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6539050 Method for transmitting wideband signals via a communication system adapted for narrow-band signal transmission  
A communication system is used to transmit and receive a plurality of relatively narrow-band signals and wideband signals. The two signal types share a common electromagnetic spectrum by employing...
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....
6522685 Information signal processing unit  
A new additional information generating section generates new additional information FS 1 based upon information from an additional information reading section. The spectrum of the new additional...
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 correlation...
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 carrier...
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...
6449306 Orthogonal complex spreading method for multichannel and apparatus thereof  
An orthogonal complex spreading method for a multichannel and an apparatus thereof are disclosed. The method includes the steps of complex-summing α n1 W M,n1 X n1 which is obtained by...
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,...
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...
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...
6430212 Spread-spectrum GMSK/M-ary radio  
A communication device includes a transmitter and receiver. The transmitter includes an M-ary encoder configured to generate an M−1 number of distinctive symbols each comprising k bits. M is...
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 different...
6396867 Method and apparatus for forward link power control  
A forward link power control mechanism measures the reverse link power control bits which are transmitted on the forward traffic channel. At the remote station, the reverse link power control bits...
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 and...
6389058 Apparatus and method for performing fast acquisition of PN sequences by transferring distributed samples  
This invention is to provide an apparatus and method for performing fast distributed sample acquisition (DSA) which is applicable to DS/CDMA system with a long-period PN sequence. The apparatus...
6389056 Pre-data power control common packet channel  
An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base...
6381262 Information signal processing unit  
A new additional information generating section generates new additional information FS 1 based upon information from an additional information reading section. The spectrum of the new additional...
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...
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...
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 transmitted...
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/2 n . Spectrum...
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...
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...
6356528 Interleaver and deinterleaver for use in a diversity transmission communication system  
Apparatuses for a transmitter and a receiver which enhance the performance of a system utilizing interleaving and transmit diversity by reordering the sequence of symbols transmitted along the...
6347111 Noise shaping technique for spread spectrum communications  
A spread spectrum noise shaper uses a modulation technique to achieve a greater signal-to-noise or signal-to-interference ratio (SNR or SIR). The technique doubles the system SIR, in principle....
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...
RE37420 Automobile on-board and/or portable telephone system  
In an automobile on-board and/or portable telephone system capable of increasing the capacity of subscribers easily on the basis of changing of the information transmission bit rate, spread codes...
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...
6266363 Transmitting/receiving apparatus using a plurality of spreading codes  
Transmitting/receiving apparatuses are installed in a base station and a mobile station, respectively, to perform mutual transmission and reception by using a plurality of spreading codes. The...
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...
6266360 Direct-spread-spectrum communication system  
To improve the throughput of a direct spread-spectrum communication system transmitting and receiving signals multiplexed according to a data format having a simplex portion and a multiplexed...
Matches 201 - 250 out of 434 < 1 2 3 4 5 6 7 8 9 >