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6542718 Method and apparatus for terminating a burst transmission in a wireless system  
In order to effectively terminate a burst transmission in a wireless system, a method and apparatus determines whether or not a burst transmission from a wireless unit to a base station should be...
6532250 Methods and apparatus for spreading and despreading information signals in code division multiple access communications systems  
Code Division Multiple Access (CDMA) spreading and despreading techniques eliminate the need for frame-length chip buffers within despreading and demodulation processors in CDMA receivers....
6522684 Delay lock loop, receiver, and spectrum spreading communication system  
In a DLL, in-phase correlation signal and orthogonal correlation signal are squared and adder to generate correlation power. Delays are provided so that the peaks of N number of divided...
6522685 Information signal processing unit  
A new additional information generating section generates new additional information FS1 based upon information from an additional information reading section. The spectrum of the new additional...
6512784 Efficient sharing of capacity by remote stations using circuit switching and packet switching  
An improvement to a spread-spectrum, code-division-multiple-access (CDMA) cellular system having multiple circuit-switched (CS) remote stations, multiple packet-switched (PS) remote stations and a...
6510173 Method for the orthogonal and offset transmission-reception of a signal and device for realizing the same  
An information stream of binary symbols is divided into serial packets of N binary symbols. The method further includes serial-parallel conversion of binary symbols in each serial packet and...
6507601 Collision avoidance  
A code-division-multiple-access (CDMA) system provides a collision avoidance mechanism for packet communications. When mobile stations attempt to establish links with a base station, the base...
6501786 Direct spread spectrum communication system corresponding to delayed multiplex mode, and method of communication using the system  
A direct spread spectrum communication system in accordance with a delayed multiplex mode in which improvement in correlation and improvement in error rate can be perfectly realized in any data...
6490313 System and method for PN offset index planning in a digital CDMA cellular network  
A system optimally assigns pseudo-noise (PN) offsets in a cellular network that includes several sectors. The system sets parameters for the cellular network, determines potential interference...
6480525 Second level collision resolution for packet data communications  
In a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, mobile stations initially seek access to a selected one of two or more groups of common packet channels...
6473453 High data rate multiplexed multichannel high frequency broadcast system  
A high frequency communications system comprises eight multiplexed (112) spread spectrum channels with data in each channel transmitted using, for example, 32 semi-orthogonal codes to enable 5...
6473449 High-data-rate wireless local-area network  
An apparatus and method for communicating data between at least two data devices, suitable for use as a wireless local-area network, that provides robust data communication via a radio...
6469620 Method and apparatus for protecting a transmission path between a base unit and a mobile key unit  
The invention relates to a method and apparatus for protecting a transmission path between a base unit and a mobile key unit in an access control system, in particular for motor vehicles. A...
6466610 Spread-spectrum, space diversity and coding antenna system and method  
A system and method for transmitting a plurality of spread-spectrum signals over a communications channel having fading. The plurality of spread-spectrum signals are radiated by a plurality of...
6452960 Audio data transmission apparatus and method, audio data recording apparatus, and audio data recording medium  
An audio data transmission and recording system and a recording medium according to the system. Gaps in the audio data are used to control the addition of spectrum-diffused data to the audio data....
6452916 Space-time spreading method of CDMA wireless communication  
We describe a method for CDMA transmission of sets of data symbols to users that are organized into one or more user groups. Each user group is paired with a group of spreading codes, referred to...
6449305 Method and apparatus for performing handoff in a spread-spectrum communication system  
Handoff from a Code-Division, Multiple Access (CDMA) protocol to an Advanced Mobile Phone Service (AMPS) protocol occurs by comparing a remote unit's (405) phase shift measurement to a threshold...
6445714 Code generator for multiple correlators  
A code generation apparatus that is connected to a plurality of correlation devices connected in parallel includes an initial long code (LC) state mask, initial state registers, a state buffer,...
6441764 Hybrid analog/digital signal coding  
An apparatus and method for subband signal coding, using algorithms of comparable complexity to conventional coders, that exploits a noisy analog signal at the decoder. It is assumed that the...
6442191 Technique to extend the jamming margin of a DSSS communication system  
A device to extend the jamming margin of a low data rate DSSS communication system uses a transmitter which has two spreading sequences, a primary and a secondary sequence. The receiver uses a...
6442190 Method and system for self-encoding a sequential string of data symbols for transmission via communication systems  
Disclosed is a method of “self-encoding” data symbols for transmission over spread-spectrum, (eg. (CDMA), (FDMA)), communication systems which utilizes encountered data symbols, in a sequence of...
RE37802 Multicode direct sequence spread spectrum  
In this patent, we present MultiCode Direct Sequence Spread Spectrum (MC-DSSS) which is a modulation scheme that assigns up to N DSSS codes to an individual user where N is the number of chips per...
6421370 Spectrum spreading system  
A spread spectrum communication system includes a plurality of mobile stations and a plurality of base stations that share the same frequency and operate independently. Each of the base stations...
6411645 Modulation apparatus of multicarrier direct sequence spread spectrum communication system  
The present invention relates to a signal modulation apparatus of multicarrier direct sequence spread spectrum communication system. There was a problem that since multiple carrier having...
6393048 Method for the transferring a digital data signal using spread spectrum  
In the method for the transfer of a digital data signal with predetermined band width from a transmitter to a receiver, the spread spectrum technique is used. In the method, the data signal is...
6389059 Multi-band, multi-mode spread-spectrum communication system  
A technique for spread-spectrum communication which uses more than one mode and more than one frequency band. Selectable modes include narrowband mode and spread-spectrum mode, or cellular mode...
6377609 Spread spectrum frequency hopping system and method  
A frequency hopping spread spectrum wireless transmission system includes a transmitter and a receiver system. The transmitter is configured to transmit radio frequency data signals in sequential...
6377612 Wireless repeater using polarization diversity in a wireless communications system  
The invention includes methods and systems to improve the signal diversity between a repeater and a base station in a wireless communication system. A communications device transmits a wireless...
6373880 Frequency modulation circuit  
In scramble calculation by a complex multiplier used for a frequency spread modulation circuit of this invention, the scramble circuit can be simplified because input signals are processed as...
6366568 Transfer station for wireless telephone distribution system with time and space diversity transmission  
A wireless communication system combines time and space diversity to reduce fading and simplify receiver design. In particular, a data packet which carries digital telephone traffic, is...
6363100 Radio data communication system using spread spectrum scheme  
In a transmission side, a k-bit parallel signal is divided into n signals, which are respectively encoded and then phase-shifted so as to causing a mutual phase difference of π/2n. Spectrum...
6356579 Radio paging system  
A paging system including one or more pagers having a transmitting function. The pagers can transmit to a base station a response upward signal acknowledging reception of a paging signal, and a...
6356580 Direct sequence spread spectrum using non-antipodal phase shift keying  
A reception simplified, reduced cost spread spectrum transceiver device and method. The transmitting portion of the transceiver antipodally modulates a pseudorandom code and non-antipodally...
6324207 Handoff with closed-loop power control  
In a cellular spread-spectrum communications network, a system and method for handing off a remote station from a source-base station to a target-base station without loss of data. The remote...
6317452 Method and apparatus for wireless spread spectrum communication with preamble sounding gap  
A wireless spread spectrum communication system comprises a spread spectrum transmitter and spread spectrum receiver which communicate according to an over-the-air protocol. The spread spectrum...
6314126 Spread-spectrum handoff and source congestion avoidance system and method  
A spread-spectrum, code-division-multiple-access (CDMA), system with a remote station (RS) communicating with a first base station (BS). The remote station receives the first BS-packet signal, and...
6310907 Spread spectrum diversity transceiver  
A spread-spectrum transceiver using a combination of time diversity and error-correction is disclosed. An error-correcting encoder encodes N-branch time-diversity signals to produce M-branch...
6282228 Spread spectrum codes for use in communication  
A technique for modulating and demodulating CPM spread spectrum signals and variations of CPM spread spectrum signals uses a set of codes or multiple sets of codes that reduce cross-correlation...
6266362 Modulated spread spectrum in RF identification systems method  
A method for RF communication between transceivers in a radio frequency identification system that improves range, decreases multipath errors and reduces the effect of outside RF source...
6259723 Data communication system  
A data communication system for executing data transmission and reception by modulating data using a code according to a CDMA system, in the field of optical communication, includes a code...
6252898 Spread spectrum communication method and system wherein data rate of data to be transmitted is changed in accordance with transmission quality  
A spread spectrum communication method includes the steps of measuring a parameter indicative of a C/N value of a received signal at one station during a communication between stations remote from...
6218931 Home-appliance network with nodes identified by direct-sequence spreading codes  
Described herein is a network interface for coupling residential appliances into a code-division multiple access (CDMA) network. The network is used to convey appliance control signals and...
6215813 Method and apparatus for encoding trellis coded direct sequence spread spectrum communication signals  
A method and an apparatus for encoding of trellis coded direct sequence spread spectrum communication signals are provided. An input data bit sequence is received into a transmitter where it is...
6194996 Information transfer via power line carrier  
A signal superposing apparatus designed, in accordance with a basic power line model taking account of the term of the mutual inductance and that of a self inductance of a transformer connected to...
6175555 Transmit/receive compensation  
In a time division duplex (TDD) system, compensation measurements are made for the transmission circuitry during the receive portion of the TDD cycle and compensation measurements are made for the...
6173005 Apparatus and method for transmitting signals in a communication system  
Orthogonal transmit diversity is implemented by employing a data splitter (803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits...
6167038 Data transmission method, and a cellular radio system  
a data transmission method in a cellular radio system is provided. Each cell in a cellular radio system includes at least one base station and a number of subscriber terminal equipment connected...
6160840 Apparatus and methods for puncturing and recovering code in spread spectrum communication system  
Apparatus and methods for puncturing and recovering a code in a spread spectrum communication system are provided. Repeated symbols are punctured in predetermined locations and different data is...
6134261 FDD forward link beamforming method for a FDD communications system  
A highly bandwidth-efficient communications method is disclosed, to maximize the signal-to-interference-noise ratio (SINR) of transmissions from a base station to a remote station in a wireless...
6128330 Efficient shadow reduction antenna system for spread spectrum  
A system and method for transmitting a plurality of spread-spectrum signals over a communications channel having fading. The plurality of spread-spectrum signals are radiated by a plurality of...