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7324432 |
Apparatus of compensating for frequency offset using pilot symbol in an orthogonal frequency division multiplexing system
An apparatus of compensating for a frequency offset using a guard interval and a pilot symbol, which are inserted at a transmitter, in an OFDM (Orthogonal Frequency Division Multiplexing) system....
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7324433 |
Method and apparatus for determining signal quality
The present invention is directed to a method, program product, and apparatus that determines a signal quality associated with a symbol modulated signal based on a scalar relationship based on at...
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7324430 |
Synchronization detection apparatus and method based on orthogonal frequency division multiplexing
An orthogonal frequency division multiplexing (OFDM)-based synchronization detection apparatus including a 2 n level quantizing unit quantizing received data samples into levels of 2 n , where n...
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7324434 |
Radio transmission system and method, and transmitter apparatus and receiver apparatus used in the radio transmission system
A radio transmission system is configured to, on the occasion of radio transmission of information between a transmitter and a receiver, perform the radio transmission of information using an...
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7324495 |
System and method for broadcasting timing information to remote units in a wireless multiple access network
A method has been provided for using the broadcast channel of a wireless multiple access network to communicate network timing information, or a time-stamp, to remote units. The method defines a...
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7324435 |
Methods and apparatus for receiving OFDM signals
A receiver for OFDM signals estimates the carrier frequency offset from a training sequence of symbols in the received signal, by minimising a cost function which is designed to exploit...
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7324431 |
Method and device for allocating a communication signal to multiple carrier frequencies in a multi carrier communication scheme
A method of allocating a communication signal to multiple carrier frequencies in a multi carrier communication scheme is disclosed. The method involves a step of defining a pilot pattern ( 76 ),...
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7321564 |
Hybrid IMMSE-LMMSE receiver processing technique and apparatus for a MIMO WLAN
A Hybrid IMMSE-LMMSE receiver processing technique predicts performance of and selects between iterative and non-iterative decoding of symbols based on an intelligent metric. Based on a...
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7321550 |
Method of equalization in an OFDM system
An equalization method suitable for use in a receiver in an orthogonal frequency division multiplexing (OFDM) system utilizing a plurality of sub-carriers. The receiver includes an outer receiver...
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7319659 |
OFDM receiver, mode detector therefor, and method for processing OFDM signals
A method of mode detection for OFDM signals. The method comprises the steps of delaying the OFDM signal for a first and second number of samples, multiplying the two delayed signals by coefficient...
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7319712 |
Orthogonal code generation apparatus, scrambling code generation apparatus and portable radio terminal using such apparatus
An orthogonal code generation apparatus can generate a sequence of orthogonal codes without having to prestore orthogonal code sequences in a memory, by applying logic operation on a sequence...
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7319658 |
Multirate, constant envelope, constant bandwidth, modulation, channelization, and detection system based on orthogonal bipolar spreading vectors including biorthogonal coding and including error-control
A modulation channelization, demodulation and error-control system based on orthogonal bipolar spreading vectors is provided that permits a variable information rate to be transmitted without...
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7319660 |
Device and method for symbol frame synchronization of OFDM transmitter and receiver
Provided is a frame synchronization pattern design and synchronization method by which in a transmitter of a communications system employing an orthogonal frequency division multiplexing (OFDM), a...
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7319690 |
Communication signal equalization systems and methods
Communication signal equalization methods and systems are disclosed. A CDMA signal having a data portion and a known portion including a known or repeated data sequence and received over a...
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7319685 |
Method for assigning channels based on spatial division multiplexing in an orthogonal frequency division multiplexing system with multiple antennas
A method for assigning a single frequency sub-channel to a plurality of MSs (Mobile Stations) in an OFDM (Orthogonal Frequency Division Multiplexing) system utilizing SDM (Spatial Division...
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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...
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RE39980 |
Calling channel in CDMA communications system
A Code Division Multiple Access (CDMA) communication system which contains a calling channel which is used to inform silent mobiles that they are being called. In the system, the calling channel is...
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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...
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7313115 |
TFO-capable communication apparatus
Apparatus communicating with a mobile and a remote base station. The mobile is assumed to have a coding unit capable of operating in at least one mode selected from a set, each mode in the set...
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7313086 |
OFDM receiver, semiconductor integrated circuit and OFDM method for receiving a signal
An OFDM receiver includes a converter configured to generate a transform signal by Fourier transform of a received signal. A first interpolator is configured to detect a pilot signal from the...
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7313125 |
OFDM demodulation method and semiconductor integrated circuit device
The invention comprises: processing for receiving an OFDM packet having a preamble and the following data transmission symbol, in which packet the subcarrier interval of the preamble is set wider...
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7313085 |
Method for creating symmetric-identical preamble and method for synchronizing symbol and frequency of orthogonal frequency division multiplexed signals by using symmetric-identical preamble
A method for synchronizing symbol timing and frequency of symmetric-identical (SI) Orthogonal Frequency Division Multiplexed signals (OFDM) wherein an SI preamble is used for calculation of the...
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7310305 |
Method for determining reference phase in radio communication system which uses orthogonal M-ary modulation, and coherent detection method using the same
Reference phase is a radio communication system using orthogonal M-ary modulation is determined, so that a coherent detection system for a CDMA radio communication system is readily achieved. The...
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7310304 |
Estimating channel parameters in multi-input, multi-output (MIMO) systems
In a communication system, and in particular a wireless Orthogonal Frequency Division Multiplexing (OFDM) communication system, the present invention provides systems for estimating parameters of a...
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7310378 |
Estimating a transmission channel with pilot symbols distributed in lattice structure
A method for estimating a transmission channel from a multicarrier signal transmitted through said transmission channel, comprising real pilot symbols and so-called pure imaginary pilot symbols,...
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7308020 |
System and method of interference suppression
To perform interference suppression for a received signal more precisely. Block dividing section divides a data part of a received slot into several blocks. Channel estimator calculates a channel...
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7307944 |
Communication terminal apparatus and spreading code estimation method
A despreading and RAKE combining section despreads a data portion using all spreading codes and RAKE combines the despread signal. An average value calculating section calculates RAKE output...
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7305057 |
Multichannel filter-based handheld ultra wideband communications
A multichannel filter-based handheld UWB communication transceiver is presented for outdoor operations. Using eleven multichannels with multicarrier modulations, the invented handheld UWB...
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7304939 |
Communication using simultaneous orthogonal signals
Wireless communication is improved by simultaneously transmitting signals that are orthogonal to received signals. This technique is referred to as Orthogonal Division Duplexing or ODD. Channel...
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7301891 |
Apparatus and method for reducing peak-to-average power ratio in an orthogonal frequency division multiplexing system
A transmitter apparatus and method for reducing PAPR in an OFDM system. The transmitter apparatus performs a masking process on an input signal block using a plurality of mask sequences in an OFDM...
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7298692 |
Radio base station apparatus and communication terminal
MS receives a downlink signal transmitted based on a guard interval determined using a delay profile with high accuracy generated based on a CDMA uplink signal, and performs Fourier Transform...
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7298722 |
Radio transmission apparatus and radio transmission method
When transmission is performed using the OFDM-CDMA method, subcarriers # 1 through #m, # 2 m +1 through # 3 m , #3 m +1 through # 4 m , and # 4 m +1 through # 5 m in which spread signals are...
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7295518 |
Broadband network for coaxial cable using multi-carrier modulation
A broadband local area data network uses coaxial cable wiring for interconnection of terminal devices. Orthogonal frequency division multiplexing (OFDM) with bit loading is used to overcome channel...
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7295509 |
Signaling method in an OFDM multiple access system
A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration...
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7292563 |
Method of associating a training code to a channelisation code in a mobile telecommunication system
A method of associating the Training code to a Channelisation code in a mobile telecommunications system. The method includes associating a Training code with a Channelisation code prior to...
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7289425 |
Parallel orthogonal frequency division multiplexed communication system
A parallel orthogonal frequency division multiplexed (OFDM) communications system includes a transmitter and receiver, the transmitter having a parallel fast Fourier transform (FFT) module...
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7289427 |
Enhanced ARQ with OFDM modulation symbols
A method and apparatus are provided for error correction in a communication system employing Orthogonal Frequency Division Multiplexing. When a remote unit receives an OFDM symbol, a retransmission...
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7289426 |
Method and low consumption device for parallel generating channelization codes for CDMA transmissions, in particular WH and OVSF codes
Described herein is a method for parallel generating Walsh-Hadamard (WH) channelization codes and Orthogonal Variable Spreading Factor (OVSF) channelization codes, which are channelization codes...
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7289475 |
High-speed cell search system for CDMA
In a high-speed search system for CDMA, plural (M) symbols which are subjected to spread frequency coding with a spreading code called as a short code are prepared when synchronization of the...
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7283598 |
OFDM receiver apparatus
An OFDM receiver apparatus comprises a receiver to receive an OFDM signal, an estimator to estimate a distortion, a distortion compensator subjecting the sub-carrier to distortion compensation...
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7283498 |
Method and apparatus for allocating a pilot carrier adaptively in an orthogonal frequency division multiple access system
A method and apparatus for allocating pilot carriers adaptively in an OFDMA communication system are disclosed. To improve phase error estimation performance and optimize the number of pilot...
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7280468 |
Apparatus for constant amplitude coded bi-orthogonal demodulation
A constant amplitude coded bi-orthogonal demodulator demodulates the received constant amplitude bi-orthogonal modulated data, cancels the parity bits to generate the serial data, detects the...
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7280467 |
Pilot transmission schemes for wireless multi-carrier communication systems
Pilot transmission schemes suitable for use in wireless multi-carrier (e.g., OFDM) communication systems. These pilot transmission schemes may utilize frequency, time, or both frequency and time...
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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...
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7280810 |
Multimode communication system
Multimode, multi-function, multiple modulator-demodulator (modem) system containing a fingerprint sensor, detection, identification, authentication, and processing device for one or multiple...
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7280504 |
OFDM transmitting and receiving apparatus
An OFDM transmitting and receiving apparatus where the receiving unit receives an OFDM signal. A computing unit in the receiving unit computes a value of a channel response characteristic of each...
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7280466 |
Transmitter for a wireless communications system using multiple codes and multiple antennas
In a transmitter of a wireless communications system having M transmit antennas ( 10 ), each transmit antenna is supplied with a respective combined signal comprising a respective one of M groups...
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7277512 |
Systems and methods for accounting for intercarrier interference in transmission systems
A device that transmits data using discrete multitone modulation includes a memory that stores intercarrier interference (ICI) information for each of the tones used to transmit data. The device...
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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...
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7277381 |
Method of data transmission by orthogonal frequency-division multiplexing
A method for transmitting data between at least three nodes of an orthogonal frequency-division multiplexing network, including assigning to each node at least one transmit frequency and one...
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