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| Number | Title | Issue Date |
| 7991013 | Digital receiver for radio-frequency signals A system and method for receiving radio frequency signals, comprising a plurality of analog signal couplers, for communicating a representation of a radio frequency signal; a respective analog to digital converter for each of said couplers, each having an output pre... | 08/02/2011 |
| 7936788 | Method and device for signal transporting A method for signal transporting in an optical transport network comprises: presetting frame structures for an optical channel payload unit OPUx and an optical channel data unit ODUx of a 5G-path transporting constant-bit-rate CBR5G rate-level signals in an optical ... | 05/03/2011 |
| 7894483 | Multi-carrier communication via sub-carrier groups One embodiment of the present invention relates to a method for communicating over a multi-carrier communication channel. In the method, sub-carrier frequencies that are reserved for communication between a pair of network nodes are associated with different sub-car... | 02/22/2011 |
| 7860130 | Communicating signals through two twisted pairs In one embodiment, a method includes communicating with a Digital Subscriber Line (DSL) transceiver unit through a first twisted pair that comprises a first plurality of wires, and communicating with the DSL, transceiver unit through a second twisted pair that compr... | 12/28/2010 |
| 7769051 | Optical transmission network with asynchronous mapping and demapping and digital wrapper frame for the same An optical transmission network is inherently asynchronous due to the utilization of a variable overhead ratio (V-OHR). The network architecture makes extensive use of OEO regeneration, i.e., deals with any electronic reconditioning to correct for transmission impai... | 08/03/2010 |
| 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 receives an indication message in reply to the request, and may detect t... | 10/21/2008 |
| 7436842 | Outlet with analog signal adapter, a method for use thereof and a network using said outlet An outlet for a Local Area Network (LAN), containing an integrated adapter that converts digital data to and from analog video signal. Such an outlet allows using analog video units in a digital data network, eliminating the need for a digital video units or externa... | 10/14/2008 |
| 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 selection apparatus includes a channel power measurement unit, a channel l... | 08/19/2008 |
| 7372893 | Device and method for compensating for phase distortion in base station of OFDMA-based cellular system Disclosed is a device and method for compensating for phase distortions in a base station of an OFDMA-based cellular system. The method comprises receiving OFDM symbols from a plurality of mobile stations, canceling a symbol guard interval using a reference timing s... | 05/13/2008 |
| 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 multiplexing to create a communication network thereon. Communication ... | 04/08/2008 |
| 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 within a multiple-dwelling unit and having one or more satellite televisi... | 04/01/2008 |
| 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 operating in a low-power state with the frequency and voltage of the e... | 03/04/2008 |
| 7274679 | Scalable virtual channel The present invention comprises aggregating a plurality of physical channels to a single logical channel, a scalable virtual channel (SVC). This may be implemented in a point to multipoint communications system. The present invention enables a variety of receivers, ... | 09/25/2007 |
| 7245581 | Method and apparatus for normalizing amplitudes of orthogonal frequency division multiplex (OFDM) signals A method and apparatus for processing Orthogonal Frequency Division Multiplex (OFDM) signals is described, in which OFDM signals are conditioned in an OFDM modulated on the transmitter side for each symbol of a data stream to be transmitted and sent as a multicarrie... | 07/17/2007 |
| 7230909 | Efficient activity resumption in point to multipoint service flow Orthogonal frequency division multiplexing (OFDM) is used to divide a single TDMA time slot into multiple non-contending access request opportunities that are reserved for particular subscriber units. An OFDM burst is divided into multiple tonesets where each tonese... | 06/12/2007 |
| 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 transmitted information that is used to identify the combining (inver... | 04/17/2007 |
| 7170850 | Transmission apparatus and method and providing medium thereof A transmission apparatus which prevents adversely affects from an adjacent channel even without provision of a guard band. An information sequence 1 input to a mapping unit 21-1 of the transmission apparatus is mapped onto predetermined signal p... | 01/30/2007 |
| 7171570 | 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 operating in a low-power state with the frequency and voltage of the e... | 01/30/2007 |
| 7151740 | Transmit power control for an OFDM-based wireless communication system An open loop power control system for an orthogonal frequency division modulation (OFDM)-based fixed/mobile wireless system. A preferred system and method comprise measuring signal strength of received interference-free pilot tones transmitted by a base station; det... | 12/19/2006 |
| 7149432 | Method and apparatus for equalization across plural data channels Optical equalization across N (an integer, N>1) channels of a multi-channel link of a communications network, is accomplished by averaging effects of optical performance variations within each of the M (an integer, M>1) parallel data signals. At a transmitting end n... | 12/12/2006 |
| 7133458 | Signal component demultiplexing apparatus, filter apparatus, receiving apparatus, communication apparatus, and communication method A communication apparatus, a signal component demultiplexing apparatus, and a filter apparatus for reducing a load of FFT processing in a receiver in multi-carrier communication, wherein the receiving apparatus provides a signal component demultiplexing apparatus be... | 11/07/2006 |
| 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 wideband-to-narrowband conversion method is the elimination of frequencies above 3400 ... | 09/26/2006 |
| 7110049 | Process and device for installing broadcast programs The invention relates to a method of installing a bouquet of digital broadcast programmes on the basis of transponders of different minimum symbol frequencies. The frequency band is traversed using a quantization interval corresponding to the minimum symbol frequenc... | 09/19/2006 |
| 7099268 | Orthogonal frequency division multiplex modem circuit To provide an orthogonal frequency division multiplex modem circuit which can multiplex signals, whose bit rates and QoS are different from one another, and can transmit the signals via one OFDM line. A serial/parallel converter converts input signals into a complex... | 08/29/2006 |
| 7050508 | Method and system for frequency up-conversion with a variety of transmitter configurations A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transm... | 05/23/2006 |
| 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 upstream and downstream digital data with the head end over the at le... | 04/18/2006 |
| 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, digital data to a head end of the network. The node also includes a data c... | 11/22/2005 |
| 6967997 | Multi-carrier connection initialization and symbol transmission A method of transmitting symbols in a wireline multi-carrier communication system in which each symbol is modulated for transmission over a carrier group of pre-determined size. The method involves, identifying all available carrier groups, and transmitting a replic... | 11/22/2005 |
| 6965581 | Transceiver in a two-way satellite system An apparatus for transmitting and receiving signals over a two-way satellite communication system is disclosed. A receiving unit receives data from a user terminal. A transmitting unit is coupled to the receiving unit and transmits the data to an antenna. The data i... | 11/15/2005 |
| 6956813 | Radio communication system, radio base-station apparatus, mobile radio-station apparatus, radio zone assignment method, and radio communication method A plurality of frequency-channels are provided, each composed of an OFDM multi-carrier. The OFDM sub-carrier of each channel is orthogonal to the sub-carrier of any other channel, so that two or more channels may be considered to transmit the same OFDM signal. Furth... | 10/18/2005 |
| 6928084 | 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 transmitted information that is used to identify the combining (inver... | 08/09/2005 |
| 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 signals, of modulating a plurality of sub-carriers with the modulation si... | 04/05/2005 |
| 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, respectively, so as to calculate a coefficient signal of each subcarrier.... | 06/08/2004 |
| 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 1/2. When the 2-demultiplexing filter bank operates on four types of fi... | 03/30/2004 |
| 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 the physical layer IC grants the desired access. Upon detec... | 11/04/2003 |
| 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 putting any signal into those sub-channels. Simple low data ... | 09/30/2003 |
| 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 by the groups are generated. A frequency modulation of a ca... | 09/23/2003 |
| 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 interval than the multiplexing frequency interval. Signals of... | 07/08/2003 |
| 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 constellation data. A receive correlates the received data using the ... | 11/26/2002 |
| 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 stacked IF carrier signal and upconverting the stacked IF c... | 11/05/2002 |
