Matches 151 - 200 out of 440 < 1 2 3 4 5 6 7 8 9 >
Match Document Document Title
7315563 Multicarrier orthogonal spread-spectrum (MOSS) data communications  
Systems and methods are described for multicarrier orthogonal spread-spectrum (MOSS) data communication. A method includes individually spread-spectrum modulating at least two of a set of...
7313174 Method for extracting a variable reference pattern  
A method is provided for extracting a sequence of pilot symbols enabling to estimate the transfer function of a transmission channel. At least a radiocommunication device communicates through the...
7310302 Method for estimating time and frequency offset in an OFDM system  
A synchronization technique computes, in the frequency domain, a differential-in-frequency function across a large number of OFDM tones, to develop robust estimates of time and frequency offset....
7310301 Multi-carrier modulation with source information allocated over variable quality communication channel  
A multi-carrier communication system ( 400 ) groups subchannels ( 802 ) into different quality-of-signal (QoS) regions ( 804 ). An unconstrained optimization process ( 1200 ) is performed...
7307943 Mobile station, base station, communication system, and communication method  
A mobile station, and corresponding system and method, the mobile station including an IQ multiplexer configured to IQ multiplex transmission data for a data channel and control data for a control...
7298691 Method and protocol to adapt each unique connection in a multi-node network to a maximum data rate  
A rate-adaptive mechanism for optimizing transmitter/receiver connections on a carrier-by-carrier basis for maximum date rate based on channel attributes for that connection and direction. Channel...
7292641 Apparatus and method for transmitting/receiving preamble sequence in orthogonal frequency division multiplexing communication system using plurality of transmission antennas  
A method for generating a preamble sequence in an OFDM (Orthogonal Frequency Division Multiplexing) communication system that uses A sub-carriers in a frequency domain and uses N Tx (Transmission)...
7292527 Residual frequency error estimation in an OFDM receiver  
An OFDM receiver configured for measuring frequency error based on comparing prescribed pilot tones from a prescribed group of consecutive symbols in a received OFDM signal. A complex conjugate...
7286514 Method for phase noise suppression for OFDM based WLANs  
Orthogonal frequency division multiplexing (OFDM) has been specified by IEEE 802.11a standard as the transmission technique for high-rate wireless local area networks (WLANs). Performance of an...
7280552 MC/CDMA data transmission method  
A method for MC-CDMA transmission of data between nodes of a network, including assigning to each node at least one spreading matrix, a set of data of at least one datum to be transmitted by a node...
7280464 Featureless synchronization in multi-user OFDM  
An orthogonal frequency division multiplexing (OFDM) communications system transmits data on a plurality of subcarriers and has a featureless synchronization signal. The OFDM communications system...
7280465 Frequency assignment in orthogonal multicarrier modulation  
A method for transmitting data between two nodes of an orthogonal frequency-division multiplexing network, including assigning to each node at least one transmit frequency set and one receive...
7277380 Synchronization of an orthogonal frequency division multiplexing (OFDM) receiver  
A method for frequency and time synchronization of a receiver for receiving Orthogonal Frequency Division Multiplexing (OFDM) signals is described. A quality criterion of a OFDM signal is...
7275224 Method for providing an area optimized binary orthogonality checker  
A method for minimizing the area of a binary orthogonality checker implemented in static CMOS circuits for minimizing the gate count and area needed for checker implementation. The method is...
7274744 Multicarrier communication system and reception device for same  
A reception device receives and demodulates, for each subchannel, data transmitted independently via three subchannels, which are a subchannel of interest and the two upper and lower adjacent...
7272108 Channel estimation in orthogonal frequency-division multiplexing (OFDM) systems  
A system and method for estimating channel characteristics in orthogonal frequency-division multiplexing (OFDM) systems with transmitter diversity is presented. The disclosed approach is compatible...
7272109 Modified OFDM subcarrier profile  
A 10 MHz channelized orthogonal frequency division multiplexing (OFDM) transmitter is provided that communicates using a modified OFDM packet structure with a half-rate oscillator having standard...
7266108 Method and apparatus for receiving diversity signals for use in OFDM radio communication system  
A diversity receiving apparatus for use in an OFDM transmission radio communication/broadcasting system where OFDM signals are received by a plurality of antennas and input into a plurality of...
7263058 Apparatus and method for generating preamble sequence in a BWA communication system using OFDM  
A preamble sequence generating apparatus and method in a BWA communication system using OFDM. An ARM code generator generates at least one ARM code of a different length. A sub-carrier selection...
7257077 Procedure for the recognition of active code sequences  
A procedure for determining active code sequences of a plurality of overlaid code sequences (c a (v)·g a ), wherein the active code sequences have a greater gain factor (g a ) than the inactive...
7254399 Techniques for interference reduction in wireless communications networks  
The present invention provides techniques for responding to overlapping conditions in wireless communications networks include receiving data transmissions from a transmitting device across a...
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...
7233566 Five-by-three wavelet transform apparatus  
In a 5×3 wavelet transform apparatus, a function-A module ( 11 ) calculates equations A1 and A2, a function-B module ( 12 ) calculates equations B1 and B2, function-C0 module ( 13 ) calculates an...
7233586 Procedure for the determination of the length of a standard code sequence of a CDMA signal  
Procedure for determining length (L preamble ) of a standard code sequence (preamble) transmitted in a CDMA signal in a defined code channel having a different code class than the code class of the...
7230908 Dynamic link assignment in a communication system  
An architecture for the dynamic assignment of links in a multi-user communication system. A plurality of information channels are provided in a forward communication link of the communication...
7227834 Synchronizing pulse generating method and method of receiving OFDM signal  
In an OFDM receiver, a synchronisation pulse for defining a Fast Fourier Transform window is generated by examining the output of a correlator to find a sub-interval within which there is maximum...
7224666 Estimating frequency offsets using pilot tones in an OFDM system  
A method for estimating carrier frequency offset (CFO) and sampling frequency offset (SFO) in an Orthogonal Frequency Division Multiplexing (OFDM) system having a plurality of pilot tones. The...
7221645 Pilot pattern design for a STTD scheme in an OFDM system  
The present invention relates to a transmitting device and a receiving device in a wireless orthogonal frequency division multiplex (OFDM) communication system with space time transmit diversity...
7218680 Retransmission techniques for enhanced performance in fading wireless communication channels  
A desired bit sequence (x) can be communicated over a wireless communication link ( 15 ) by including the desired bit sequence in each of a plurality of transmissions over the wireless...
7218691 Method and apparatus for estimation of orthogonal frequency division multiplexing symbol timing and carrier frequency offset  
A system and method estimates symbol timing of long training symbols and coarse carrier frequency offset in an orthogonal frequency division multiplexing receiver of a wireless local area network....
7218948 Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for generating channel quality indicators  
Pilot signal transmission sequences and methods for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is...
7218604 Orthogonal frequency division multiplexing system with differing control parameters corresponding to different data points in a single symbol  
A wireless transmitter (TX 1 ). The transmitter comprises circuitry for providing a plurality of control (CONTROL) bits and circuitry for providing a plurality of user (USER) bits. The transmitter...
7209460 Apparatus and method for assigning subcarrier in OFDMA communication system  
A subcarrier assignment apparatus and a subcarrier assignment method, in which each of a plurality of Base Stations (BSs) constituting an Orthogonal Frequency Division Multiple Access (OFDMA)...
7203157 Equalization method and device of the GMMSE type  
Exemplary embodiments of the invention provide an equalization method for a downlink channel in a telecommunication system transmitting MC-CDMA symbols on a plurality of carrier frequencies, in...
7203156 Communication system, base station apparatus, communication terminal apparatus and communication method  
In carrying out bidirectional communication with a base station device, one frame is prescribed for each predetermined time period Tf and a plurality of time slots are formed in one frame. In slots...
7200179 Data transmission method, data reception method, data transport method, data transmission device, data reception device, data transfer system, and communication terminal  
Input data is separated into a first data row and a second data row by a unit of a predetermined symbol. One of a plurality of orthogonal codes is selected in accordance with the separated second...
7200163 Method of splitting a signal and signal processing circuitry and apparatus utilizing the same  
A method of splitting a signal ( 10 ) into two parts ( 10″, 10′ ) is disclosed together with signal processing circuitry ( 22 ) for the same. The method comprises the steps of derotating the...
7197081 System and method for receiving OFDM signal  
A system for receiving an OFDM signal. An AD converter samples a received signal at a first sampling rate. A low pass filter removes noise from a signal outputted from the AD converter. A rate...
7190689 Retransmission control method and apparatus for use in OFDM radio communication system  
A retransmission control apparatus for use in a radio communication system that uses an orthogonal frequency division multiplexing technique, the apparatus comprising a transmitter which transmits...
7184393 Method and apparatus for multiuser access in a multicarrier modulation network  
A multiple access system for a network using multicarrier modulation. To contend for service a subscriber station selects an upcoming frame in whose contention window it will contend, selects a...
7177365 Space-time trellis code for orthogonal frequency division multiplexing (OFDM)  
A communication system for transmitting encoded signals over a communication channel is disclosed. The system includes a transmitter, which has a source that is configured to output a plurality of...
7173983 COFDM demodulator with FFT analysis window displacement compensation  
A COFDM demodulator including a fast Fourier transform circuit analyzing a received signal in a window corresponding to one symbol, each symbol carrying several phase and amplitude modulated...
7170954 Cayley-encodation of unitary matrices for differential communication  
Differential unitary space-time (DUST) communication is a technique for communicating via one or more antennas by encoding the transmitted data differentially using unitary matrices at the...
7167716 Synchronous demodulation apparatus of base transceiver station in interim standard-2000 system  
The present invention provides a synchronous demodulation apparatus of a base transceiver station in an Interim Standard-2000 (IS-2000) system, including a first synchronous demodulation unit, a...
7164649 Adaptive rate control for OFDM communication system  
Techniques to adaptively control the rate of a data transmission in a wireless (e.g., OFDM) communication system. In an aspect, various types of metrics may be derived and used to select the proper...
7164740 Wireless communication apparatus using fast fourier transforms to create, optimize and incorporate a beam space antenna array in an orthogonal frequency division multiplexing receiver  
A wireless communication apparatus which uses fast Fourier transforms (FFTs) in an orthogonal frequency division multiplexing (OFDM) receiver which incorporates a beam space antenna array. The beam...
7161985 Method and device for transmitting data on at least one electrical power supply line  
The orthogonal frequency division multiplexing (OFDM) method is well-known for transmitting data on electrical power supply lines. According to this method, the items of information to be...
7158576 Orthogonally-multiplexed orthogonal amplitude modulation method  
An orthogonally-multiplexed orthogonally-amplitude-modulated (OMOAM) method is disclosed. The OMOAM signal is constituted by orthogonally multiplexing M component signals, each constructed by a...
7151478 Pseudo-orthogonal waveforms radar system, quadratic polyphase waveforms radar, and methods for locating targets  
In some pseudo-orthogonal waveform embodiments, a radar system transmits pseudo-orthogonal waveforms and performs multiple correlations on a combined single receiver channel signal. In some...
7145862 Method and apparatus for transmission and reception of data  
To address the need for reducing pilot overhead, a method and apparatus for transmitting and receiving data is provided herein. A communication system having a transmitter ( 100 ) that utilizes...
Matches 151 - 200 out of 440 < 1 2 3 4 5 6 7 8 9 >