor to process the...
RE35574 Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation  
A communication device, an apparatus, and a method for acoustic echo cancellation which makes use of a pseudonoise signal. An audio mixer adds the pseudonoise signal to an input signal received...
5615227 Transmitting spread spectrum data with commercial radio  
A transmitter prepares digits for transmission, e.g. as spread spectrum data accompanying commercial radio, using code sequences having exactly zero cross-correlation. The code sequences include...
5610938 Spread spectrum communication system having a minimized bit error rate  
A clock rate modulation spread spectrum (CRM-SS) communication system is provided in which a bit error rate on a receiver side is minimized by controlling at least one of parameters defining a...
5602833 Method and apparatus for using Walsh shift keying in a spread spectrum communication system  
Method and apparatus for generating orthogonally encoded communication signals for communication system subscribers using multiple orthogonal functions for each orthogonal communication channel....
5596571 CDMA radiotelephone having optimized slotted mode and long code operation  
A radiotelephone (10) capable of operation within a CDMA radiotelephone system. The radiotelephone includes a receiver (30) for receiving a paging channel transmission; a system time pseudonoise...
5581575 Method and apparatus for transmission of variable rate digital data  
A communication system for transmitting variable rate data is disclosed wherein redundancy is added to the variable rate data to provide repetition symbols. The repetition symbol data is...
5581547 Random access communication method by CDMA and mobile station equipment using the same  
Mobile stations randomly set delay amounts for each message to be sent, on the basis of the timing of a symbol received from a base station, and delay transmission signals for time intervals...
5563907 Variable bandwith spread spectrum device and method  
A variable bandwidth filter device for use with a spread-spectrum transmitter including a chipping sequence generator, spread-spectrum processing means, an impulse generator, and a filter. The...
5550810 Direct sequence code division multiple access (DS-CDMA) communication system and a receiver for use in such a system  
A DS-CDMA system comprises at least one transmitter and at least one receiver operating on a dedicated signal channel which is used by other DS-CDMA operators in a non-synchronous way. A receiver...
5537397 Spread aloha CDMA data communications  
Multiple transmitters transmit data signals using identical spreading codes. A single matched filter of a receiver receives all the signals. A broadcast timing control signal retards or advances...
5535237 Method and system for a multi channel and search global position system signal processor  
There is disclosed a multi channel GPS digital signal processor on a single IC. Each channel contains circuitry to process L1 or L2 P(Y) and C/A-code signals. In addition a search processor is...
5515396 Method and apparatus for selecting a spreading code in a spectrum spread communication system  
A communication system utilizes multiple spreading codes to transmit high data rate information. The system codes high data rate user information (201) and partitions the coded information (202)...
5511090 Wireless frequency-division-multiple-access direct sequence spread spectrum telephone system  
A cordless, battery-operated telephone of relatively low power consumption suitable to operate in license-exempt spectrum and which may employ an established communication protocol, such as the...
5504775 Multi-user spread spectrum communication system  
Multi-user communication system which combines means that implement the spread spectrum coding technique SSC with means that implement the modulation technique of orthogonal frequency-division...
5500856 Transmission de-correlator for eliminating interference in a CDMA communication system  
A base station of a CDMA communication system includes a transmission de-correlator for eliminating interferences between communication channels of a downlink. The transmission de-correlator has a...
5497395 Method and apparatus for modulating signal waveforms in a CDMA communication system  
An improved system and method for transmitting information within a digital communication system is disclosed herein. A modulation system for use in a digital cellular communication system is...
5493612 Secure communication keying system  
The secure communication keying system has a noise generator whose output a predetermined finite band of noise within, for example, the zero to eleven hundred cycle per second range. The noise...
5487083 Hand-off method and mobile station for spread spectrum mobile communication  
Radio zones 2a through 2d are each assigned radio frequency channels of the number corresponding to the zone traffic, one frequency f1 of the radio frequency channel is assigned in common to all...
5471497 Method and apparatus for variable rate signal transmission in a spread spectrum communication system using coset coding  
An improved system and method for communicating information at variable data rates over in-phase (I) and quadrature phase (Q) communication channels in a CDMA spread spectrum communication system...
5469470 Spread spectrum communication system using two-predetermined-code pseudo-noise signals  
A transmission terminal modulates, for a first state of given data signal, a non-return-to-zero code pseudo-noise signal onto a carrier band. Further, the terminal modulates, for a second state of...
5467367 Spread spectrum communication apparatus and telephone exchange system  
A telephone exchange system of this invention has a terminal connected to an extension by radio. As a radio communication modulation method, a spread spectrum method is used. A speech signal...
5454005 Reciprocal mode saw correlator method and apparatus  
A surface-acoustic-wave correlator for decoding a spread-spectrum signal having a data signal modulated with a plurality of chip sequences and reciprocal-chip sequences. A tapped-delay-line has a...
5452328 Technique for generating sets of binary spreading-code sequences for a high data-rate spread-spectrum network  
A method and apparatus for electrically generating sets of binary spreading-code sequences for use in a multi-node communication network are disclosed. A method for assigning disjoint sets of...
5442662 Code-division multiple-access communication system providing enhanced capacity within limited bandwidth  
A code-division multiple-access spread-spectrum communication system uses pairs of spreading codes with rates of N/2 chips per data symbol to provide a capacity equivalent to that obtained in a...
5434893 Component for a differential transmitter-receiver of signals with direct sequence spread spectrum and the corresponding transmitter-receiver  
The component essentially comprises two correlators (TR1, F1), (TR2, F2) shifted by one period or cycle from the information element. This component fulfils both the correlation and delay...
5414728 Method and apparatus for bifurcating signal transmission over in-phase and quadrature phase spread spectrum communication channels  
An improved system and method for communicating information over in-phase (I) and quadrature phase (Q) communication channels in a spread spectrum communication system is disclosed herein. In an...
5404375 Process and apparatus for satellite data communication  
A system for transmitting and receiving outbound and inbound data signals through a satellite communications network, the system having a network data rate and including a satellite and an end user...
5377227 Adaptive data recovery for spread spectrum systems  
A method and means for for recovering data in a spread spectrum communications system. The present invention includes a method and means for providing a sync window time period. The sync window is...
5371760 Method and apparatus for measuring the impulse response of a radio channel  
A system for measuring a multipath radio channel impulse response by cross-correlating digital samples of a received pseudo-random signal with a digital copy of the transmitted signal. A...
5359625 Spread spectrum communication system particularly-suited for RF network communication  
Spread spectrum communication using direct sequences that approximate a swept frequency waveform in which successive square waves are formed by the chips making up the sequence, and in which the...
5353300 Communication method for an adaptive direct sequence CDMA communication system  
A communication method in an adaptive CDMA communication system (100) capable of communicating a direct sequence spread spectrum communication signals which comprise bit sequences coded with...
5347537 Spread spectrum communication device  
In a spread spectrum communication system for communicating data by spreading spectrum, thereof, using PN codes, on the transmitter side, a first modulated output portion, which is...
5343495 Method of multipath dsss communications  
Method of demodulating a signal including a plurality of time-dispersed signal components such as resulting from receiving in a multipath environment. A plurality of correlators are provided. The...
5319672 Spread spectrum communication system  
A spread spectrum communication system has a plurality of transmit ends capable of simultaneous communications and at least one receive end. Each of the transmit ends modulates digital information...
5313490 Acquisition apparatus for DSSS communications  
Apparatus for indicating the end of an acquisition procedure between a transmitter and receiver in a direct sequence spread spectrum communications system. A transmitter generates a first...
Matches 451 - 500 out of 554 < 1 2 3 4 5 6 7 8 9 10 11 12 >