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| Number | Title | Issue Date |
| 5623485 | Dual mode code division multiple access communication system and method A CDMA communication system capable of operating at higher data rates with less bit errors and reduced cochannel interference facilitates coherent detection without the use of a pilot tracking signal. A transmitter in the communication system includes a c... | 04/22/1997 |
| 5602832 | Receiver device for code division multiplex communication system In a CDM (code division multiplex) communications system a base station transmits a plurality of data signals on a common channel. Each data signal is provided with a spreading sequence, e.g. a Gold code, each sequence being allocated to a user of that ch... | 02/11/1997 |
| 5592506 | MSK spread-spectrum receiver which allows CDMA operations A method for demodulating a received spread-spectrum signal using a minimum-shift-keyed (MSK) receiver. Using the method, an in-phase-component signal and a quadrature-phase-component signal are generated from a received spread-spectrum signal. The in-pha... | 01/07/1997 |
| 5586113 | CDMA communications method and system A CDMA communications method capable of multiplex transmission of data over a wide range from a low rate to high rate such as image data without a considerable increase in a circuit scale. A fundamental transmission rate is determined, for example, at 32 ... | 12/17/1996 |
| 5553062 | Spread spectrum CDMA interference canceler system and method A spread-spectrum code division multiple access interference canceler system and method for reducing interference in a spread-spectrum CDMA receiver having N chip-code channels, with each of the N channels identified by a distinct chip-code signal. The in... | 09/03/1996 |
| 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 timings of individual transmitters to offset the interleaved... | 07/16/1996 |
| 5517518 | Method and arrangement for recognition of a coded transmitted signal The present invention is for fast, reliable recognition of coded signals where the signal includes a predetermined code sequence in a lead portion thereof. This has particular application in spread spectrum transmission and receptions. The code sequence i... | 05/14/1996 |
| 5511068 | Mobile communication system capable of transmitting and receiving a radio signal obtained by TDMA and CDMA without interference In a communication system from a mobile station to a base station, a transmitter of the mobile station subjects a sequence of transmission signals to both of time division multiple access (TDMA) and code division multiple access (CDMA) to produce a radio ... | 04/23/1996 |
| 5459473 | GPS receiver A GPS receiver for use with the NAVSTAR global, satellite based radio navigation and time transfer system wherein transmission from each of a plurality of satellites, includes C/A code signals comprising a code and data modulated carrier, said receiver co... | 10/17/1995 |
| 5432813 | Parallel processing based digital matched filter and error detector for a digital demodulator A high chipping rate digital demodulator circuit is coupled to the output of an analog front end communications receiver and comprises a low pass filter in each channel of the receiver. The filtered output is coupled to a plurality of parallel branches ea... | 07/11/1995 |
| 5426670 | Interference compensating circuit including a matched filter followed by a median filter A circuit arrangement is disclosed for reducing the adverse effects of interference in a signal of interest. The circuit arrangement includes a matched filter for receiving the signal of interest and a median filter coupled to the output of the matched fi... | 06/20/1995 |
| 5373531 | Signal acquisition and reception method for a global positioning system signal A signal acquisition method for a GPS receiver which eliminates the necessity of a clock circuit for keeping the current time and also a backup battery for memory is disclosed. According to the signal acquisition method, upon starting of acquisition of a ... | 12/13/1994 |
| 5353301 | Method and apparatus for combining multipath spread-spectrum signals A method and apparatus for combining multipath spread-spectrum signals are provided. The multipath combining is accomplished by detecting an envelope of an input differential phase shift keyed signal communicated over a communication channel. Subsequently... | 10/04/1994 |
| 5345472 | Method and apparatus for receiving and decoding communication signals in a CDMA receiver In an adaptive CDMA receiver (20), a DS-SS received signal and a reference signal are equalized by minimizing the error between them the received signal includes a desired DS-SS communication signal comprising binary bits coded with spreading chip sequenc... | 09/06/1994 |
| 5343496 | Interference suppression in CDMA systems Circuitry and concomitant methodology for demodulating Direct-Sequence, Spread-Spectrum Code-Division Multiple-Access (DS/SS CDMA) channel signal using multiple samples per transmitted symbol and a minimum mean squared error criterion to suppress interfer... | 08/30/1994 |
| 5335248 | Apparatus for correlating multi-frequency signals An apparatus and method of processing transmitted signals through the use of correlator means and RAM means thereby accomplishing synchronization and data interpretation. Specifically, a plurality of correlators are coupled to RAM means which cooperate to... | 08/02/1994 |
| 5311544 | Receiver of a direct sequence spread spectrum system A receiver of a direct sequence spread spectrum system includes a period counter for counting a period of a system clock, and outputting a data demodulation signal approximately every half-PN period, a peak detector for detecting a peak in the output from... | 05/10/1994 |
| 5305347 | Method of detecting the frequency deviation in digital communication transmissions The invention discloses a method of measuring the rough frequency deviation in digital communication transmissions with echo propagation, particularly in the short-wave domain. A repeatedly transmitted PN sequence serves as the preamble of a data block. T... | 04/19/1994 |
| 5297162 | System and method for bit timing synchronization in an adaptive direct sequence CDMA communication system In a CDMA communication system (100) capable of communicating between a receiver (20) and a transmitter (10) direct sequence spread spectrum communication signals (30), a system and method for synchronizing receiver bit timing and transmitter timing. Tran... | 03/22/1994 |
| 5293398 | Digital matched filter In a digital matched filter used as a correlator in a receiver in an SSC system, different bits of a received signal converted into a multi-bit signal are inputted into different correlators. After having weighted different correlation outputs, the differ... | 03/08/1994 |
| 5260967 | CDMA/TDMA spread-spectrum communications system and method A spread-spectrum transmitter and receiver using code division multiple access with time division multiple access technology for spread-spectrum communications. At a base station, a spread-spectrum transmitter includes a multiplexer for time multiplexing ... | 11/09/1993 |
| 5164959 | Digital equalization method and apparatus A digital equalizer and equalization method for a spread spectrum communication link that has a dispersive channel and other systems that process signals having a sufficient degree of redundancy in time and/or phase. No training signal is required, except... | 11/17/1992 |
| 5119104 | Location system adapted for use in multipath environments A radiolocation system for multipath environments, such as for tracking objects in a semiconductor fabrication facility (FIGS. 1a-1b), includes an array of receivers (20) distributed within the tracking area, coupled to a system processor (40) over a LAN.... | 06/02/1992 |
| 5105436 | Spread spectrum receiver A spread spectrum receiver using a correlator includes a pattern matching circuit for deciding presence or absence of a pulse output which is obtained upon coincidence between the pattern of a correlator output and a predetermined pattern, so as to switch... | 04/14/1992 |
| 5031173 | Decoder for added asynchronous bit sequences A composite signal is formed by simultaneously transmitting multiple asynchronous data bit sequences, that are coded with respective spreading codes, in a single channel; and a circuit is provided which decodes any bit b(x) in that composite signal. This ... | 07/09/1991 |
| 4914699 | High frequency anti-jam communication system terminal There is disclosed a high frequency communication system of the type employing a high frequency terminal which terminal can transmit a processed signal in a transmitting mode or process a received signal in a receiving mode which terminal includes a first... | 04/03/1990 |
| 4908836 | Method and apparatus for decoding multiple bit sequences that are transmitted simultaneously in a single channel Data bits are decoded from a composite signal that is formed by coding multiple bit sequences with respective spreading codes, and transmitting the coded bit sequences simultaneously and asynchronously over a single channel in which the bit sequences are ... | 03/13/1990 |
| 4755983 | Dedicated message matched filter In order to recover the original audio modulation samples when using a continuous code change, sampled data, spread spectrum waveform structure, a dedicated message matched filter is used to process data from multiple emitters within the same range interv... | 07/05/1988 |
| 4691326 | Spread-spectrum communication system A receiver in a spread-spectrum communication system is adapted to receive a signal which is modulated by a binary code modulated by a binary code or a data, and includes a matched filter which detects a correlation between the received signal and a refer... | 09/01/1987 |
| 4651327 | Decoder for spectrum diffusion signals A decoder for spectrum diffusion signals is capable of reproducing data from received a spectrum diffusion signal, such as satellite communication signals, without performing PN synchronization. The decoder comprises a correlation detector comprising a ma... | 03/17/1987 |
| 4647863 | Saw transition detector for PSK signals A phase transition detector for PSK signals which utilizes a dual channel SAW differential delay line to achieve a required delay. Each channel or path of the SAW device comprises an input and an output transducer. The two channels provide a predetermined... | 03/03/1987 |
| 4630283 | Fast acquisition burst mode spread spectrum communications system with pilot carrier A high frequency code division multiple access spread spectrum (CDMA SS) communications system includes multiple transmitters and their associated receivers, and a pilot carrier source. In order to reduce errors in the receiver IF frequency due to unavoid... | 12/16/1986 |
| 4481640 | Spread spectrum modem A MODEM for a high frequency radio data link which substantially enhances the recovery of data transmitted via the link in the face of multipath distortion and fading. A serial digital input signal for transmission is split into odd bit and even bit data ... | 11/06/1984 |
| 4470138 | Non-orthogonal mobile subscriber multiple access system An adaptive interference cancelling system for multibit spread spectrum noise codes wherein a plurality of users in a mobile subscriber access system each operates with a different noise code. Each user receives a composite signal which includes a desired... | 09/04/1984 |
