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6862313 Direct conversion spread spectrum time division duplex radio  
A wireless transceiver comprises a digital to analog converter having an input for receiving a digital representation of a direct sequence spread spectrum signal and having an analog output. A...
6859487 Radio communication system and base station and mobile terminal to be employed therein  
A radio communication system is capable of realizing a space diversity with single channel of an antenna and a receiver in a mobile communication equipment or by assigning one spread code. The...
6859463 Methods and apparatus for organizing selection of operational parameters in a communication system  
Operational parameters for transmitting a signal over a communication channel of a network are selected by first determining RF conditions on the communication channel from a received signal...
6850555 Signalling system  
A signalling system is provided which can be used to update the prices of goods which are electronically displayed on supermarket shelves (1). The signalling system comprises a first signalling...
6836504 Method and apparatus for spreading symbols in a communication system  
A spreader (216) comprises a code generator (301) and exclusive OR circuitry (303). In the preferred embodiment of the present invention the code generator (301) generates a code having a length...
6834078 Test facility for transceiver station  
Test circuitry for a transceiver is described which allows tests to be conducted on a transmission loop without requiring decoding by rake fingers. According to one embodiment, a receiver for...
6831941 CDMA system which uses pre-rotation before transmission  
A digital spread spectrum communication system calculates phase and frequency error on a received signal from a communicating entity during a wireless communication and pre-corrects a signal for...
6827483 Spectrum spreading communication system using single spreading code  
A spectrum spreading communication system including a radio base station includes a receiving section, a correlation detecting section, a rake synthesizing section and a control section. The...
6829289 Application of a pseudo-randomly shuffled hadamard function in a wireless CDMA system  
A method of improving bandwidth of wireless CDMA systems by shuffling the rows of a Hadamard function in a pseudo-random manner. A Hadamard function is used to provide orthogonality between users....
6810073 Method and system for interference cancellation using multiple filter sets and normalized filter adaptation  
A method and system for canceling interference in a code division multiple access (CDMA) network. A transmitted signal is spread using a specific spreading sequence. The signal includes a...
RE38603 Data transmitter and receiver of a spread spectrum communication system using a pilot channel  
An improved spread spectrum communication system includes a transmitter and a receiver utilizing a pilot channel for the transmission of pure rather than modulated PN codes for code acquisition or...
6798823 Parallel distributed sample acquisition system and signal acquisition method using the same  
A parallel distributed sample acquisition system is disclosed. It is capable of carrying out parallel distributed sample acquisition employing M-ary signaling for fast synchronization of a...
6798826 Method and apparatus for performing reverse rate matching in a CDMA system  
Techniques for processing symbols received for a (transport) channel in a (W-CDMA) communication system. According to the W-CDMA standard, the coded bits of a transport channel are first...
6778586 Radio communication equipment and communication method  
The radio communication apparatus (10) comprises a buffer (14) which temporarily stores data to be sent, a transmission/receiving circuit (12) having a data transmission circuit (30) and a data...
6768441 Methods of receiving communications signals including a plurality of digital filters having different bandwidths and related receivers  
Methods of receiving communications signals can include generating a received analog signal including energy corresponding to communications transmitted from a remote transmitter, and performing...
6763058 Low signal to noise ratio acquisition and link characterization techniques for VSAT spread spectrum modems  
A direct sequence spread spectrum (DS-SS) communications modem for low signal to noise ratio applications and secure communications systems (10). The modulator (22) implements a quadrature-phase...
6763057 Vector modulation system and method for wideband impulse radio communications  
An apparatus and method for communicating information using an ultra wideband impulse radio transmitter and receiver is disclosed. The method includes the steps of generating and transmitting a...
6757319 Closed loop power control for common downlink transport channels  
To increase capacity in a spread spectrum packet communication system, a closed loop power control (CLPC) is provided for a common/shared downlink transport channel, such as a Forward Access...
6757322 Space diversity and coding, spread-spectrum antenna 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...
6738414 Radio and communication method using a transmitted intermediate frequency  
The present invention provides a system and method for radio communications wherein the transmitted signals include an intermediate frequency in addition to a carrier frequency to aid in...
6735247 Method and apparatus in a communication system  
In a communication system, a method and an accompanying apparatus provide for efficient modulation and demodulation processes. In a transmitter (100), a ratio of power level of a communication...
6735239 Sequence generator  
A sequence generator for generating sequences of binary or discrete values may be flexibly adjusted to requirements. Shift register memory locations may be selected as feed-back locations for...
6731674 Device and method for generating quasi-orthogonal code and spreading channel signals in mobile communication system  
A device and method for generating a binary quasi-orthogonal code in a CDMA communication system. The method comprises generating an m-sequence, and specific left and right sequences having a good...
6728296 Direct sequence spread spectrum system with enhanced forward error correction code feature  
A direct sequence spread spectrum system in which a plurality of substantially redundant second blocks are derived from a first block of data. Each of the second blocks is spread using a distinct...
6724805 Nonlinear dynamic system for spread spectrum code generation and acquisition  
Nonlinear dynamic systems for generating and acquiring a spread spectrum signal pseudo-random noise (PN) signal are disclosed. An actuating signal is delayed by a first and second period to...
6717983 Ultrasonic coding modem for digital network communication  
An ultrasonic coding modem for digital network communication comprises a transmitting device having a first piezoelectric substrate, and a receiving device having a second piezoelectric substrate....
6714582 Code division multiple access communication system and code division multiple access transmitting apparatus  
In a CDMA transmitting apparatus, a cross-correlation value between different spreading-code sequences used to spread respective ones of a plurality of transmit signals is calculated, an...
6700921 Spread-spectrum communication apparatus  
A spread-spectrum communication apparatus includes an analog modulator and demodulator for modulating and demodulating information in its transmitter and receiver respectively. The apparatus also...
6693953 Adaptive wireless communication receiver  
The present invention provides methods and apparatus for controlling power utilization in a wireless communication receiver. A representative system comprises a signal properties evaluation...
6690711 User equipment which uses pre-rotation before transmission  
The present invention is an apparatus for reducing transmission errors by a user equipment (UE) when transmitting a communication signal. An RF communication signal is received at the UE and...
6687319 Spread spectrum clocking of digital signals  
A clock signal desired to be transmitted to various components of the electronic system is combined with a noise signal to generate a spread spectrum clock signal which, in turn, is distributed...
6683905 Dual-mode receiver  
A common dual-mode physical layer architecture for a communications receiver is capable of receiving either frequency hopping spread spectrum signals or direct sequence spread spectrum signals. A...
6680966 Spread-spectrum transmission system with filtered multi-carrier modulation  
The invention provides a spread-spectrum transmission system with multiple carrier modulation in which the signals for transmission over each of the subcarriers are filtered prior to being...
6675347 Method and apparatus for combined puncturing and repeating of code symbols in a communications system  
Techniques for puncturing symbols in a communications system are disclosed. S symbols are received for a frame having a capacity of N symbols, with S being greater than N. P symbols need to be...
6665333 Methods and apparatus for determining the time of arrival of a signal  
A spread spectrum position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging messages...
6658269 Wireless communications system  
The present invention relates to a transmit diversity antenna system employing active antenna electronics (with both receive and transmit amplifiers distributed among the elements of the antenna),...
6658045 CDMA communications system adaptive to mobile unit speed  
The invention is a CDMA system which achieves improved performance by virtue of being adaptive to the speed of each mobile unit in the system. A speed estimator for each mobile unit can be located...
6650688 Chip rate selectable square root raised cosine filter for mobile telecommunications  
A square root raised cosine filter for a mobile transceiver may be adapted to operate with a variety of potential chip rates such as the four chip rates associated with IMT-2000 standard. The...
6636553 Pseudorandom noise generator for WCDMA  
A circuit is designed with a plurality of logic circuits (370-374) for producing an offset state matrix. The circuit includes a first logic circuit (380-383) coupled to receive N elements of a...
6633600 Traffic lights in a code division multiple access (CDMA) modem  
A spread spectrum code division multiple access communication system has a plurality of traffic channels. A plurality of traffic lights have a red state and a green state. Each traffic light is...
6622023 Method and apparatus for improved fast forward power control in a CDMA network  
A method and network element for fast forward power control in a CDMA network includes establishing an artificial FPC_SUBCHAN_GAIN parameter having a value different from an actual...
6606345 Base station which uses pre-rotation before transmission  
The present invention is a method and apparatus for reducing transmission errors by a base station when transmitting a communication signal. An RF communication signal is received at the base...
6603796 Radio communication system and transmission and/or reception apparatus for use in the system  
A radio communication system includes a transmission apparatus and a reception apparatus, enabling to retransmit a frame which has caused a code error in the CDMA method, without lowering the...
6603980 Transmitter-receiver, and method for controlling transmission power of the same  
Received quality detecting section 108 detects a received quality, bit determining section 111 determines whether a TPC bit is 0 or 1, amplitude reading section 112 reads a ratio of an amplitude...
6600771 Spread spectrum phase modulation for suppression of electromagnetic interference in parallel data channels  
A new spread spectrum phase modulation (SSPM) technique is applicable to both data and clock signals. The SSPM technique is more suitable to board level designs than the direct-sequence spread...
6597730 Satellite communication array transceiver  
A satellite communications system (10) that employs an array of separate and easily deployable antennas (12) for transmission and reception purposes to accommodate high data rate transmissions....
6580748 Spread spectrum communication method and spread spectrum communication apparatus  
A UW multiplexing circuit multiplexes a fixed pattern over the leading edge of each frame of transmit data. A spreading code generating circuit generates spreading codes TP1 at a timing...
6574205 CDMA cellular system and method of detecting spreading code in CDMA cellular system  
A CDMA cellular system does not require accurate synchronization between all base stations and is capable of distinguishing the base stations from each other without the need for a complex...
6556617 Spread spectrum diversity transmitter/receiver  
A spread spectrum diversity transmitter/receiver, in which a bit error rate is improved even at a severe multi path fading channel, is provided. At a transmitting section, a multi dimensional...
6553056 CDMA receiver with a reduced number of required high speed adders  
A CDMA receiver with a reduced number of high speed adders is provided, wherein integration for one symbol period is performed for each value of spreading code corresponding to a particular user...