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US20090316589 |
Method of Determining True Error Vector Magnitude in a Wireless Lan
Systematic transmit IQ phase and amplitude imbalances in the transmit chain of a wireless local area network (WLAN) cause a corresponding systematic shift in the roots of a constellation diagram....
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US20090316801 |
Radio Device, Electronic Device, and Imaging Device
A radio device for transmitting or receiving desired information through an MIMO transmission line, and an electronic device and an imaging device which have the radio device and supplied with...
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US20090316621 |
METHODS AND APPARATUS FOR PERFORMING TIMING SYNCHRONIZATION WITH BASE STATIONS
A wireless terminal using OFDM signaling supporting both terrestrial and satellite base station connectivity operates using conventional access probe signaling in a first mode of operation to...
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US20090316815 |
METHODS AND SYSTEMS FOR OVERHEAD REDUCTION IN A WIRELESS COMMUNICATION NETWORK
Methods and apparatus are provided for increasing throughput in a wireless communication system by reducing the amount of overhead transmitted to certain user terminals. Overhead due to control...
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US20090315632 |
Modulation Circuit, Modulation Method, Program and Communication Apparatus
There is provided a modulation circuit including a sampling unit that over-samples an input digital signal based on a multiplying clock signal, and outputs a first over-sampling signal, a first...
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US20090316819 |
TRANSMITTER
A transmitter employing an OFDM system, having a phase rotating portion which gives a same phase rotation amount to each group configured with a plurality of consecutive subcarriers modulated by...
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US20090316813 |
Transmitter, Receiver, Transmission Method and Reception Method
A phase relationship between signal sequences obtained by space-time-coding transmission signals is controlled so as to give a difference in peak power between the signal sequences to be...
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US20090316680 |
TDS-OFDMA COMMUNICATION CINR ESTIMATION
In a TDS-OFDM communications system, within a frame time, a transmitted signal comprising a preamble, a downlink sub-frame, and an uplink sub-frame. Within the downlink sub-frame, interposed...
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US20090318183 |
METHOD, APPARATUS AND COMPUTER PROGRAM FOR DOWNLINK MU-MIMO POWER SETTINGS AND CONTROL
A set of J predetermined power level offsets that scale transmission power per user are stored in a local computer-readable memory. A set of N users to which are allocated overlapping downlink...
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US20090316811 |
DATA COMMUNICATION METHOD, COMMUNICATION SYSTEM AND MOBILE TERMINAL
In a communications system which complies with LTE including a base station 2 which transmits data by using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access...
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US20090316635 |
Method and frame structure for supporting dynamic channel allocation and dynamic power allocation in frequency reuse partitioning based OFDMA system
Provided are a dynamic channel/power allocation method for an FRP-based OFDMA system and a frame/slot structure. capable of supporting the dynamic channel/power allocation method. In the FRP-based...
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US20090316818 |
RECEIVER
A receiver employing an OFDM system which uses a frequency band that is constituted by a plurality of subchannels, and receiving a signal added a phase rotation which is made to respectively differ...
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US20090316806 |
METHODS AND SYSTEMS FOR UTILIZING A MULTICAST/BROADCAST CID SCHEDULING MAC MANAGEMENT MESSAGE
Methods and systems for utilizing a multicast/broadcast connection identifier (CID) scheduling message in an orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division...
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US20090316803 |
MIMO RECEIVER
In a MIMO receiver, initial solutions using sub-optional decoding algorithm are determined for the symbols transmitted from each of a number of transmit antennas at a given time ( 100 ). The...
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US20090316802 |
MULTI-USER MIMO SYSTEMS AND METHODS
A method is provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) system. The MIMO-OFDM system may comprise at least...
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US20090316807 |
METHOD AND APPARATUS FOR ACHIEVING TRANSMIT DIVERSITY AND SPATIAL MULTIPLEXING USING ANTENNA SELECTION BASED ON FEEDBACK INFORMATION
A method of achieving transmit diversity in a wireless communication system is disclosed. The method comprises encoding and modulating data stream based on feedback information, demultiplexing...
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US20090316804 |
METHOD AND APPARATUS TO IMPLEMENT OFDMA RANGING IN WIMAX SYSTEM
A communications processing device includes a rotor for rotating information associated with ranging subchannels in some symbols; and a single inverse fast Fourier transformer (IFFT), coupled to...
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US20090316627 |
Uplink modulation and receiver structures for asymmetric OFDMA systems
The present invention centers upon uplink communication protocols for use primarily with orthogonal frequency division multiple access (OFDMA) communication systems. Aspects of the invention relate...
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US20090316817 |
CHANNEL ESTIMATION FOR WIRELESS SYSTEMS WITHOUT MATRIX INVERSION
In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using...
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US20090316809 |
Method for transmitting channel quality information
There is provided a method for transmitting channel quality information in a wireless communication system. Over-all band of the wireless communication system is divided by a plurality of...
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US20090316820 |
OFDM RECEIVER HAVING MEMORY CAPABLE OF ACTING IN A SINGLE-CHIP MODE AND A DIVERSITY MODE
An OFDM receiver is provided. The OFDM receiver comprises a Fourier transform (FFT) module, a storage device, an equalizer, and a diversity combiner module. The Fourier transform module transforms...
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US20090316814 |
METHOD FOR SIGNALING OF RESOURCE ALLOCATION TO ADJUST GRANULARITY IN CELLULAR MULTI-CARRIER SYSTEM
A method for adjusting a granularity of resource allocation in a wireless mobile communication system supporting a compact scheduling is disclosed. A resource indication value (RIV) corresponds to...
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US20090316805 |
ENERGY-EFFICIENT LINK ADAPTATION AND RESOURCE ALLOCATION FOR WIRELESS OFDMA SYSTEMS
An energy-efficient framework for active transmission in OFDMA-based long-range wireless networks is disclosed. This frame-work is based on using energy-aware metrics for resource allocation and...
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US20090316812 |
OFDM Communication Device and Guard Interval Length Determining Method
An OFDM communication device ( 10 ) includes: an REF/IF/BR unit ( 11 ) for receiving a series of symbols; a frequency fluctuation amount information acquisition unit ( 21 ) for acquiring frequency...
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US20090316810 |
METHODS FOR TRANSMITTING AND RECEIVING A MULTICARRIER SIGNAL COMPRISING ISOLATED PILOTS, CORRESPONDING DEVICES AND COMPUTER PROGRAM PRODUCTS
A method is provided for receiving a received signal corresponding to a multicarrier signal transmitted by at least one transmitter via a transmission channel, the multicarrier signal being formed...
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US20090316808 |
RADIO RECEPTION DEVICE, RADIO TRANSMISSION DEVICE, RADIO BASE STATION, RECEPTION METHOD, AND TRANSMISSION METHOD
An OFDM radio reception device 100 with multiple antennas 110 - 1 to 110 -K removes a guard interval CP from each received signal, and performs S/P conversion, FFT, and channel estimation, on...
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US20090316816 |
METHOD FOR MULTIPLE USE SUBCHANNELS
Systems and methods for multiuse subcarriers in multipoint-to-point communication using orthogonal frequency division multiplexing (OFDM) are provided. In one embodiment, a remote unit for...
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US20090318157 |
RECEPTION DEVICE, TRANSMISSION DEVICE, AND COMMUNICATION METHOD
It is possible to provide a transmission device, a reception device, and a communication method which can improve a throughput in a MIMO system performing a precoding process. Each of beams formed...
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US20090310691 |
METHODS AND SYSTEMS FOR CARRIER FREQUENCY OFFSET ESTIMATION AND CORRECTION OFDM/OFDMA SYSTEMS
Methods and apparatus for determining an accurate fractional carrier frequency offset (CFO) adjustment in an orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division...
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US20090310699 |
COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT
A communication apparatus for transmitting transmission data containing a preamble and a postamble is provided. The communication apparatus includes: a phase vector assigning unit which assigns a...
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US20090310475 |
METHOD FOR SCHEDULING DISTRIBUTED VIRTUAL RESOURCE BLOCKS
A method for efficiently scheduling virtual resource blocks to physical resource blocks is disclosed. In a wireless mobile communication system that supports a resource block group (RBG) allocation...
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US20090310591 |
VoIP multimode WLAN, Wi-Fi, GSM, EDGE, TDMA, spread spectrum, CDMA systems
Voice over Internet Protocol (VoIP) voice signal processed into Orthogonal Frequency Division Multiplexed (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) signal. Processor and...
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US20090310693 |
EFFICIENT CQI SIGNALING IN MULTI-BEAM MIMO SYSTEMS
The present invention relates to the signaling of channel quality information in a multi-beam transmission system, wherein a plurality of beams are simultaneously transmitted and a plurality of...
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US20090310692 |
CHANNEL ACCESS PROTOCOL FOR WIRELESS COMMUNICATION
Method, apparatus, and computer program product embodiments are disclosed to enable an access point in a wireless network to use Orthogonal Frequency-Division Multiple Access (OFDMA) reserve...
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US20090310694 |
APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING MAP INFORMATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM
A broadband wireless communication system and method are provided. The method includes allocating an orthogonal sequence to a MAP that requires ACKnowledge (ACK) transmission, transmitting the MAP...
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US20090310690 |
METHODS AND SYSTEMS OF AGC AND DC CALIBRATION FOR OFDM/OFDMA SYSTEMS
Methods and apparatus for automatic gain control (AGC) and DC calibration for orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) systems are...
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US20090310656 |
COMMUNICATION SYSTEM AND TECHNIQUE USING QR DECOMPOSITION WITH A TRIANGULAR SYSTOLIC ARRAY
An apparatus, system, and method to perform QR decomposition of an input complex matrix are described. The apparatus may include a triangular systolic array to load the input complex matrix and an...
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US20090304098 |
Method of transmitting control signals in wireless communication system
A method of transmitting control signals in a wireless communication system is provided. The method comprises allocating at least one control signal in a control channel region comprising a...
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US20090304101 |
INTELLIGENT POWER SYSTEM AND METHODS FOR ITS APPLICATION
Methods and systems for injecting information into a power signal, and techniques to capture the injected information are disclosed. Various processes for using the information are also presented,...
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US20090304096 |
SYSTEM AND METHOD FOR RANDOMIZED ANTENNA ALLOCATION IN ASYNCHRONOUS MIMO MULTI-HOP NETWORKS
A system and method for simultaneous and asynchronous transmissions in multi-antenna multi-hop networks. The system and method employ randomized and non-greedy resource allocation to counter...
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US20090303867 |
APPARATUS AND METHOD FOR PREVENTING DATA READ ERROR FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYMBOL DEMODULATION
Disclosed are an apparatus and a method for preventing data read error for OFDM symbol demodulation. An average time synchronization offset estimating unit estimates average time synchronization...
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US20090304095 |
WIRELESS COMMUNICATION SYSTEM COMPENSATING FOR INTERFERENCE AND RELATED METHODS
A wireless communication system may include first and second wireless communications devices communicating with one another via a wireless communications link having a settable link characteristic....
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US20090304099 |
DIGITAL SIGNAL TRANSMISSION AND RECEPTION
A digital signal transmitter in which multiple data streams are each transmitted by modulation of a respective frequency band within one of a group of frequency channels, the frequency bands each...
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US20090304094 |
Dual Carrier Modulation Soft Demapper
An Orthogonal Frequency Division Multiplexing (OFDM) communication system with a transmitter and a receiver. The transmitter is arranged to transmit channel estimation sequences on each of a...
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US20090304100 |
INTERFERENCE REDUCTION BETWEEN OFDM CARRIERS BY FREQUENCY OFFSET OPTIMIZATION
Systems and methodologies are described that facilitate signal separation across different carriers within a wireless communications environment. The systems and methods can identify a carrier...
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US20090304097 |
TRANSMITTING APPARATUS AND METHOD USING TONE RESERVATION IN OFDM SYSTEM
The present invention relates to an apparatus and a method for transmitting orthogonal frequency division multiplexing (OFDM) signals using a tone reservation scheme. Preferably, the present...
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US20090303948 |
Communication System, Base Station, and Communication Method
In a communication system of the OFDMA communication method, even when transmission data is decreased temporarily and then increased again while communication by a user terminal is in progress, the...
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US20090303949 |
OFDMA Communication System and Communication Method
There is provided an OFDMA communication system capable of suppressing the communication resource reduction and reducing the processing load on a base station. The system includes a downlink frame...
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US20090304102 |
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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US20090303925 |
Method and Node for Providing a Quality of Service Support in Multihop Communication Systems
A method and apparatus according to the technique wherein support of a quality of service is provided for transmissions between at least one node (N) and at least one mobile station (MS 1 ) in a...
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