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6263031 |
Method and apparatus for signal burst classification
A burst classifier is useful in a digital communication system transmitting a signal burst of a plurality of different burst types. The burst classifier includes a plurality of filters associated...
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6263009 |
Acquiring a spread spectrum signal
A spread spectrum signal is detected at an unknown spreading signal phase by sampling the signal at a selected sampling rate and performing a despreading function on the sampled signal using...
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6256338 |
Method for determining fading correction factor in a communication system
A method for determining a fading correction factor to be used for correcting a sample of a power delay profile of a received signal in a communication system, the fading correction factor...
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6252899 |
Complex despreading system
A compact and easily-assembled circuit for a complex despreading system, arranged such that the circuit does not contain pairs of adders at the output area. The configuration of the circuit enables...
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6246714 |
Synchronization circuit with correlated signal in the direct spread spectrum telecommunication system
A synchronization circuit with correlated signal is capable of generating synchronizing signals to provide a stable correlated signal when correlation processing is conducted by digital sampling...
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6240081 |
Multicode CDMA transmitter with improved signal processing
CDMA communication over multiple channels by phase shifting at baseband and then RF modulating without a phase shift. Total number of baseband filters is reduced by summing channel components prior...
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6233271 |
Method and apparatus for decoding trellis coded direct sequence spread spectrum communication signals
A method and an apparatus for decoding trellis coded direct sequence spread spectrum communication signals are provided. A transmitted QPSK signal is received. Binary phase-shift keyed (BPSK)...
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6229839 |
Method and apparatus for time tracking
In order to time track an incoming signal, a receiver demodulates a first instance of a signal to produce a first set of energy values corresponding to a set of possible data values of the signal....
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6226282 |
Method of searching reverse traffic channels in a CDMA mobile radio communication system
A method of searching reverse traffic channels in a code division multiple access (CDMA) mobile radio communication system for allowing for acquisition of reverse traffic channels without increase...
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6215811 |
Store and dump, spread-spectrum handoff
A system and method for handing off a remote unit from a first base station to a second base station, in a cellular spread-spectrum communications network, without loss of data. The remote unit...
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6212223 |
Demodulation and correlation for spread spectrum communications
In a spread spectrum communications system, method and apparatus are provided for reducing transmission error and power consumption despite an increase in sampling. There are serially provided 4k...
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6212219 |
Spread spectrum communication system
The present invention has an object to provide a spread spectrum communication system for heightening the speed of communication. The present invention transfers the first PN code sequence itself...
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6208291 |
Highly parallel GPS correlator system and method
A method and apparatus of acquiring and tracking satellite positioning system signals in a highly parallel correlator disclosed. A pseudo-random noise correlation operation is performed on an input...
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6205167 |
Apparatus and method for code tracking in an IS-95 spread spectrum communications system
A pseudo-noise generator (516) generates an on-time component, an early component and a late component of a pseudo-noise code signal in response to an error signal. The on-time component is routed...
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6205168 |
Sequential detection system and method with adaptive bias
An adaptive CDMA sequential detection method is provided. The method permits the use of the sequential detection process to determine an unknown spreading code in an environment where the signal to...
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6188679 |
CDMA chip synchronization circuit
A CDMA chip synchronization circuit is provided for a mobile communications system employing a wide band CDMA method, for example, a direct spread code division multiple access (DS-CDMA) method....
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6188714 |
Parallel M-sequence generator circuit
A parallel M-sequence generator is disclosed which outputs an identical bit stream of a serial M-sequence generator of equal chip length. In a parallel N-bit implementation, the first N bits of the...
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6181730 |
Pull-in circuit for pseudo-random pattern
A pull-in circuit of the present invention which can shorten the time of the pull-in operation. The pull-in circuit comprises: a pseudo-random pattern operating circuit for operating an operated...
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6178193 |
Spread spectrum receiver and transmission power control method
In a spread spectrum receiver, when a preliminarily set integration period for integrating a correlated power of a received signal is significantly offset with respect to a fading period, accurate...
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6163566 |
Spread spectrum transmitter, spread spectrum receiver, and spread spectrum communications system
A spread spectrum communications system is provided for reducing the number of required matched filters to simplify the configuration associated with the reception. In a spread spectrum...
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6151353 |
Pre-acquisition frequency offset removal in a GPS receiver
A direct sequence spread spectrum receiver samples an incoming signal and stores the sample in memory. Prior to sampling and storage, the incoming signal is translated to an IF signal. Also prior...
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6147982 |
System and method for synchronizing acquisition for a code modulated communication system
A system and method for a synchronizing acquisition of a transmitted signal with a local code in a code modulated communication system. The local code is comprised of a replica of the transmitted...
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6144691 |
Method and apparatus for synchronizing to a direct sequence spread spectrum signal
A method for synchronization of a receiver to a direct sequence spread spectrum (DS-SS) signal in a telecommunications system. A verification process is performed in the receiver upon initial...
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6134262 |
Spread spectrum receiving apparatus
A receiving apparatus is disclosed which comprises: a receiving circuit for receiving a radio wave signal including a pilot signal and data signal respectively spectrum-spread and converting the...
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6122310 |
Method and apparatus for facilitating multi-rate data transmission by selecting a plurality of spreading codes
A communication system facilitates multi-rate data transmission by using a set (N) (210) of spreading codes from which a subset (n) (214) of the spreading codes is dynamically selected based on a...
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6118807 |
Methodology for received signal enhancement utilizing delay diversity processing
A delay diversity processor for use in receiving direct sequence spread spectrum data utilizes multipath signals to enhance bit synchronization performance by integrating the magnitude of each...
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6118808 |
GPS receiver with efficient signal acquisition
A direct sequence spread spectrum receiver samples an incoming signal and translates the signal to an IF signal. The IF signal is sampled and stored in memory. In one embodiment, the memory...
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6111910 |
Maximal correlation symbol estimation demodulator
A maximal correlation symbol estimation (MCSE) method for estimating the symbols that are modulating an information signal component of a received signal, which can be applied to received signals...
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6104747 |
Method for determining optimum number of complex samples for coherent averaging in a communication system
A method for determining an optimum number (Nopt) of complex samples for coherent averaging of a complex signal S(n) in a code division multiple access communication system includes estimating an...
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6094449 |
Spread spectrum communication synchronization acquisition decoding apparatus
According to a spread spectrum communication synchronization acquisition demodulating apparatus which can acquire synchronization timing and immediately track variation of the synchronization...
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6094450 |
Spread spectrum chip shift keying modulation/demodulation system and method
A modulation/demodulation system and method comprising transmitting structure having first and second PN generators which produce distinct, synchronized, first and second PN sequences. A tapped...
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6091761 |
Despreading method and arrangement in communication system
The invention relates to a method and an arrangement for implementing a bank of correlators, corresponding to a set of Orthogonal Gold codes, in a receiver used in a Direct Sequence Code Division...
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6088382 |
Cell search circuit for CDMA
A cell search circuit which does not invite an increase in search time, even if coherent integration is performed, and which minimizes an increase in the scale of the circuitry. The circuit...
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6075807 |
Windowed digital matched filter circuit for power reduction in battery-powered CDMA radios
A digital matched filter for a CDMA radio comprises a digital delay line having a plurality of successive delay stages adapted to receive a digital signal and propagate the digital signal...
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6069912 |
Diversity receiver and its control method
Enabling reception quality to be improved and the capacity in terms of the number of simultaneous users in a cell to be increased, and speeding up the establishment of spreading code...
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6069915 |
Randomized code acquisition
A code acquisition circuit for acquiring code synchronization between an n-chip spreading code of a received spread spectrum radio signal and an n-chip local reference code generated by a code...
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6067313 |
Wireless communications system for transmitting and receiving data with increased data rates and robustness
A data communications system for conveying a series of input data symbols includes a transmitter subsystem and a receiver subsystem. The transmitter subsystem generates a series of composite...
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6061387 |
Method and system for turbo-coded satellite digital audio broadcasting
A system and method for broadcasting an audio signal in a turbo-coded satellite digital audio broadcasting system is provided that utilizes the combination of a turbo coding system having code...
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6055265 |
Apparatus for receiving GPS signals by utilizing non-coherent DLL
GPS satellite signals are received, and a C/A code is synchronized by utilizing the non-coherent DLL so as to remove the unique code of the GPS satellite. There are generated 1/2-bit lagging,...
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6055264 |
Method and apparatus for fast acquisition and multipath search in a spread spectrum system
Early and on-time signals are generated from a received CDMA signal for each PN code phase being searched, and the early and on-time signals are each divided into a number of subdwells sequentially...
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6052408 |
Cellular communication system with dynamically modified data transmission parameters
An apparatus and process for improving the performance of a cellular communication system using direct sequence spread spectrum techniques is disclosed. The apparatus and process enable dynamic...
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6044083 |
Synchronous code division multiple access communication system
In a synchronous code division multiple access (SCDMA) system, a set of substantially orthogonal code words is selected such that each code word in the set of substantially orthogonal code words is...
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6044104 |
Cell search method and mobile station apparatus
Search control means 8 of a mobile station apparatus divides a search window received into a number of search widths corresponding to the number of search correlators 3 and makes each of...
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6002711 |
Spread spectrum communication system for error compensation of carrier frequency
A transmitter and a receiver of a spread spectrum communication system for compensating carrier frequency offsets between the transmitter and the receiver. The transmitter includes: a first...
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5995537 |
Synchronism acquisition method and apparatus for correlation demodulation
A method for synchronism acquisition between a spread code sequence at a transmission side and a despread code sequence at a reception side in spread spectrum (SS) communication such as a direct...
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5995538 |
Spread spectrum multipath processor system and method
A spread-spectrum system and method for providing high capacity communications through multipath compensation. A multipath processor including a first plurality of correlators, a second plurality...
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5963586 |
Method and apparatus for parallel noncoherent correlation of a spread spectrum signal
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals. A transmitter divides a signal data stream into a plurality of data streams...
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5949817 |
Multi-level correlation system for synchronization detection in high noise and multi-path environments
A multi-level correlation technique and apparatus for detecting symbol and data frame synchronization in high noise and multi-path environments, wherein received signals are correlated with known...
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5936950 |
Data transmission method, reception method, and receiver
A a data transmission and reception method and a receiver in which signals transmitted by various multiple access methods are processed. Signals transmitted by various multiple access methods can...
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5937001 |
Range safety communication system and method utilizing pseudorandom noise sequences
A system and method for transmitting one or more range safety commands to a launch vehicle which includes transmitting structure having a pilot code generator and at least one additional code...
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