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7620367 |
Frequency domain unscheduled transmission in a TDD wireless communications system
An apparatus and method exploits a variable frequency response of a radio channel in a time division duplex wireless communication system such that for unscheduled uplink transmissions, the...
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7620115 |
Space code block coding and spreading apparatus and method for transmission diversity and CDMA diversity transmitter and CDMA mobile station receiver using the same
A space code block coding and spreading apparatus for transmission diversity, a Code Division Multiple Access (CDMA) diversity transmitter using it, and a CDMA mobile station receiver for receiving...
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7620112 |
Adaptive basis functions in a multicarrier communication system
A method for transmitting a signal uses a channel impulse response to determine a sub-carrier frequency function for at least two different basis functions. For each of the at least two sub-carrier...
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7619964 |
High doppler channel estimation for OFD multiple antenna systems
Fast fading in cellular systems causes time variation of the Channel Impulse Response (CIR) resulting in significant performance degradation that is reduced by adding a pulse train to the...
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7616557 |
Method and apparatus for canceling intercarrier interference through conjugate transmission for multicarrier communication systems
A system and method for reducing ICI in multicarrier systems is disclosed. The system uses a primary transmission path to transmit a first signal using the same techniques as conventional OFDM and...
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7613245 |
Method and apparatus for multiplexing data and control information in wireless communication systems based on frequency division multiple access
An apparatus for transmitting data in a frequency division multiple access based communication system is disclosed. The apparatus includes a symbol block generator for generating a symbol block in...
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7613104 |
Method, apparatus and computer program product providing synchronization for OFDMA downlink signal
Disclosed is a method, a computer program product and a device that includes a receiver for receiving a downlink signal transmitted into a cell. The receiver is operable to obtain time, carrier...
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7609612 |
Multi-carrier transmitter for ultra-wideband (UWB) systems
System and method for a multi-carrier ultra-wideband (UWB) transmitter. A preferred embodiment comprises an UWB transmitter (for example, transmitter 300 ) taking advantage of both code division...
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7609611 |
Method for transmitting an offset modulated biorthogonal multicarrier signal (BFDM/OM)
The invention concerns a method for transmitting a biorthogonal multicarrier signal BFDM/OM, using a transmultiplexer structure providing: a modulating step, using a synthesis filter bank ( 11 ),...
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7606139 |
Preamble detection using frequency based correlation
A method for detecting a preamble location in a multiple preamble OFDM (Orthogonal Frequency Division Multiplexing) system is disclosed. An OFDM signal is generated with a plurality of frames, and...
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7606138 |
Multi-symbol encapsulated OFDM system
A method and system for communication of information in OFDM format are disclosed. The method employs multi-symbol encapsulation (MSE), wherein multiple OFDM symbols are grouped together in cyclic...
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7606137 |
Cancellation systems for multicarrier transceiver arrays
Frequency-dependent cancellation separates a plurality of interfering signals received by a plurality of receivers. Received wideband single-carrier signals or multicarrier signals are separated...
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7602855 |
Method and apparatus for singular value decomposition of a channel matrix
A method and apparatus for decomposing a channel matrix in a wireless communication system are disclosed. A channel matrix H is generated for channels between transmit antennas and receive...
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7599327 |
Method and apparatus for accessing a wireless communication system
Access to a wireless communication system ( 100 ) by a subscriber station ( 101 - 103 ) is facilitated by selecting ( 705 ) an access sequence from a set of sequences that have been identified to...
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7596181 |
Apparatus and method for frequency synchronization in OFDM system
A method and apparatus are provided for frequency synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) system, wherein the method includes the steps of transmitting OFDM symbols...
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7593754 |
Receiving apparatus and receiving method of communication system with multiple antennas
A receiving method and apparatus of an orthogonal frequency division multiplexing access system having multiple antennas that is capable of improving system design and realization of integration...
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7593729 |
Point to point link and communication method
A method and point-to-point link for providing point-to-point wireless communication between a first and second node forming a link, the method including providing multiple concurrent transmissions...
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7593378 |
SINR-based powerdown apparatus and method for a wireless communications systems
During the preamble interval of a wireless packet, a receiver estimates the SINR of the preamble, and also examines the packet header to determine the data rate, length, and destination address. If...
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7590183 |
Generating signals for transmission of information
A method for generating a signal is presented. The method includes selecting a first set of carrier frequencies that are integral multiples of a first frequency interval, and selecting a second set...
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7590045 |
Apparatus and method for transmitting fast feedback information in a wireless communication system
An apparatus is provided for transmitting uplink fast feedback information in a wireless communication system. In the apparatus, a channel encoder generates uplink fast feedback information to...
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7587212 |
System and method for allocating ranging slots in a broadband wireless access communication system
A method for determining a number of ranging slots by a base station (BS) in a broadband wireless access (BWA) communication system. The method includes counting the number of mobile stations (MSs)...
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7586988 |
Transmitting apparatus, receiving apparatus, communication system, and multiplex timing compensation method
This invention provides a transmitting apparatus including a plurality of signal generation units, a multiplexing unit which receives a plurality of signals output from the plurality of signal...
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7586837 |
Acquisition of a gated pilot signal
Systems and techniques are disclosed detecting an embedded signal which includes producing a plurality of first correlated values from a portion of the first signal and a second signal,...
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7586836 |
Apparatus and method for transmitting/receiving pilot signals in a communication system using an orthogonal frequency division multiplexing scheme
Disclosed is a method for providing a pilot symbol for base station identification in a Multiple-Input Multiple-Output (MIMO) communication system having one or more transmission antennas, wherein...
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7583766 |
System, and associated method, for utilizing block BLAST with PPIC in a MIMO multicode MC-CDMA system
A method for reducing interference in a MIMO MultiCode MC-CDMA system is disclosed wherein a BLAST algorithm is implemented over one block of correlation reception data y i and estimation channel...
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7583738 |
Apparatus and method for reducing peak-to-average power ratio in orthogonal frequency division multiplexing communication system
Provided is a method for reducing a PAPR (Peak-to-Average Power Ratio) of a transmit signal in a broadband wireless communication. The method includes the steps of: assigning information signals to...
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7583736 |
Radio transmission device, radio reception device, and method for selecting transmission cancellation subcarriers
Of systematic bits (S) and parity bits (P 1 , P 2 ) generated by coding (coding rate R=1/3) transmission bits, subcarriers to which parity bits are mapped are designated as candidates for...
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7583586 |
Apparatus and method for transmitting/receiving pilot signal in communication system using OFDM scheme
Disclosed is a method for transmitting a reference signal for identification of each cell in a communication system including a plurality of cells each of which is identified by a cell identifier....
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7583584 |
System and method for time diversity
A system and method for time diversity uses interleaving. To simplify the operation at both transmitters and receivers, a formula can be used to determine the mapping from slot to interlace at a...
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7580487 |
Apparatus and method for estimating a carrier to interference and noise ratio in a communication system
An apparatus and a method for estimating a carrier to interference and noise ratio (CINR) in a communication system. The CINR value is precisely estimated by removing the error floor value, which...
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7580446 |
Radio communication apparatus and radio communication method
Radio communication apparatus includes unit dividing transmit data into first-and-second streams, unit subjecting first-and-second streams to serial-to-parallel conversion to obtain data signals,...
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7577216 |
Guard interval and FFT mode detector in DVB-T receiver
For determining FFT and GI (guard interval) modes within a receiver, a correlation signal is generated from an in-phase and quadrature (I/Q) stream. An plurality of GI mode division signals are...
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7577087 |
Faster fine timing operation in multi-carrier system
There is provided a method, system and receiver for receiving data over a communication link. An energy of said signal in respect of an estimated guard interval position of said signal is defined....
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7574179 |
Mobile broadband wireless network with interference mitigation mechanism to minimize interference within a cluster during multiple concurrent transmissions
A mobile broadband wireless system including at least two pairs of nodes arranged in a cluster, each pair coupled to form a link for wireless communication. Each node includes an RF transceiver...
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7573807 |
Method and apparatus for performing differential modulation over frequency in an orthogonal frequency division multiplexing (OFDM) communication system
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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7573805 |
Data transmission and reception method and apparatus
A datastream of bits (which may itself be comprised of a plurality of datastreams as derived from a plurality of sources) are coded ( 21 ) and then interleaved ( 12 ) across a plurality of...
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7564909 |
Apparatus and method for detecting ranging signal in an orthogonal frequency division multiple access mobile communication system
An apparatus and method for receiving a ranging signal in an OFDMA mobile communication system are provided. The ranging signal receiving apparatus including, a ranging subchannel extractor for...
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7564908 |
Method and apparatus for encryption of over-the-air communications in a wireless communication system
A communication device converts a bit stream to multiple symbols and provides encryption at a physical layer by shifting a phase of each symbol of the multiple symbols to produce multiple encrypted...
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7561637 |
Determination of a channel estimate of a transmission channel
A method of determining a channel estimate of a first transmission channel in a communications system. The method comprises deriving a first set of channel estimates from symbols received through...
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7561628 |
Apparatus and method for cell acquisition and downlink synchronization acquisition in a wireless communication system
An apparatus and method for cell acquisition and downlink synchronization acquisition in an OFDMA wireless communication system are provided. In an SS apparatus in a broadband wireless...
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7561626 |
Method and system for channel estimation in a data transmission system
Improved techniques for estimating a channel (e.g., channel impulse response) in the time domain are disclosed. The improved techniques can be used to estimate time-domain channel taps in a digital...
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7561511 |
Configurable OFDM transceiver
A configurable Orthogonal Frequency Division Multiplexing (OFDM) device comprises a first transform stage configured to generate a first stage output having a first length, a second transform stage...
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7558238 |
Hybrid multiple access waveform, method, and apparatus
A method for partitioning communication resource among multiple users partitions a portion of an available communication resource into a series of time-frequency slots, and allows multiple users to...
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7554902 |
Preamble design for frequency offset estimation and channel equalization in burst OFDM transmission system
Provided is a transmission data frame in an orthogonal frequency division multiplexing (OFDM) burst mode transmission, and more particularly, a frequency offset estimating method and a channel...
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7551677 |
OFDM pilot tone tracking for wireless LAN
A pilot phase tracking loop for an OFDM receiver including a phase rotator receiving an incoming signal, a fast Fourier transform coupled to a phase rotator output, and a pilot phase error metric...
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7551545 |
Subband-based demodulation for an OFDM-based communication system
For subband-based OFDM demodulation, a “partial” Fourier transform is performed on a sequence of N input samples for an OFDM symbol to obtain N c received symbols for a group of N c data...
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7548522 |
Orthogonal frequency division multiplexing wireless communication operable on frequency selective channel, and channel compensation method
Disclosed is an OFDM (orthogonal frequency division multiplexing) wireless communication system operable on a frequency selective channel, and a channel compensation method. An IDFT (inverse...
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7545770 |
Radio communication system and radio communication method
This object is to conclude an agreement for making an insertion interval of a pilot signal variable between radio communication apparatuses and improve a throughput of a communication. A pilot...
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7542531 |
Digital cancellation of radio frequency interference
A method and system of canceling radio frequency interference (RFI) sourced from a narrow-band radio frequency transmitter to interfere with the operation of a multi-carrier modulation system. The...
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7542407 |
System and method for communicating digital information using time-and-frequency-bounded base functions
Systems and methods for efficiently conveying one or more broadband communication channels over a transmission medium. Communication is effected by transforming an incoming digital bit stream into...
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