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7593473 |
Tree structured multicarrier multiple access systems
A Tree-structured multicarrier multiple access communication system in a multiple access environment having a number of interfering signals. In one embodiment an environment estimator estimates and...
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7558327 |
Pattern position measuring device, method, and program, and record medium on which the program is recorded
The position of a specific pattern such as a known symbol in a signal such as an OFDM signal is estimated with high accuracy. An effective symbol extraction section extracts a known symbol...
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7526018 |
Multi-standard transceiver for supporting wireless communications in 2.3-2.4 GHz band
Disclosed herein is a multi-standard transceiver for supporting a plurality of time division deplexing wireless communication standards. The multi-standard transceiver has a Multi-Mode Modem (MMM),...
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7453895 |
Outlet with analog signal adapter, a method for use thereof and a network using said outlet
An outlet ( 70, 75, 76, 78, 79 ) for a Local Area Network (LAN), containing an integrated adapter ( 21, 25 ) that converts digital data to and from analog video signal. Such an outlet allows using...
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7440459 |
Methods of detecting protocol support in wireless communication systems
In a method of detecting whether a given node supports a given protocol version, a source node sends a request message to the destination mode based on a first protocol version. The source node...
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7414993 |
Intelligent channel selection apparatus and method against various interferers in wireless communication systems and receiver using the same
Disclosed herein is an intelligent channel selection apparatus and method against various interferers in wireless communication systems, and a receiver using the same. The intelligent channel...
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7356048 |
Method and apparatus for network modems on a shared communications channel
A network modem which interfaces, in an embodiment of the invention, with existing wired media within a home. The network modems couple to an existing shared medium and utilize frequency division...
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7352991 |
Satellite signal distribution systems
Various configurations and equipment are described for providing satellite television programming from multiple satellite antennas to receivers, particularly to receivers located in apartments...
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7340622 |
Method and apparatus for selectively increasing the operating speed of an electronic circuit
One embodiment of the present invention provides a system that facilitates selectively increasing the operating frequency of an electronic circuit, such as a computer system. The system begins by...
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7206317 |
OFDM communication system and method having a reduced peak-to-average power ratio
An OFDM system embeds sequence information in the transmitted signal that reduces peak average power ratio (PAP) with minimal impact on the overall system efficiency. A marker is embedded onto the...
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7113522 |
Enhanced conversion of wideband signals to narrowband signals
Wideband speech signals must be converted to narrowband speech signals if the transmission medium or the destination terminal is constructed with narrowband constraints. A typical...
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7031335 |
Digital node for hybrid fiber/coax network
An optical distribution node is provided. The optical distribution node includes a laser transceiver that is coupleable to at least one fiber optic link. The optical distribution node communicates...
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6967966 |
Digital return path for hybrid fiber/coax network
An optical distribution node for an hybrid fiber/coax network is provided. The optical distribution node includes a laser transmitter coupleable to a fiber optic link that transmits upstream,...
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6876672 |
Method of transmitting data on multiple carriers from a transmitter to a receiver and receiver designed to implement the said method
A method of transmitting data on multiple carriers is disclosed, the method consisting, on a transmitter side, of binary to signal coding of the data to be transmitted so as to form modulation...
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6747945 |
OFDM transmitting and receiving apparatus and OFDM transmitting and receiving method
An average value of reception power of subcarriers A to D is calculated by a control circuit 162 , and the average value is divided by envelops of received signals of subcarriers A to D,...
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6714529 |
Variable transmission rate digital modem with multi-rate filter bank
A signal demultiplexer includes serially-connected 2-demultiplexing filter banks, including band-stop filters and down-samplers for culling sampling frequencies of output signals from filters to...
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6643723 |
Method and apparatus for releasing bus control by a device connected to the bus
In a digital bus, such as the IEEE 1394 serial bus, the procedure for sending data from a link layer IC onto the data bus is that the link layer IC requests access to the bus and then waits until...
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6628673 |
Scalable communication system using overlaid signals and multi-carrier frequency communication
A communication system such as an OFDM or DMT system has nodes which are allowed to transmit continuously on one or just a few of the sysiem's frequency sub-channels, while the other nodes avoid...
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6625174 |
Method for transmitting data packets on carrier frequency with linear variation and transmitter implementing this method
A method for transmitting data packets having a heading followed by a data field. The data of the field is transmitted by groups of symbols. According to the OFDM technique, subcarriers modulated...
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6590871 |
Multi-carrier modulation apparatus and transmitter using the same
A multi-carrier modulation apparatus to which transmultiplexers are applied. A multiplexing signal is treated as a synthesis of a plurality of multiplexed signals which are separated by a wider...
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6487252 |
Wireless communication system and method for synchronization
An orthogonal frequency division multiplexed wideband communication system provides improved time and frequency synchronization by inserting an unevenly spaced pilot sequence within the...
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6477182 |
Data transmission method and apparatus
A method and apparatus for modulating a plurality of information signals onto respective unique intermediate frequency (IF) carrier signals, summing the respective IF carrier signals to provide a...
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6449258 |
Intermediate repeater for a communication network for the reception and forwarding of frequency multiplexed signals
An intermediate repeater that can make available at least a minimum of information to the end user sites connected with it even in the event of a power failure. The intermediate repeater has a...
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6449262 |
Method and apparatus for frequency shifting with a clock signal
A physical layer device (PHY) device in a home LAN employs discrete multitone technology (DMT). The DMT system enables usage of existing residential wiring, which typically is telephone system...
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6345036 |
OFDM transmitting/receiving device and method
An average value of reception power of subcarriers A to D is calculated by a control circuit 162 , and the average value is divided by envelops of received signals of subcarriers A to D,...
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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,...
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6219333 |
Method and apparatus for synchronizing a carrier frequency of an orthogonal frequency division multiplexing transmission system
A system for synchronizing a carrier frequency of an orthogonal frequency division multiplexing (OFDM) transmission apparatus, even when a carrier frequency offset is above a frequency bandwidth of...
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6088381 |
System for transporting frequency hopping signals
A system for transporting radio frequency (RF) signals across a RF network comprises a central transport unit and a remote transport unit. The frequencies of at least some of the RF signals to be...
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6064665 |
System and method for single to two-band personal communication service base station conversion
CDMA (Code Division Multiple Access) communications systems and methods for performing a single to multiple frequency band conversion for mobile communications. The systems and methods include...
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5926783 |
Switchable dividing network
The switchable dividing network includes two individual filters whose center frequencies are selected from the group consisting of f a /8, 3f a /8, 5f a /8 and 7f a /8. The passband of its...
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5887023 |
Method and apparatus for a frequency hopping-spread spectrum communication system
The spread spectrum communication system of the present invention is intended to equalize link capacity by taking deterioration of link quality so as to enable reliable communication which enhances...
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5722040 |
Method and apparatus of frequency generation for use with digital cordless telephones
Methods and apparatus for digital cordless telephone systems are preferably implemented in an integrated circuit chip set having one or more chips, adapted to receive a voice signal, for converting...
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5659546 |
Wideband frequency signal digitizer and method
A wideband frequency signal digitizer and method for digitizing multiple bands of a wideband frequency signal. The digitizer and method providing for optimally positioning a segment (402) of the...
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5604746 |
Digital data receiver
A digital data receiver having a converter for frequency conversion of the input high frequency digital orthogonal modulation signal in a fixed intermediate frequency band, a demodulator for...
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5559809 |
Transmit block up-converter for very small aperture terminal remote station
A transmit block up-converter is provided for processing a multiplexed signal including a transmit IF signal, a reference frequency signal, a switching signal, a level signal and a constant-current...
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5557617 |
Frequency division switching using RF buss
A system and method for isolating a data or circuit signal, where the circuit signal has been frequency spread modulated with other such signals onto a beam signal and which beam signal has been...
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5533030 |
Radiotelephone system with the character of a local or auxiliary communications apparatus
A transmission process with specific adaptive properties in an analog or mixed analog-digital transmission system, having a fixed base station and a number of subscriber station independent of one...
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5519732 |
Digital baseband to IF conversion in cellular base stations
A system and method for converting and combining multiple digital baseband signals into a composite IF signal for subsequent up converting and transmitting as an RF signal. The system and method...
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5396489 |
Method and means for transmultiplexing signals between signal terminals and radio frequency channels
A method and apparatus are provided of transmultiplexing a plurality of signals between a plurality of signal terminals (17 or 29) and a plurality of selected radio frequency channels. The method...
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5339184 |
Fiber optic antenna remoting for multi-sector cell sites
A base station in a cellular communications system is connected to a plurality of remote cellular sites by a communications link having a base terminal coupled to a remote terminal by two optical...
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5251218 |
Efficient digital frequency division multiplexed signal receiver
A digital radio frequency (RF) or intermediate frequency (IF) receiver for frequency division multiplexed (FDM) signals contained in a predetermined FDM band including an RF amplifier, an RF...
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5058138 |
Modular receiver for signals having multiple channels and multiple formats
Disclosed is an apparatus for receiving a selected channel of a signal having a plurality of channels, each channel having a plurality of subchannels. A parabolic reflector, low noise amplifier and...
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5052024 |
Offset frequency multipoint modem and communications network
In a multipoint data communications system used with analog communications channels that may insert undesirable frequency offsets in a modem carrier frequency, a slave modem that adjusts its...
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4999831 |
Synchronous quantized subcarrier multiplexer for digital transport of video, voice and data
This invention addresses the digital transmission of wideband video, narrowband audio, and digital information over information networks. More specifically, the invention involves synchronous...
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4984219 |
Method and apparatus for decoding of frequency inversion based scramblers
A method and apparatus for decoding of frequency inversion based scramblers is disclosed. A quadrature amplitude modulation detector determines the frequency of the tone used for inverting the...
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4768187 |
Signal transmission system and a transmitter and a receiver for use in the system
A signal channel system which is particularly suitable for the employment of direct conversion receivers has a block of adjacent transmission frequency bands allocated to it. Each signal channel is...
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4639935 |
Apparatus for correcting frequency-dependent attenuation of the transmitting medium in signal transmission
Digital signals which are sent each with their own frequency are corrected for frequency-dependent attenuation of the transmitting medium in a filter (5) so as to maintain a desired relationship...
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RE32327 |
Multiple channel data communication system
A multiple channel communications system and method for communication among multiple channels using a channel selectable MODEM. The system is comprised of a coaxial cable, a variety of interface...
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4630282 |
Frequency-hopping digital data link
Ordinary digital data is reformed and time shifted such that it may be broadcast over a radio link which periodically shifts its frequency. The system of this invention utilizes timing information...
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4626913 |
Chroma burst derived clock regenerator for teletext decoder
A color reference signal produced by a color oscillator is coupled to a frequency converter that generates a signal having a frequency that is a multiple of that of the color reference signal. The...
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