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6920184 |
Transmission system
The transmission system according to the invention comprises a transmitter ( 10 ) and a receiver ( 1 2 ). The transmitter ( 10 ) can transmit datawords via a multicarrier signal ( 11 ) to the...
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6914876 |
Method for dynamic frequency selection
A communication band is divided into a plurality of allocation channels ( 202, 204, 206, 208 ). At least one allocation channel ( 204 ) is transferred to a transform domain. The behavior of the at...
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6912194 |
Digital communication transmission techniques
A multi-point communications system is set forth herein. The communications system includes a receiver and transmitter disposed at a primary site for communication with a plurality of remote...
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6912195 |
Frequency-domain MIMO processing method and system
A communication system based upon frequency-domain MIMO processing is disclosed. A transmitting device of the communication system transforms time-domain signals into frequency-domain signals, and...
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6907026 |
Receiving apparatus for signal transmission system of orthogonal frequency division multiplexing type
A signal transmission system of an OFDM using a plurality of carriers to transmit signal comprises a transmitting apparatus and a receiving apparatus. The receiving apparatus comprises an input...
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6894996 |
Apparatus and method for searching a base station in an asynchronous mobile communications system
Disclosed is an apparatus and method for searching a base station in a mobile communications system, in which a mobile station acquires slot timing synchronization from a first signal on a primary...
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6888790 |
Frame synchronization technique for OFDM based modulation scheme
The present invention relates to the field of communications. The method includes generating a sequence of symbols, the sequence of symbols including preamble symbols and a data symbol. The method...
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6885708 |
Training prefix modulation method and receiver
A receiver for implementing a training prefix modulation method in response to a reception of a signal propagating through a channel is disclosed. The signal as received includes training blocks...
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6885679 |
System and method for layer 2 frame delineation recovery
Methods, receivers and transmitters all adapted to assist in the performance of layer 2 frame delineation are provided which are applicable in the context of OFDM, and also applicable to any layer...
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6876623 |
Tuning scheme for code division multiplex broadcasting system
A CDM satellite transmission system is disclosed that broadcasts programming content, such as audio and video information, using one or more geo-synchronous satellites based on Code Division...
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6876675 |
Synchronization in OFDM systems
Highly effective systems and methods for synchronizing OFDM receiver parameters to an OFDM transmitter are provided. These parameters may include carrier frequency, burst timing, and cyclic prefix...
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6868077 |
Device enabling different spreading factors while preserving a common rambling code, in particular for transmission in a code division multiple access cellular mobile radio system
A device which enables different spreading factors while preserving a comnmon scrambling code, in particular for transmission in a code division multiple access cellular mobile radio system. The...
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6862271 |
Multiple-input, multiple-output (MIMO) systems with multiple transmission modes
Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These...
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6862261 |
Zipper type VDSL system
Disclosed is a zipper type Very high bit-rate Digital Subscriber Line (VDSL) system which comprises a transmitter including an inverse fast Fourier transformer for performing an inverse fast...
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6862297 |
Wide range frequency offset estimation in OFDM systems
Systems and methods for wide offset frequency synchronization in OFDM communications. Frequency domain OFDM bursts include training symbols having known transmitted values in known frequency domain...
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6862262 |
OFDM communication device and detecting method
Residual phase error compensation circuit 104 performs differential detection between pilot symbols included in an OFDM signal to compensate for residual phase errors of the OFDM signal and then...
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6856590 |
OFDM transmission device and OFDM transmission method
The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information...
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6856945 |
Method and apparatus for implementing projections in singal processing applications
A novel method and apparatus is provided for enabling the computation of a signal in a certain subspace, its projection that lies outside the subspace, and the orthogonal basis for a given matrix....
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6853678 |
Synchronizing circuit
A synchronizing circuit synchronizes a predetermined code with first and second codes different in phase, include: a code generating part outputting phase-shifted code shifted in phase by a...
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6850481 |
Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system
The distortion in the sub-carrier signals is determined by transmitting known values that are incorporated into the preamble portion of the frame and/or are incorporated into pilot symbols that are...
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6842421 |
Method and apparatus for post-detection maximum ratio combining with antenna diversity in an orthogonal frequency division multiplexing (OFDM) communication system
A novel antenna diversity technique for OFDM receivers is disclosed. A method and apparatus are disclosed for combining in the frequency domain the various signals received on each of the multiple...
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6836484 |
Wireless packet communication method and system for transmitting packets between base station and radio terminal station
A wireless packet communication system includes at least one radio terminal station, and a base station for multiplexing packets to be transmitted using a plurality of subcarriers and for sending...
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6822953 |
Method for transmitting radio signals and receiver for receiving radio signals
A method for transmitting radio signals and a receiver for receiving radio signals are described which are used to present a radio station which is transmitted on multiple frequencies with the data...
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6816452 |
Vehicle-to-roadside communication system, roadside communication station, and on-board mobile station
The present invention realizes a communication system between a road and a vehicle which performs communication between a road communication station and a vehicle-mounted mobile station in a cell,...
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6813258 |
Detection method and device
A detection method in which a CDMA-coded data signal is transmitted in the form of a data stream of spread data bursts between a transmitter and a receiver, hierarchical CDMA codes being used for...
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6810007 |
OFDM transmission/receiving system and block encoding method therefor
An orthogonal frequency division multiplexing (OFDM) transmission/receiving system, and a block encoding method therefor, are provided. The OFDM transmission system includes a block encoder for...
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6807147 |
Methods and apparatus for use in obtaining frame synchronization in an OFDM communication system
An orthogonal frequency division multiplexing (OFDM) communication system includes base units which simultaneously transmit pilot tones in a predetermined pilot tone pattern during one or more time...
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6807146 |
Protocols for scalable communication system using overland signals and multi-carrier frequency communication
A communication system such as an OFDM or DMT system has nodes which are allowed to transmit continuously on one or just a few of the system's frequency sub-channels, while the other nodes avoid...
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6804191 |
Phase sequences for timing and access signals
Methods and apparatus for splitting Golay sequences into a plurality of subsets of sequence elements and transmitting the subsets are described. The sequence subsets include an equal number of...
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6801586 |
OFDM communication apparatus and propagation path estimation method
An OFDM communication apparatus may include a receiver that receives an OFDM signal in which a known signal and an information signal, following the known signal, are superimposed upon a plurality...
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6801495 |
High capacity robust modem for multiple classes of services
A low-cost data communication system and method using modems to provide high speed multi-class services to subscribers is disclosed. In the present invention, an n-bit orthogonal modulating code is...
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6795424 |
Method and apparatus for interference suppression in orthogonal frequency division multiplexed (OFDM) wireless communication systems
A method and apparatus for interference suppression in wireless communication systems, especially Orthogonal Frequency Division Multiplexed (OFDM) systems. The array apparatus includes a two-tier...
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6782041 |
Radio receiver and method for identifying spreading codes
A grouping setting section 206 controls spreading code generation sections 207 to input a plurality of long codes into an adder 208 one by one, and thereby the plural long codes are grouped....
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6775331 |
Transmission band limiting filter apparatus and transmission apparatus
A transmission system is featured by that a correcting unit is arranged at a prestage of an ROF unit in the CDMA system. In this transmission system, an instantaneous power amount is calculated,...
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6771591 |
Method and system for processing orthogonal frequency division multiplexed signals
An Orthogonal Frequency Division Multiplexing (OFDM) receiver that compensates for FFT window drift by extracting a training symbol from a fast Fourier transformed OFDM signal, and processing the...
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6771590 |
Communication system clock synchronization techniques
A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a...
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6768714 |
Methods and apparatus for use in obtaining frequency synchronization in an OFDM communication system
A frequency correction process involves the steps of generating a plurality of tone values for a plurality of tone bins, where the plurality of tone bins includes a first set of tone bins assigned...
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6757344 |
Apparatus and method for measuring sub-carrier frequencies and sub-carrier frequency offsets
Systems and methods are provided for identifying frequency offsets which may for example have been introduced after a signal has been transmitted over a wireless channel. The method involves...
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6757241 |
System for interference cancellation
A spatial processor that exploits signals that arrive via multiple outputs of a communication channel to provide soft decision values useful to a trellis or Viterbi decoder. A spatial processor may...
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6754170 |
Timing synchronization in OFDM communications receivers
An orthogonal frequency division multiplexing (OFDM) receiver is synchronized to a received signal during one of the short symbols of the preamble of the OFDM signal, using a timing synchronizing...
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6748234 |
Method and apparatus for power control in a wireless communication system
In a wireless communication system having a composite transport channel made up of individual transport channels, a method for closed loop power control wherein multiple instances of the outer loop...
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6735221 |
Communication network system
A digital communications network system for multiple access has a head-end node and at least one station node at at least one other end node; the system comprises a head-end controller ( 3 )...
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6735167 |
Orthogonal transform processor
An orthogonal transform processor which can be implemented in simple hardware. A data reception unit accepts a pair of source data values at intervals of T. For each given pair of source data...
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6731594 |
Transmission system for OFDM-signals with optimized synchronisation
The present invention relates to a transmission apparatus for transmitting OFDM-signals comprising modulation means 4 for modulating said signals onto a plurality of subcarriers using a...
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6728202 |
Code division multiplex satellite broadcasting system
A CDM satellite transmission system that broadcasts programming content, such as audio or video information, using two geo-synchronous satellites and a plurality of terrestrial repeaters based on...
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6728295 |
Code division multiple access communication system using overlapping spread sequences
This invention discloses a code division multiple access communications system based on spread sequences designed by using complete factorization of polyphase matrix of a perfect reconstruction...
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6714511 |
OFDM transmission/reception apparatus having a guard interval length changing function
The subtractor of the reception system calculates the channel quality using an optimal guard interval length detection signal inserted into one carrier by the transmission system, then the optimal...
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6711124 |
Time interval based channel estimation with transmit diversity
A wireless communication system with transmit diversity scales a training sequence simultaneously transmitted by two or more antennas over two or more time intervals in a manner that allows a...
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6711120 |
Orthogonal frequency division multiplexing based spread spectrum multiple access
An orthogonal frequency division multiplexing (OFDM) based spread spectrum multiple access system using offsetting between cells, and in particular, the use of tone offsetting and time offsetting,...
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6711123 |
Receiving apparatus for OFDM communication system
In a receiving apparatus, which receiving apparatus performs timing synchronization in OFDM transmission by using specific known patterns included in a reception signal, a correlation value...
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