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7391712 |
Method and system for forward-looking tone allocation
Methods and systems for forward-looking tone allocation are provided. In one embodiment, a method for an orthogonal frequency division multiplexing (OFDM) multipoint-to-point communications system...
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7391715 |
Transmitter device and transmitting method using OFDM and MC-CDMA
A transmitter device comprises an OFDM transmission unit, a MC-CDMA transmission unit, and a control unit for selecting either the OFDM transmission unit or the MC-CDMA transmission unit at slot...
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7391711 |
Method and system for adaptive modulation
Methods and systems for adaptive modulation are provided. In one embodiment, a method for a plurality of remote units of an orthogonal frequency division multiplexing multipoint-to-point...
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7388920 |
Apparatus and method for performing channel estimation in an orthogonal frequency division multiplexing (OFDM) system using multiple antennas
An apparatus and method for performing channel estimation in an OFDM (Orthogonal Frequency Division Multiplexing) system using multiple antennas, and a method for performing channel estimation...
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7388923 |
Method and system for adaptive control of sub-carriers
A method and system for adaptive control of sub-carriers is useful for increasing frequency diversity gain to improve bit error rate performance in an Interleaved Frequency Division Multiple Access...
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7386072 |
Orthogonal frequency division multiplexing (OFDM) system with channel transfer function prediction
Wireless communication systems are provided with an adaptive subcarrier loading function for a mobile receiver in a wireless communication system based on Orthogonal Frequency Division Multiplexing...
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7385916 |
System for multiple use subchannels
Systems for multiple use subchannels are provided. In one embodiment, a bidirectional communication system comprises: a first remote for communicating with a host using orthogonal frequency...
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7385915 |
Apparatus, and associated method, for facilitating communication allocation in a radio communication system
Apparatus, and an associated method, for facilitating optimization of the communication capacity of a communication system. A selector is coupled to receive channel state information associated...
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7382717 |
Method for generating better than root raised cosine orthogonal frequency division multiplexing (BTRRC OFDM)
An improved multicarrier modulation system and method is introduced which has the advantages of both isotropic orthogonal transfer algorithm orthogonal frequency division multiplexing (IOTA OFDM)...
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7382719 |
Scalable and backwards compatible preamble for OFDM systems
A method comprising encoding a plurality of signals according to a predetermined negation scheme and transmitting the plurality of signals, wherein each signal is transmitted by way of a wireless...
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7382718 |
Transmitting and receiving method for reducing distortion caused by a time-varying channel in an orthogonal frequency division multiplex system
Disclosed is a transmitting and receiving method for reducing a time-varying channel distortion in an orthogonal frequency division multiplex (OFDM) system. In the present invention, the...
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7379417 |
Orthogonal frequency division multiplexing transmitter system and VLSI implementation thereof
A system for transmitting data in wireless communication employing an improved orthogonal frequency division multiplexing (OFDM) transmitter is devised. The orthogonal frequency division...
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7379416 |
Forward packet data channel with parallel sub-packets
A method of time division multiplexing for a forward data packet channel includes encoding parallel data sub-packets into parallel streams of turbo codes; interleaving each of the parallel streams...
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7379741 |
Sub-carrier allocation method for reducing inter-cell interference in OFDM cellular environment
A sub-carrier allocation method including selecting a number of cells having a strongest inter-cell interference among cells in a multiple-cell environment, and selecting mutually exclusive...
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7376117 |
Interleaving circuit for a multiband OFDM transceiver
Interleaving circuit for a multiband OFDM (orthogonal frequency division multiplexing) transceiver of a ultra wide band wireless personal access network transmitting OFDM modulated symbols, wherein...
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7376075 |
Circular constellations with coherent gain/differential phase and pilots
The modulation method and system of the presented herein involves mapping data onto a constellations comprising a set of concentric circles in a two-dimensional plane, one dimension for the...
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7376202 |
OFDM peak-to-average power ratio reduction by combined symbol rotation and inversion with limited complexity
A signal scrambling method based on combined symbol rotation and inversion (CSRI) for the peak-to-average power ratio (PAPR) reduction of OFDM signals. By dividing OFDM sequences into subblocks and...
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7376074 |
Apparatus and method for transmitting and receiving side information of a partial transmit sequence in an OFDM communication system
An OFDM (Orthogonal Frequency Division Multiplexing) communication system that multiplexes data with a plurality of orthogonal sub-carrier frequencies, which includes a transmitter for converting a...
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7369531 |
Apparatus and method for transmitting/receiving a pilot signal for distinguishing a base station in a communication system using an OFDM scheme
A method for transmitting reference signals in a radio communication system in which a frequency band is divided into a plurality of sub-frequency bands. The reference signals are transmitted...
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7369485 |
Wireless receiver for sorting packets
A wireless receiver that sorts packets including a packet detector, multiple correlators, and multiple packet processors. Each correlator correlates a received signal according to packet type. Each...
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7369579 |
Method and system for timing controlled signal transmission in a point to multipoint power line communications system
Power line communication (“PLC”) signals are transmitted between a head-end PLC transceiver coupled to multiple remote PLC transceivers over a electric power and communications distribution...
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7366090 |
Apparatus and method for generating a preamble sequence in an OFDM communication system
A method for generating a preamble sequence in an orthogonal frequency division multiplexing (OFDM) communication system having A subcarriers in a frequency domain. The method comprises generating...
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7366089 |
Apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals
The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M...
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7366087 |
Delta-predicted frequency offset compensation apparatus and method thereof
Provided are delta-predicted frequency offset compensation apparatus and method that estimates an offset delta of forthcoming symbols by using a principle that the offset delta of a symbol in a...
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7366088 |
Method and orthogonal frequency division multiplexing (OFDM) receiver for reducing the influence of harmonic interference on OFDM transmission systems
A method and OFDM receiver are provided for reducing the influence of harmonic interference on OFDM transmission systems, wherein high interference unity is achieved by the simultaneous use of a...
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7359312 |
Method and apparatus for identifying an orthogonal frequency division multiplexing (OFDM) terrestrial repeater using inactive sub-carriers
A terrestrial repeater is disclosed for use in a satellite transmission system that may also include a plurality of satellites. The terrestrial repeaters are implemented as OFDM transmitters to...
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7359314 |
Signal transmission system for transmitting a signal with a guard interval and a demodulation method thereof
Difference between a received signal which is an OFDM modulated signal having a guard interval and a delayed signal acquired by delaying the received signal by time equivalent to a data interval is...
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7359366 |
Uplink ranging system and method in OFDMA system
Disclosed is a ranging system and method in an OFDMA system. The ranging system includes complex exponential twiddle storage units for respectively storing complex exponential twiddle factors...
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7359727 |
Systems and methods for adjusting transmit power in wireless local area networks
A communication station performs closed-loop transmit power control and adjusts its transmit power level based on an access point sensitivity, a path loss and/or a link margin variation. An average...
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7355961 |
Method and arrangement for digital signal transmission using layered space-time codes
The invention relates to a method and an arrangement for transmitting a digital signal consisting of symbols, which arrangement comprises a coder ( 308 ) for coding complex symbols to channel...
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7355959 |
Interference suppression for OFDM-based UWB communication
A method suppresses interference in a time-frequency hopped, ultra wide bandwidth system. Signals corresponding to a transmitted symbol are received. The received signals are frequency demodulated,...
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7355963 |
Tone allocation in multipoint-to-point communication using orthgonal frequency division multiplexing
Systems for tone allocation are provided. In one embodiment, a system comprises: a plurality of remote units and a host including a demodulator. Each remote transmits an upstream OFDM signal using...
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7356006 |
Method of overhead channel transmission in mobile communication system and apparatus using the same
A method of performing a reverse-link packet data service in a communication system is provided, by which a reverse packet data service is available at a high data rate in the reverse link...
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7355960 |
Channel estimation apparatus and method for adaptive channel allocation in an orthogonal frequency division multiple access system
A method and apparatus for defining at least one subcarrier as a subchannel, dividing a total frequency band into a plurality of subchannels, and allocating the subchannels to at least one mobile...
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7355962 |
Multi-carrier communications with group-based subcarrier allocation
A method and apparatus for subcarrier selection for systems is described. In one embodiment, a method for subcarrier selection for a system employing orthogonal frequency division multiple access...
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7355964 |
Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing systems
Systems for contention-based bandwidth requests in orthogonal frequency division multiplexing (OFDM) systems are provided. In one embodiment, a bi-directional communication system comprises: a...
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7352690 |
Ranging and round trip delay timing adjustment in a multi-point to point bidirectional communication system
A bidirectional communication system is provided. In one embodiment, a system comprises a plurality of remote units; a multipoint-to-point host unit communicatively coupled with a plurality of...
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7352779 |
System for multi-frame alignment
A bidirectional communication system is provided. In one embodiment, a system comprises a host; and a plurality of remote units, wherein a plurality of tones is shared among the plurality of remote...
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7352730 |
Joint channel and noise variance estimation in a wideband OFDM system
A method and system for use in a wireless-local-area network (WLAN), for simultaneously estimating the unknown multi-path channel and noise characteristics and using the channel and noise estimates...
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7352689 |
Method for optimizing phase factor of sub-block signal in partial transmit sequence orthogonal frequency division multiplexing system
A method for optimizing phase factors in partial transmit sequence orthogonal frequency division multiplexing system. The method includes initializing sub-block signals by applying an initial phase...
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7352716 |
Wireless network having IEEE802.11h-incompliant terminal wireless device communicating with IEEE802.11h-compliant base wireless device
In a wireless network structure which includes a wireless LAN device having a base station function (host device) which is compliant with IEEE802.11h and at least one wireless LAN device having a...
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7352691 |
Double difference phase detection
A method that allows a digital communications system to detect the presence of transmitted messages in noisy environments. The system includes an OFDM transmitter and an OFDM receiver. The OFDM...
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7349817 |
Apparatus and method for reducing peak-to-average power ratio in a broadband wireless communication system
An apparatus and method for PAPR reduction in a wireless communication system are provided. In the PAPR reducing apparatus, a first calculator calculates an ISF for each sample of baseband sample...
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7349325 |
Broadband over low voltage power lines communications system and method
A power line communications (PLC) system and method for providing broadband communications over a low voltage power line are disclosed. The system and method comprise a manager that controls access...
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7345990 |
Method and apparatus for performing digital communications
A wired and wireless communication method, and more particularly a method and apparatus for reducing a PAPR (Peak to Average Power Ratio) in an OFDM (Orthogonal Frequency Division Multiplexing)...
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7342910 |
Method of assigning a spreading sequence to a user of a telecommunications network
An apparatus and method for a Multi-Carrier Code Division Multiple Access (“MC-CDMA”) transmission network is disclosed. In the MC-CDMA transmission network a plurality of spreading sequences...
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7342958 |
System and method for enhancing throughput in an additive gaussian noise channel with a predetermined rate set and unknown interference
A system for, and method of, determining channel throughput achievable under superposition coding given a finite, predetermined set of allowed transmission rates and a related system for, and...
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7342872 |
Differential OFDM using multiple receiver antennas
Systems and methods for optimally receiving differential encoded OFDM signals via multiple antennas. These techniques may exploit spatial diversity without knowledge of channel characteristics....
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7342875 |
Space-time coded OFDM system for MMDS applications
A communications system includes a base station that is configured to transmit a signal that is modulated according to a predetermined modulation scheme and an orthogonal frequency division...
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7339911 |
Selection between two different coding schemes and corresponding modulation schemes according to the allowable transmission delay of the data
Transmitters comprising detectors ( 32 ) for detecting packet data to be transmitted are provided with selectors ( 34 ) for in response to detection results of real-time requirements selecting...
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