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5671218 Controlling power and access of wireless devices to base stations which use code division multiple access  
The invention relates to the use of CDMA techniques. Data signals to be transmitted from a plurality of wireless devices are spread across a common bandwidth. The data signals are received by a...
5668795 Modulation system for spread spectrum CDMA communiction  
The OCDMA waveform of the present invention uses bi-phase PN modulation (BPSK PN chip modulation) in conjunction with MPSK or MQASK data modulation (QPSK data modulation is one preferred...
5668803 Protocol for packet data communication system  
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer. Data packets are sent from the remote units by...
5661750 Direct sequence spread spectrum system  
A direct-sequence spread spectrum communication system using a high power transmitter and a short spreading sequence which still satisfies FCC Rule 15.247 regarding power density. In addition to...
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...
5612973 System employing dissipative pseudorandom dynamics for communications and measurement  
A communication and/or measurement system includes a transmitter that modulates a pseudo-random noise signal with a message signal to produce a wideband signal for transmission. A receiver, which...
5604732 Up-link access apparatus in direct sequence code division multiple access system  
Disclosed is a link access apparatus of a CDMA system using a DS/SS communication method, and more particularly an up-link access apparatus which overcomes a near/far problem occurring when mobile...
5602834 Linear coverage area antenna system for a CDMA communication system  
A linear coverage area antenna system for use within a CDMA communication system is described. In a preferred implementation, two linear coverage area antenna structures are positioned in parallel...
5583851 Mobile communication apparatus having multi-codes allocating function  
A mobile communication unit which can perform a high-bit rate information transmission by allocating a plurality of channel numbers to a user who carries out a high-bit rate communication. The...
5572514 Spread spectrum communication system capable of detecting occupying state of channel by off-communication terminal  
Assuming that 4-system communication with signals A, B, C and D is executed for each frame and one period consists of four frames for the signals A, B, C and D, and signals AS, BS, CS and DS,...
5559829 Method of constructing a spreading code associated with one user of a direct sequence code division multiple access digital transmission system and corresponding method of generating a table  
A method of constructing a spreading code associated with one user of a direct sequence code division multiple access digital transmission system includes at least one stage of concatenating a...
5546424 Spread spectrum communication system  
A spreading process is performed with a spreading code assigned to each user and a spreading code assigned according to an attribute, and the resultant signal is modulated on the transmitter side....
5546423 Spread spectrum digital transmission system using low-frequency pseudorandom encoding of the wanted information and spectrum spreading and compression method used in a system of this kind  
A spread spectrum digital transmission system using low-frequency pseudorandom encoding of desired information, and a spectrum spreading and compression method used in such a system. In a...
5539770 Spread spectrum modulating apparatus using either PSK or FSK primary modulation  
A spread spectrum modulating apparatus includes an oscillator outputting a carrier. A frequency multiplier multiplies a frequency of the carrier by a predetermined integer N1. A frequency divider...
5533045 Automatic vehicle identification system, interrogator and responder included in the same  
A mobile unit identifying system comprises: an interrogator having: a spread spectrum signal generation circuit for generating a spread spectrum coding signal using a predetermined pseudo noise...
5532695 Power of two length pseudorandom noise sequence generator  
A mobile communication method is disclosed, and particularly a power of two length pseudorandom noise sequence generator is disclosed, in which a pseudorandom noise code sequence is generated to...
5517198 Ultra-wideband directional sampler  
The Ultra-Wideband (UWB) Directional Sampler is a four port device that combines the function of a directional coupler with a high speed sampler. Two of the four ports operate at a high...
5504776 Spread spectrum communication system and transmitter-receiver  
A spread spectrum communication system for performing spread spectrum communication by superimposing a pseudo noise signal on a transmitted signal. The system comprises traffic detecting means for...
5499267 Spread spectrum communication system  
A spread spectrum communication system includes a receiving section which receives a signal produced by modulating a carrier of a predetermined frequency with a spread spectrum signal which has...
5481533 Hybrid intra-cell TDMA/inter-cell CDMA for wireless networks  
In a cellular network, a multiple-access methodology and concomitant circuitry in which TDMA is used inside each cell and CDMA signals, having pulse shapes with low cross-correlations, are...
5475707 Broadband communications system  
A signal of bandwidth Fmax is unambiguously transmitted over a datalink having a bandwidth less than Fmax by subdividing the signal into a plurality of subspectrums and bandshifting the...
5438589 Spread spectrum communication system  
A spread spectrum communication system includes a transmitter and a receiver responsive to a signal transmitted by the transmitter, the transmitter including: a pseudonoise signal generator for...
5432815 Data modulator-demodulator apparatus of a spread spectrum communication system  
In performing data communication between a subscriber terminal and a scanner of a remote information processing system, there is provided a data modulator-demodulator apparatus of a pseudo noise...
5430760 Random access in mobile radio telephone systems  
The present invention includes a system and method for minimizing interference between two radio stations, e.g., a mobile radio telephone and a fixed base station, at the initiation of a radio...
5425050 Television transmission system using spread spectrum and orthogonal frequency-division multiplex  
An apparatus for encoding a television production signal for transmission, the television production signal including a first input signal carrying a first class of data and a second input signal...
5381444 Radio environment measuring system  
A radio environment measuring system for measuring a propagation state of radio waves includes: a fixed radio apparatus provided in a base station; a mobile radio apparatus operatively connected...
5377226 Fractionally-spaced equalizer for a DS-CDMA system  
An adaptively-tuned filter (80) for use within the receiver (14) of a multiple-access code division (CDMA) communication system permits spectrally-inefficient transmissions to be made from each...
5365551 Data communication transceiver using identification protocol  
One or more interrogating commander stations and an unknown plurality of responding responder stations coordinate use of a common communication medium. Each commander station and each responder...
5359624 System and method for chip timing synchronization in an adaptive direct sequence CDMA communication system  
In a CDMA communication system (100) capable of communicating between a receiver (10) and a transmitter (20)direct sequence spread spectrum communication signals (30), a system and method for...
5357541 Transceiver providing selectable frequencies and spreading sequences  
A transceiver for transmitting and receiving digital data is disclosed. The transceiver employs direct sequence spread spectrum communications techniques for reducing interference among multiple...
5345469 Communication device with code sequence selection system  
A code division multiple access (CDMA) communication system (10) having a plurality of spreading codes including a control code includes a first communication device (100) and a second...
5341396 Multi-rate spread system  
Apparatus and a method for transmitting a direct sequence, spread spectrum communication system signal. A transmitter (10) that receives a variable data rate information bearing input signal from...
5329547 Method and apparatus for coherent communication in a spread-spectrum communication system  
A method and apparatus is provided for encoding and decoding to facilitate coherent communication. In encoding, reference symbols are inserted into a stream of input data symbols to form a...
5317593 Communication device with code sequence and frequency selection system  
A code division multiple access (CDMA) communication system (10) for reuse of available spreading codes includes a first communication device (100) and a second communication device (106). The...
5311543 Television transmission system using two stages of spead-spectrum processing  
A 2-stage SS (spread-spectrum) system for transmitting a coded TV signal, said coded signal consisting of first components requiring near-perfect transmission and second components for which...
5305348 Spread-spectrum communication apparatus  
A spread-spectrum communication apparatus has code generators for generating spread-spectrum and reverse spread-spectrum codes. Rather than using a code generator which differs for every...
5303260 Method and circuit for compensating for oscillator drift in a spread-spectrum communication system  
The present invention applies in a communication system where - a) two vehicles VA and VB transmit data to each other intermittently, b) data transmitted from VA to VB is modulated in VA by a PN...
5301206 Spread spectrum communication system  
A spread spectrum communication system comprising a transmitter including an angle modulator, a frequency divider, a spread code generator, and a spread spectrum modulator, and a receiver...
5235616 Bidirectional data transmission system  
A bidirectional data transmission system using the technique known as spectrum spreading by direct sequence comprises a first transmitter-receiver assembly consisting of a first transmitter...
5208829 Communication satellite system having an increased power output density per unit of bandwidth  
A satellite communication system for providing maximum power output in a spread spectrum signal transmission is disclosed. Spectral shaping is provided at a satellite transmitter to shape a spread...
5204874 Method and apparatus for using orthogonal coding in a communication system  
A method and apparatus is provided for encoding and decoding. In encoding, bits (202) are encoded (204) into symbols (206) such that maximum likelihood decoding is facilitated. Groups of symbols...
5177766 Digital clock timing generation in a spread-spectrum digital communication system  
A unique method and system is disclosed for generating digital clock timing in a receiver for use in direct-sequence spread-spectrum digital communication systems wherein spread data is delivered...
5170410 Direct sequence spread spectrum digital communication system employing sequence changing during transmission and transmitter and receiver implementing same  
A digital signal receiver comprises receiver and demodulator means producing from the received signal a succession of complex elements. It produces sequences of successive complex elements...
5136614 Spread spectrum communication system  
A spread spectrum communictdion system includes a transmitter and a receiver, and an on-off keying signal is inputted to the transmitter. A carrier signal is modulated by the on-off keying signal,...
5103461 Signal quality measure in packet data communication  
A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central compuer which maintains a database management system. Data...
5101406 Wireless communications system  
A wireless packet communication system is operable in a frequency band occupied by other transmission sources. The system includes a base station and several remote stations. Each remote station...
5077753 Radio communication system using spread spectrum techniques  
A spread spectrum radio communication system includes a generator for generating a pseudo-random chipping sequence, a frequency spreader for combining digital data with the pseudo-random chipping...
5077754 Tau-dither circuit  
A tau-dither circuit in a spread spectrum communications system wherein a first PN code with a large phase change and a second PN code without a phase change are generated in the tau-dither...
5036523 Automatic frequency control of satellite transmitted spread spectrum signals  
Automatic frequency control is provided in a satellite-based spread spectrum radio communication system by employing a pilot signal as a frequency reference. A transmitter inserts the pilot signal...
5001723 Sinusoidal M-ary orthogonal keyed decoding  
A spread spectrum communications system is described for recovering data from a signal having a first carrier frequency modulated by one of at least four phase modulations, each phase modulation...