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US20070147226 METHOD AND APPARATUS FOR ACHIEVING FLEXIBLE BANDWIDTH USING VARIABLE GUARD BANDS  
Techniques to flexibly support different bandwidths in a wireless communication system are described. The system supports a configurable operating bandwidth using a fixed design bandwidth and...
US20070121485 SYSTEM AND METHOD FOR ADJUSTING A PID CONTROLLER IN A LIMITED ROTATION MOTOR SYSTEM  
A method is disclosed for adjusting a proportional, integral, derivative controller in a limited rotation motor system. The method includes the step of providing a first frequency domain sequence...
US20080037414 SYSTEM AND METHOD FOR MULTIFRAME ALIGNMENT IN A MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM  
Systems and methods for multiframe alignment in a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a method for communicating a...
US20090238065 SYSTEM AND METHOD FOR CONTENTION BASED TONES IN A MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM  
Systems and methods for round-trip-delay adjustment in a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a method for a remote unit to...
US20080107200 Preamble detection and synchronization in OFDMA wireless communication systems  
An embodiment of the invention is a technique for preamble detection and synchronization. A symbol correlation of a sequence of symbols is computed in a correlation window using one of a...
US20080056119 SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING  
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprising: a receiver configured to receive symbols from at least one of...
US20050265225 MIMO system and mode table  
A method for determining antenna usage in a multiple input multiple output (MIMO) wireless communication system. The method includes exchanging information between terminals concerning the number...
US20080225692 SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING  
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a multi-carrier modem comprises:a receiver configured to de-modulate symbols from at least one...
US20080037415 SYSTEM AND METHOD FOR RANGING IN A MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM  
Systems and methods for ranging in a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a method for ranging comprises: receiving at a...
US20080031128 APPARATUS AND METHOD FOR TRANSMITTING UPLINK DATA IN BROADBAND WIRELESS COMMUNICATION SYSTEM  
An apparatus and method for transmitting uplink data by a subscriber station in a broadband wireless communication system are provided. The apparatus includes a generator for generating a random...
US20080025201 SYSTEM AND METHOD FOR RANGING AND ROUND TRIP DELAY ADJUSTMENT IN A MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM  
Systems and methods for ranging and round trip delay adjustment in a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a...
US20070189151 METHOD AND APPARATUS FOR PERFORMING UPLINK TRANSMISSION IN A MULTIPLE-INPUT MULTIPLE-OUTPUT SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM  
A method and apparatus for performing uplink transmission in a multiple-input multiple-output (MIMO) single carrier frequency division multiple access (SC-FDMA) system are disclosed. At a wireless...
US20050152266 Apparatus and method for canceling interference signal in an orthogonal frequency division multiplexing system using multiple antennas  
An apparatus and method for canceling interference in an OFDM system using multiple antennas, where based on error estimation of a symbol received from a receive antenna, the error of a symbol...
US20050074037 Optical sub-carrier multiplexed transmission  
Apparatus for generating and receiving optical sub-carrier multiplexed signals has a digital signal processor for performing a Fourier transform, to generate or receive the optical sub-carrier...
US20090268604 APPARATUS AND METHOD FOR REDUCING PAPR OF PREAMBLE SIGNAL IN DIGITAL BROADCASTING SYSTEM  
A method and apparatus for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system are provided. Reserved tones are determined, and the determined reserved tones are used to...
US20060083160 Apparatus and method for estimating uplink frequency offset in an orthogonal frequency division multiplexing communication system  
An apparatus and method for estimating and correcting an uplink frequency offset in an OFDM communication system are provided. A subscriber station (SS) once repeats an OFDM symbol including a...
US20080279091 Fourier-transform based linear equalization for MIMO CDMA downlink  
In the reception of a downlink MIMO CDMA signal, the receiving unit performs a simplified process of linear equalization that eliminates the need for inverting the correlation matrix. The...
US20090067319 SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING  
Systems and methods for orthogonal frequency division multiplexing are provided. In one embodiment, a method for ranging comprises: receiving at a host a plurality of upstream symbols transmitted...
US20090185476 DURATION-SHORTENED OFDM SYMBOLS  
A communications network comprises a base station (28) and a wireless terminal (30) which communicate a frame (F) of information over an air interface (32). The frame (F) is prepared or processed...
US20080219148 SYSTEM AND METHOD FOR TRANSMITTING DATAIN A MULTIPLE-BRANCH TRANSMITTER-DIVERSITY ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING (OFDM) SYSTEM  
A system and method for transmitting data in multiple-branch transmitter-diversity OFDM systems is presented. In one embodiment, an approach is taken where an inverse Fourier transform (IFT) is...
US20050270969 Apparatus and method for providing a broadcasting service in a mobile communication system  
An apparatus and method for providing a broadcasting service in a mobile communication system. The apparatus and method can transmit broadcasting service data using orthogonal frequency division...
US20090323510 Modulation and demodulation of OFDM signals  
The invention relates to a method for modulating sub-carrier symbols to an intermediate-frequency OFDM signal having even and odd samples, including following steps: transforming a number N of the...
US20080049602 APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING SIDE INFORMATION OF A PARTIAL TRANSMIT SEQUENCE IN AN OFDM COMMUNICATION SYSTEM  
An Orthogonal Frequency Division Multiplexing (OFDM) communication system that multiplexes data with a plurality of orthogonal sub-carrier frequencies, which includes a transmitter for converting...
US20060274641 Method and apparatus for constant envelope orthogonal frequency division multiplexing in a wireless system  
In a wireless communication system comprising at least one wireless transmit/receive unit (WTRU), a base station, and a radio network controller (RNC), a method for constant envelope orthogonal...
US20060098570 OFDMA system and method  
A cellular wireless system using a single frequency OFDMA channel. Base stations include means for synchronization in frequency and time for control purposes. The synchronization means include...
US20050286409 Apparatus and method for transmitting/receiving uplink random access channel in mobile communication system  
An apparatus and method for transmitting/receiving an random access channel (RACH) signal in a broadband wireless communication system where a total uplink frequency band is divided into M...
US20090245092 APPARATUS, PROCESSES, AND ARTICLES OF MANUFACTURE FOR FAST FOURIER TRANSFORMATION AND BEACON SEARCHING  
In embodiments, a wireless receiver employs a hardware-based Fast Fourier Transform (FFT) engine controlled by firmware. The FFT engine executes tasks stored in a task list. Each task is...
US20050063297 Receiver for burst signal including known signal  
A burst signal receiver comprises a correlation computation unit configured to compute a correlation value between a received known signal and a generated known signal, a moving average calculator...
US20050201270 Method and apparatus for transmitting and receiving pilot signals in an orthogonal frequency division multiple access system  
A method and apparatus are provided for transmitting and receiving pilot signals to estimate link gains and channels of neighboring base stations in an orthogonal frequency division multiple...
US20090296563 TRANSMISSION APPARATUS, TRANSMISSION METHOD, RECEPTION APPARATUS, AND RECEPTION METHOD  
A disclosed transmission apparatus includes a multiplexing portion that multiplexes a common pilot channel, a shared control channel, and a shared data channel; a symbol generation portion that...
US20060250944 Apparatus and method for transmitting bit-interleaved coded modulation signals in an orthogonal frequency division multiplexing system  
Disclosed is an apparatus for transmitting a bit-interleaved coded modulation (BICM) signal in an orthogonal frequency division multiplexing (OFDM) system. A serial-to-parallel (S/P) converter...
US20050281188 Transmitter and receiver for fast frequency hopping based on a cyclic frequency hopping pattern in an orthogonal frequency division multiplexing system  
A transmitter and receiver for fast frequency hopping based on a cyclic frequency hopping pattern in an orthogonal frequency division multiplexing system. The transmitter outputs a transmission...
US20050099939 Apparatus and method for transmitting/receiving pilot signals in an OFDM communication system  
A radio communication system divides an entire frequency band into a plurality of subcarrier bands, forms a symbol from signals on the subcarrier bands, forms a frame from a plurality of symbols,...
US20090067528 LINK-ADAPTATION SYSTEM IN MIMO-OFDM SYSTEM, AND METHOD THEREFOR  
A system for link adaptation in a MIMO-OFDM system. In this system, the V-BLAST processor (308) performs V-BLAST processing and separates receive signals for the multiple antennas of the...
US20080192622 CONTROL CHANNEL SIGNALING IN A MULTIPLE ACCESS WIRELESS COMMUNICATION SYSTEM  
A novel and useful method and system for control channel signaling for use in multiple access wireless communication systems. The control message portion of the frame is divided into two portions:...
US20070230328 Radio communication apparatus and radio communication unit  
The radio communication apparatus includes: one or more radio units each with one or more antennas; a plurality of baseband processing units which perform baseband signal processing of signals,...
US20080084943 Apparatus and method for estimating channels in mobile communication system by using hidden pilots  
Provided is an apparatus and method for estimating channels in a mobile communication system by using hidden pilots. In a method for transmitting data in the mobile communication system, a...
US20080095280 Correlation value calculation method and correlator using the same  
Object: Even in the case where a receiving signal including a long delayed path having an equivalent power are received, deterioration of the receiving characteristics caused by inter symbol...
US20150382237 NETWORK APPARATUS BASED ON ORTHOGONAL FREQUENCY-DIVISION MULTIPLEXING (OFDM) AND DATA COMPRESSION AND DATA RECOVERY METHOD THEREOF USING COMPRESSED SENSING  
A network apparatus as well as a data compression and data recovery method thereof using compressed sensing (CS). According to an exemplary embodiment, the data compression and recovery method may...
US20090303868 Control Channel Transmission Method And Radio Communication Apparatus  
A control channel transmission method in a radio communication apparatus which has a plurality of antennas, including, generating signal which are orthogonal to each other on a frequency axis...
US20090040919 Transmission Using Nested OFDMA  
A transmission of information within a wireless cellular network may include a first and second group of samples. A first group of samples is created comprising at least a first and a last...
US20050122896 Apparatus and method for canceling interference signal in an orthogonal frequency division multiplexing system using multiple antennas  
In an encoding apparatus in a mobile communication system using a plurality of antennas, a puncturer punctures input coded bits in an RCP (Rate-Compatible Puncturing) method, a distributor divides...
US20050152267 Apparatus and method for canceling interference signal in an orthogonal frequency division multiplexing system using multiple antennas  
A receiving apparatus and method for receiving signals through a plurality of receive antennas in a mobile communication system. In the receiving apparatus, a plurality of FFTs transform...
US20070133393 Multi-carrier receiving method and multi-carrier receiving apparatus  
In a multi-carrier communication method that receives and demodulates a signal to which a guard interval has been attached for every group of a plurality of multi-carrier transmission symbols, the...
US20060159006 Apparatus and method for reducing an error vector magnitude in an orthogonal frequency division multiplexing receiver  
An apparatus and a method for reducing an error vector magnitude in an orthogonal frequency division multiplexing (OFDM) receiver. The method includes the steps of inputting a receiving symbol...
US20080316911 Simultaneous Cell Group and Cyclic Prefix Detection Method, Apparatus and System  
A method, and associated apparatus and system, for simultaneous cell group and cyclic prefix (CP) detection, having the steps of determining primary synchronization signal (P-SyS) timing τ using...
US20100182899 OFDM Time Basis Matching With Pre-FFT Cyclic Shift  
In OFDM communication, a pre-FFT cyclic shift is used to achieve time basis matching among symbols, and/or between symbols and their corresponding channel estimates.
US20080181097 METHOD AND OFDM RECEIVER WITH MULTI-DIMENSIONAL WINDOW PROCESSING UNIT FOR ROBUSTLY DECODING RF SIGNALS  
The invention enhances channel correction techniques for orthogonal frequency division multiplexing (OFDM) systems so that higher effective data rates can be achieved with a minimal processing...
US20080095040 METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING ACK/NACK SIGNAL TO SUPPORT HYBRID AUTOMATIC REPEAT REQUEST FOR MULTI-LAYER TRANSMISSION  
A method and apparatus for transmitting an Acknowledge (ACK)/Non-Acknowledge (NACK) signal to support Hybrid Automatic Repeat reQuest (H-ARQ) in an Orthogonal Frequency Division Multiplexing...
US20080080598 Method and apparatus for processing communication using different modulation schemes  
A transmitter and method for processing a digital data stream is disclosed. The transmitter includes a mode controller that selects one of a first mode or a second mode such that the transmitter...

Matches 1 - 50 out of 97 1 2 >