Linex Technologies, Inc.

Golden Bridge Technology, Inc.

Other

Interdigital Technology Corporation

Linez Linex Technologies, Inc.

Joseph Garodnick

Donald L Schilling

Joseph L Stern

Gary R Lomp

Timothy F Moore, Iii

Elmer Yuen

A communications system and method having a transmitted data rate determined by an error rate syndrome at a receiver. Data are demultiplexed into a plurality of data channels, and processed as a plurality of channels. A combiner combines the plurality of channels as a multiplexed signal. At a receiver, the multiplexed signal is despread into a plurality of despread channels. A syndrome signal is generated from an error rate of the channels. From the syndrome signal, a desired-data rate is determined for the transmitter.

Variable throughput reduction communications system and method

An improvement to multi-carrier communication, such as an OFDM and MC-CDMA system, where in a multipath or phase distorted channel, the received signal is flat with respect to frequency and linear with respect to phase. A first unit transmits a plurality of multi-carrier signals, which include unmodulated carrier signals. A second unit receives the plurality of multi-carrier signals, and determines the in-phase and quadrature amplitudes or powers of the unmodulated carrier signals of the received multi-carrier signal. The second unit compares the measured in-phase and quadrature amplitudes or powers of the unmodulated carrier signals to predetermined criteria, and generates adjusting data from the compared in-phase and quadrature amplitudes or powers. The first unit uses the adjusting data to pre-distort the next plurality of multi-carrier signals to be transmitted, the in-phase and quadrature amplitudes or powers of the plurality of multi-carrier signals. The first unit transmits, with the in-phase and quadrature phase adjusted per the adjusting data, the next plurality of multi-carrier signals, through the communications channel.

Power control in a multicarrier communications system

System and method for reducing acquisition time of packets in a FDD system, such as a spread-spectrum or OFDM system. A remote unit transmits a multi-tone packet. The multi-tone packet has a plurality of tones with each tone having a different power level, and at a different frequency, from other tones in the plurality of tones. The base station receives the multi-tone packet. The base station compares the plurality of tones from the received multi-tone packet to a threshold or other selection criteria. A tone is selected from the plurality of tones meeting desired selection criteria. Based on the selected tone, the base station transmits a BS packet with the BS packet having power information from the power level of the selected tone.

Reduced time packet transmission in a wireless communications system

A mesh network communication system including one or more mesh networks and a plurality of remote subscriber users employing wireless, spread spectrum type communications for communicating with an access node in one of the mesh networks. The remote subscriber units can be mobile and can use handover to change nodes within a mesh network without a disruption of communication. The system and methods determine the location of a remote subscriber unit in a mesh network by the remote subscriber unit providing the access node with its home address and ID such that if the access node is not the home node, the home node is notified of the visiting node address such that the home node always knows the location of any remote subscriber unit based at the home node. Accordingly, communication between remote subscriber units where one of the remote subscriber units is not currently located at its home node can be accomplished without using the home node.

Mesh network communication systems and methods

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 transmits a first RS-packet signal to the first base station. The first RS-packet signal is spread by a first RS-chip-sequence signal at a second frequency. The first base station receives the first RS-packet signal. The first base station stores and forwards the despread first RS-packet signal to a central office (CO). The remote station monitors control and packet transmission channels of other base stations in geographic proximity to the remote station. Each of the base stations transmit BS-packet signals. The remote station determines, based on signal metrics and available capacity, when to change from the first base station to the second base station. The second base station stores and then forwards the despread second RS-packet signal to the central office. The despread second RS-packet signal includes a source address from the second base station and the source address from the remote station. For return communications from the central office, the central office reads the source address from the second base station, and routes return packet signals, denoted herein as CO-packet through the second base station to the remote station.

Handoff and source congestion avoidance spread-spectrum system and method

A distributed spread-spectrum network, comprising remote stations and nodes. One or more hub node(s) connect(s) to a central telephone office. A node's spread-spectrum transceiver communicates, using packets having spread-spectrum modulation, over radio waves, with the remote stations. Each packet has a source address and a destination address, and may have other information such as a header, start of message, end of message, flow-control information, forward error correction, and message data. A store-and-forward subsystem stores and forwards one or more packets to and from the remote station. The store-and-forward subsystem stores and forwards the one or more packets to and from another node. A flow-control subsystem controls the store-and-forward subsystem, to store each packet arriving at the spread-spectrum transceiver. The flow-control subsystem communicates traffic information between each of the nodes. The flow-control subsystem routes the packet through appropriate nodes to the hub node from a remote station. Based on the traffic at each node, the flow-control subsystem transmits the packet from the hub node to an appropriate node, and routes the packet to a recipient remote station. The flow-control subsystem routes the plurality of packets through a path in the plurality of nodes to ensure that the plurality of packets arrive sequentially for voice or video packets.

Distributed spread-spectrum network

A spread-spectrum system having a transmitted data rate determined by an error rate syndrome at a spread-spectrum receiver. Data are demultiplexed into a plurality of data channels, and spread-spectrum processed as a plurality of spread-spectrum channels. A combiner combines the plurality of spread-spectrum channels as a code-division-multiplexed signal. At a receiver, the code-division-multiplexed signal is despread into a plurality of despread channels. A multiplicity of adders, which is electronically controlled by an adder-control signal, adds several of the despread channels to generate a multiplicity of added channels. A syndrome signal is generated from an error rate of the multiplicity of added channels. From the syndrome signal, a desired-data rate is determined for the spread-spectrum transmitter.

Variable throughput reduction spread-spectrum communications

A distributed network, spread-spectrum system comprising a plurality of remote stations and a plurality of nodes. One or more hub node(s) connect(s) to a central telephone office. A node's spread-spectrum transceiver communicates, using packets having spread-spectrum modulation, over radio waves, with the plurality of remote stations. Each packet has a source address and a destination address, and may have other information such as a header, start of message, end of message, flow-control information, forward error correction, and message data. A store-and-forward subsystem stores and forwards one or more packets to and from the remote station. The store-and-forward subsystem stores and forwards the one or more packets to and from another node in the plurality of nodes. A flow-control subsystem controls the store-and-forward subsystem, to store each packet arriving at the spread-spectrum transceiver. The flow-control subsystem communicates traffic information between each of the nodes in the plurality of nodes. The flow-control subsystem routes the packet through appropriate nodes to the hub node from a remote station. Based on the traffic at each node, the flow-control subsystem transmits the packet from the hub node to an appropriate node, and routes the packet to a recipient remote station. The flow-control subsystem routes the plurality of packets through a path in the plurality of nodes to ensure that the plurality of packets arrive sequentially for voice or video packets.

Distributed network, spread-spectrum system

Spread-spectrum handoff and source congestion avoidance system and method

A spread-spectrum system having a transmitted data rate determined by an error rate syndrome at a spread-spectrum receiver. A demultiplexer demultiplexes input data into a plurality of data channels. A plurality of FEC encoders FEC encodes the plurality of data channels, as a plurality of FEC encoded channels. A plurality of spread-spectrum processors spread-spectrum processes the plurality of FEC encoded channels as a plurality of spread-spectrum channels. The plurality of spread-spectrum channels preferably uses a plurality of orthogonal or quasi-orthogonal chip-sequence signals to define a particular spread-spectrum channel. A combiner combines the plurality of spread-spectrum channels as a code-division-multiplexed signal. At a receiver, a plurality of spread-spectrum despreaders despreads the code-division-multiplexed signal into a plurality of despread channels. A multiplicity of adders is electronically controlled by an adder-control signal. The multiplicity of adders adds several of the despread channels to generate a multiplicity of added channels. A multiplicity of FEC decoders generates a syndrome signal from an error rate of the multiplicity of added channels. A command processor determines, from the syndrome signal, a desired-data rate, and generates a data-rate command signal having the desired-data rate for the spread-spectrum transmitter. The command processor also generates the adder-control signal for adding together a number of despread channels of the plurality of despread channels, and generates a multiplexer signal having a number of decoded channels to multiplex together. The multiplexer multiplexes the multiplicity of decoded channels to generate an estimate of the input data.

Spread-spectrum communications utilizing variable throughput reduction

A system and method for adaptive-power control of a spread-spectrum transmitter of a mobile station operating in a cellular-communications network using spread-spectrum modulation. A mobile station transmits a first spread-spectrum signal. A base station has an automatic-gain-control circuit for generating an AGC-output signal, from a received signal. The received signal includes the first spread-spectrum signal and an interfering signal. The base station also has a correlator for despreading the AGC-output signal, a power-measurement circuit responsive to processing the received signal with the despread AGC-output signal for generating a received-power level, a comparator coupled to the power-measurement circuit for generating a comparison signal by comparing the received-power level to a threshold level, a transmitter for transmitting a second spread-spectrum signal, and an antenna. The mobile station has a variable-gain device responsive to the comparison signal for adjusting a transmitter-power level of the first spread-spectrum signal.

Spread spectrum adaptive power control communications system and method

A system and method for encoding and transmitting data with a spread-spectrum time-division-multiple-access (SS-TDMA) system. Data to be transmitted by a SS-TDMA transmitter are sent within a particular specified group of time slots. Random packets also can be sent by transmission during an open time slot. The TDMA data are demultiplexed into sub-data-sequence signals, each of which are spread-spectrum processed and then combined as a multichannel, BPSK, QPSK or QAM spread-spectrum signal. The multichannel spread-spectrum signal is concatenated with a header to output a packet-spread-spectrum signal which is transmitted over radio waves to a packet receiver. The packet receiver obtains timing for the multichannel spread-spectrum signal from the header. The multichannel spread-spectrum signal is then despread and multiplexed as received-TDMA data. The received-TDMA data are selected from a particular time slot by the intended recipient and stored in a receiver memory for output.

High processing gain spread spectrum TDMA system and method

A system for maintaining orthogonality among a plurality of spread-spectrum signals arriving at a base station from a plurality of remote units. Each spread-spectrum signal of the plurality of spread-spectrum signals from each remote unit of the plurality of remote units is transmitted as a packet having a header followed by data. A base station sends a plurality of adjustment signals over a communications channel to the plurality of remote units, respectively. At each remote unit, a circuit selects, from the plurality of adjustment signals, a received-adjustment signal designated for each remote unit. A chip-sequence generator, located at each remote unit, generates a chip-sequence signal assigned to a respective remote unit and, responsive to the adjustment signal, adjusts timing of a chip-sequence signal generated by the chip-sequence generator. A remote spread-spectrum spreader processes, using the chip-sequence signal generated by the chip-sequence generator, a header-symbol signal and a data-sequence signal as an RU-spread-spectrum signal. An RU-transmitter section, time synchronized responsive to the adjustment signal, sends the RU-spread-spectrum signal over the communications channel to the base station. A base-station despreader despreads the RU-spread-spectrum signal as a header and data. A comparator compares the header with a timing signal to generate the adjustment signal.

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Centerville, MA, United States of America

Joseph Garodnick