Matches 201 - 250 out of 417 < 1 2 3 4 5 6 7 8 9 >
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6452945 Electrical add-drop multiplexing for optical communications networks utilizing frequency division multiplexing  
A frequency division multiplexing (FDM) node used in optical communications networks provides add-drop multiplexing (ADM) functionality between optical high-speed channels, and low-speed...
6442179 Data storage communication channel and method of transmitting data  
A data storage communication channel includes a transmission medium, an initiator interface and a frequency selective multiplexer. The initiator interface includes first and second serial transmit...
6434119 Initializing communications in systems using multi-carrier modulation  
A variety of methods of initializing a connection between a remote modem and a central unit in a communication system that utilizes a multi-carrier modulation scheme are described. In one aspect of...
6430273 System and method of providing a bi-directional DSL connection  
A system for providing a bi-directional digital subscriber line connection to a network includes a digital subscriber line access multiplexer with a pool of digital subscriber line modems, and...
6424636 Variable rate and variable mode transmission system  
A public switched telephone network (PSTN) provides communication of digital data from a data provider or LAN to one or more of a plurality of subscriber premises. Asymmetrical digital subscriber...
6414968 Transmission and detection of data in a dual channel transceiver  
A dual channel transceiver which operates at two different frequencies and which may be used in a network using older transceivers operating at a single frequency is disclosed. A pilot tone is...
6389040 Apparatus and method for generating a frequency offset estimate for communication systems having frequency selecting fading channels  
A frequency offset estimation is generated without explicitly generating a channel estimation for a frequency selective fading communication channel. This is realized by recognizing that, in the...
6381251 Data transmission apparatus and receiving apparatus using orthogonal frequency division multiplex modulation system  
A data transmission apparatus of an orthogonal frequency multiplex modulation system wherein data is transmitted using a plurality of carriers which are in a mutually orthogonal relationship with...
6373859 Methods and apparatus for encoding and decoding data  
In a coded orthogonal frequency division multiplex (COFDM) system n-bit data words are encoded as 2 m -symbol code words (binary, quaternary, octary, etc.). The code words are selected for desired...
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...
6366309 Method for the terrestrially transmitting digital signals  
A method is proposed that is used for terrestrial transmission of at least one digital signal, in particular a digital radio and/or TV broadcasting signal. In this method, the at least one digital...
6363263 Universal wideband switchless channel selector  
A system and method for providing a particular wireless communication signal appearing within an antenna beam to a cellular base station to the exclusion of other communication signals also...
6363084 Method for estimating coarse frequency offset in OFDM receiver and apparatus employing the same  
A method and an apparatus for estimating coarse frequency offset in OFDM receiver are disclosed. The method for estimating coarse frequency offset includes the steps of: a) performing differential...
6359906 Providing digital services to telephone subscribers  
A local telecommunications network system IS arranged to provide a first asymmetric digital subscriber line (ADSL) service in a first frequency band to a first set of subscribers and a second very...
6356555 Apparatus and method for digital data transmission using orthogonal codes  
A method and apparatus for carrying out synchronous co-division multiple access (SCDMA) communication of multiple channels of digital data over a shared transmission media such as a cable...
6351473 Method to allocate data bits, multi-carrier transmitter and receiver using the method, and related allocation message generator  
In a multicarrier transmission system, a transmitter (T, T′) sends digital data packets (D) modulated on a set of carriers to a receiver (R, R′). A subset of the carriers constituting the set...
6351451 Digital multi-channel demultiplexer/multiplexer (MCD/M) architecture  
A computationally efficient digital signal processing (DSP) system is provided for multiplexing/demultiplexing a large number of closely spaced FDM channels. Sub-band definition filtering divides...
6349123 Asymmetric data transmission apparatus using asymmetric digital subscriber lines, and subscriber line connection method therefor  
An asymmetric data transmission apparatus using asymmetric digital subscriber lines, which connects a high-speed data network to telephone subscriber lines in response to a demand of a subscriber,...
6323804 Method and apparatus for GPS time determination  
A system for rapidly acquiring a time reference for the location determination of a wireless communication device. The system includes a wireless communication device (200), a GPS satellite (202)...
6317409 Residue division multiplexing system and apparatus for discrete-time signals  
A multiplexing system utilizes the whole transmission bandwidth without inducing interchannel interference for a linear channel with additive noise. Using the multiplexing system, the linear...
6314113 Method of determining a symbol transmission format in a transmission system and system  
A method and apparatus for determining the transmission format of complex symbols in a received signal which is formatted in complex symbol blocks. Each block has a first occurrence (GI k ) of a...
6314369 Communications navigation system, and navigation base apparatus and navigation apparatus both used in the navigation system  
In a communications navigation system, data is transmitted and received between a navigation base apparatus provided at a navigation base and each of a plurality of navigation apparatuses provided...
6310863 Dual-band data communication device  
The direction of rotation of the phase of signals in a dual-band digital demodulation processing means 110 and a dual-band digital modulation processing means 112 is controlled in accordance with a...
6304545 Method and circuit arrangement for the correction of phase and/or frequency errors in digital multicarrier signals  
In an OFDM system, the so-called self-noise component, which represents that noise component of the respective carrier which is caused by the carrier itself and is mapped onto itself, can be...
6301268 Communication method for frequency division multiplexing signalling systems with reduced average power requirements  
We describe an improved method for decreasing the probability of an unacceptably high peak-to-average power ratio in a signal to be transmitted by a Frequency Division Multiplexing (FDM) system,...
6301240 Centrally located equipment for wireless telephone system  
Simplified centrally located equipment for use in a wireless telephone system that uses of an existing broadband distribution network to carry telephony signals between an existing telephone...
6289308 Encoded wideband digital transmission signal and record carrier recorded with such a signal  
Reproduction accuracy of a digital signal, representing for example stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The...
6279158 Dynamic bandwidth allocation  
The communication system includes a hybrid fiber/coax distribution network. A head end provides for downstream transmission of telephony and control data in a first frequency bandwidth over the...
6256302 Method for the common transmission of digital and analogue modulated radio broadcasting and/or television broadcasting signals  
A method is described that is used for common transmission of digital- and analog-modulated radio and/or television signals, in particular over a broad band cable system (30). The method includes...
6256290 Multi-carrier CDMA transmission system with frequency and transmit diversity  
A wideband CDMA transmission system is disclosed that incorporates transmit diversity in both frequency and space. Some embodiments of the present invention are capable of transmitting a wideband...
6243397 Multi-carrier PC-CDMA system  
The present invention relates to a parallel combinatory CDMA (PC-CDMA) system that transmits and receives data by applying a predetermined pseudo number (PN) code corresponding to a plurality of...
6233254 Use of feature characteristics including times of occurrence to represent independent bit streams or groups of bits in data transmission systems  
A method and apparatus for simultaneously communicating a first data stream along with a second data stream. A first carrier is modulated with a first data stream and a feature of the modulated...
6208664 HDSL modules for telecommunications channel unit cards  
A telecommunications channel unit card including a subscriber bus interface for communicating subscriber bus signals with a digital loop carrier matrix, wideband channels for communicating wideband...
6201785 Process for transmitting a digitized signal according to OFDM type multicarrier modulation, transmitter and receiver for the implementation of the said process  
The present invention relates to a process for transmitting a digitized signal according to OFDM (Orthogonal Frequency Division Multiplexing) type multicarrier modulation using N orthogonal...
6202094 Adding links simultaneously to a multilink bundle using bandwidth allocation protocol  
In a point-to-point multilink bundle coupling two peers over a network, a simultaneous addition of a plurality of links may be performed using Bandwidth Allocation Protocol and Bandwidth Allocation...
6195364 VSDL multiple service provider interface  
A VDSL broadband communication network is provided with a single standard business system interface that supports multiple video/data service providers. A network entitlement manager is responsible...
6169751 OFDM receiving apparatus  
An OFDM receiving apparatus converts a received OFDM signal based on two sampling timing signals to detect reference symbols intermittently inserted in the OFDM signal. Based on the detected...
6169723 Computationally efficient analysis and synthesis of real signals using discrete fourier transforms and inverse discrete fourier transforms  
The present invention significantly reduces the number of complex computations that must be performed to compute a DFT or IDFT when a pattern is identified in an original input data sequence and is...
6157629 CDMA mobile communication system of automatically changing frequency and method thereof  
In a method of automatically changing a frequency in a CDMA mobile communication system where multiple frequencies are assigned to a base transceiver station, states of an RFC, ACC, and SIC are...
6148006 Communication system architecture, exchange having a plurality of broadband modems and method of supporting broadband operation on a one to one basis  
To reduce the complexity, size and power dissipation associated with the deployment of xDSL-type modems in distribution points (140-142) of a telecommunications network, a transparent concentrating...
6148007 Method for data transmission in a digital audio broadcasting system  
A method of broadcasting digitally encoded information includes the transmission of a plurality of orthogonal frequency division multiplexed sub-carriers. The sub-carriers are modulated by a...
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...
6128335 Software rate adaptable modem with forward compatible and expandable functionality and method of operation  
A high speed software modem is described which uses a selectable, desirable portion of the total available bandwidth of a transmission channel. In a preferred embodiment, the invention is...
6125103 Method and device for reducing the crest factor in digital transmission procedures  
The major problem in multicarrier transmission procedures consists in the very high crest factor of the transmit signal. This means, that very high signal peak values occur even with a moderate...
6115408 Automatic transmission power level control method in a frequency hopping communication system  
The present invention is an apparatus and method thereof for performing frequency hopping communication with another party over a subset of hopping frequencies from available frequencies. The...
6115407 Frequency hopping communication method and apparatus for modifying frequency hopping sequence in accordance with counted errors  
The present invention is an apparatus and method thereof for performing frequency hopping (FH) communication with another party over an available spectrum of frequencies. The spectrum is arranged...
6111919 Synchronization of OFDM signals  
A method is described for temporally aligning a received symbol that is transmitted via orthogonal channels, e.g., OFDM channels, with a reference symbol and/or an earlier received symbol. The...
6101172 Transmission spectra for HDSL2 transmission  
A PSD template for an HDSL2 transmission system includes three regions, a full-duplex region for both upstream and downstream transmission, and two half-duplex regions, a first duplex region for...
6097737 Method and apparatus for control of carrier frequency and modulation and for quantizing block data  
An information processing method an apparatus are described in which several items of information to be transmitted efficiently within a given frequency band to different receivers. The items of...
6088368 Ethernet transport facility over digital subscriber lines  
The present invention provides a facility transport system for transporting Ethernet over digital subscnber lines. The system, termed 10BaseS, is capable of transmitting 10 Mbps Ethernet over...
Matches 201 - 250 out of 417 < 1 2 3 4 5 6 7 8 9 >