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7463576 |
Channel estimation for OFDM communication systems
Techniques to estimate the frequency response of a wireless channel in an OFDM system. In one method, an initial estimate of the frequency response of the wireless channel is obtained for a first...
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7463697 |
Multicarrier transmitter and methods for generating multicarrier communication signals with power amplifier predistortion and linearization
A multicarrier signal is generated by pre-compensating frequency-domain subcarrier symbols for substantially linear distortion subsequently introduced by a time-domain baseband filter.
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7460611 |
Communication system, transmitting apparatus and transmitting method, receiving apparatus and receiving method, unbalance code mixing method and multiple code decoding method
A transmitting station side transmits a transmitting signal obtained by a process of segmenting transmission information into a plurality of frames, of encoding each frame, of power amplifying each...
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7460833 |
Transmitting apparatus of communication system
A transmitting apparatus according to the present invention includes a prefilter for compensating a previously measured estimated impulse response of a communication system by assuming a...
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7460587 |
Electronic circuit for performing fractional time domain interpolation and related devices and methods
A clock offset compensation arrangement may include a fractional interpolator for applying a trigonometric interpolation to a sampled input signal according to a clock offset signal. It uses...
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7460615 |
Spatial and time multiplexing of multi-band signals
A multi-band receiver for use with satellite ranging systems is provided. The receiver has a simplified architecture in which input signals of various frequencies are multiplexed together to form a...
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7460621 |
Detection
In a method and apparatus for detecting a message in a signal the message begins with a preamble consisting of a fixed sequence of symbols, each having a symbol time T, modulated by repetitions of...
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7460876 |
System and method for intelligent transmitted power control scheme
Briefly, an adaptive transmitted power control scheme, which may be used in stations of a communication system, for example, a wireless communication system. The scheme may allocate transmission...
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7457369 |
Scalable gain training generator, method of gain training and MIMO communication system employing the generator and method
The present invention provides a gain training generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas where N is at least two. In one embodiment,...
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7457370 |
Frequency staggered frequency shift keying modulation
A frequency modulation method is proposed that enables an imprinting of a digital message formed by a sequence of symbols on a set of frequency bands. Each symbol of the digital message is hereby...
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7457366 |
System and method for adaptive phase compensation of OFDM signals
An OFDM receiver applies phase compensation to subcarriers of data symbols of an OFDM packet. A phase compensation estimate is generated from pilot subcarriers within the data symbol and applied to...
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7453945 |
Methods and devices for controlling RF, multi-carrier amplifier signal power
The input (and output) power of a multi-carrier amplifier can be controlled to allow the amplifier to operate at high RF power levels and still remain within a power rating profile. The amplifier...
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7453957 |
Method and apparatus for transmitting high speed data by spectral decomposition of the signaling space
A method and apparatus of high speed multi-dimensional signaling via a modem has a processing method of utilizing prolate pulses to optimize the transmission capacity of the channel. The modem...
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7453855 |
Multiuser detection and interference suppression techniques for direct sequence spread spectrum systems in which all users employ same spreading code
The present invention considers a direct sequence spread spectrum system wherein every user employs the same spreading code. In a preferred embodiment, received signal is correlated with the...
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7453930 |
Method and system of tone ordering for discrete multi-tone systems with tone grouping
The present disclosure describes a method and system of tone ordering for discrete multi-tone (DMT) systems with tone grouping. Some illustrative embodiments may include a method, comprising,...
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7453895 |
Outlet with analog signal adapter, a method for use thereof and a network using said outlet
An outlet ( 70, 75, 76, 78, 79 ) for a Local Area Network (LAN), containing an integrated adapter ( 21, 25 ) that converts digital data to and from analog video signal. Such an outlet allows using...
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7450653 |
Digital broadcast signal receiving apparatus and method
A signal receiving apparatus and method which is high in deduction accuracy of transfer characteristic and less in error rate during signal decoding. For each detection signal of a pilot carrier...
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7450490 |
Channel estimation using the guard interval of a multicarrier signal
A method of communication using Orthogonal Frequency Division Multiplexing (“OFDM”) comprises generating bit streams (b n ε(0,1),n=0,1, . . . ,K−1) and the corresponding sets of frequency...
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7450651 |
Multi-carrier transmission system
Multi-carrier transmission system comprises transmitter including acquisition unit configured to acquire 2 m (m: a natural number) modulated signals including no-information signals which are...
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7450654 |
Method and apparatus for multicarrier channel estimation and synchronization using pilot sequences
Method and apparatus for OFDM synchronization and channel estimation. In a temporal embodiment, received embedded system pilot symbols are inverse Fourier transformed at expected index locations...
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7450535 |
Pulsed signaling multiplexer
In one embodiment, a pulsed signaling multiplexer is described that comprises a first AC-coupled transmitter and a second AC-coupled transmitter. The first AC-coupled transmitter includes a first...
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7450543 |
Methods and apparatus for wireless network connectivity
Methods and apparatus which allow a wireless terminal ( 302 ) to simultaneously maintain connections with multiple base stations ( 304, 306 ) are described. Each wireless terminal ( 302 ) is...
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7450533 |
Wireless transmitting device and wireless receiving device
A wireless transmitting device includes a first and a second antennas, a first and a second transmitters connected to the first and the second antenna, respectively, signal provide unit provide a...
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7450629 |
Adjustable dual-band link
A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a...
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7450652 |
Apparatus and method for receiving signals in an OFDM communication system
A receiving apparatus in an OFDM communication system, in which the receiving apparatus includes a serial-to-parallel converter that converts a serial signal received through an antenna to parallel...
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7447268 |
OFDM system with per subcarrier phase rotation
Subcarrier phase rotation is implemented in an OFDM transmitting apparatus to overcome problems such as, for example, non-frequency selective multipath fading. In at least one embodiment,...
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7447282 |
System and method for pre-FFT OFDM fine synchronization
A synchronization unit for performing timing synchronization in the time domain includes storage, a multiplier, a signal analyzer, and a timing error estimation unit. The storage stores a reference...
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7447269 |
Method and adaptive modulation in multi-carrier communication
In a radio-communication system and a radio station, one or more subcarriers are grouped, and the maximum bit number per symbol of the modulation method used for each subcarrier is determined for...
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7443782 |
Adaptive inter-carrier interference self-cancellation method and transceiver thereof
The present invention discloses an adaptive ICI self-cancellation method, which can adapt to the dynamical change of frequency offset and signal-noise power ratio (SNR), and a device thereof. The...
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7443917 |
Method and system for transmission of information data over a communication line
A transceiver system and method comprises a transmitter and a receiver. The transmitter includes a synthesis filter bank and an overlapping unit. The synthesis filter bank generates and modulates a...
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7443916 |
Method and apparatus for communication in the presence of impulse noise
A method, system and apparatus for reliable multicarrier communication in the presence of periodic impulsive interference is disclosed. A power level of noise in a signal is determined. An impulse...
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7443921 |
Mobile body communication apparatus
When communications of the same data are performed using a multi-carrier modulation method between a plurality of base stations and a mobile station at the same time and with the same frequency, a...
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7443341 |
Method for deriving weight vectors to be used at the time of transmitting signals from a plurality of antennas, and transmitting apparatus and communication system utilizing said method
A plurality of antennas transmit multicarrier signals composed of a plurality of streams. An IF unit acquires, per carrier, a channel matrix having elements the number of which is determined by the...
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7443783 |
I/Q mismatch compensation in an OFDM receiver in presence of frequency offset
A receiver for an orthogonal frequency division multiplex radio signal in which a carrier frequency is modulated by sub-carrier signals (S 1 ) coded with data. Analogue signal processing means ( 3 ...
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7440507 |
Turbo channel estimation for OFDM systems
A system and method for estimating a channel in a wireless receiver is disclosed. The method preferably applies to a communication system using the OFDM standard. The method comprises receiving a...
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7440508 |
System and method for cellular communications
A a system for allocating subcarriers to subscribers, comprising a subcarriers allocation controller, connected to a subcarrier modulation unit in a transmitter and to a subcarrier demodulation...
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7440506 |
Receiver for recovering data from an OFDM symbol
A receiver for recovering data from a received symbol of signal samples generated in accordance with Orthogonal Frequency Division Multiplexing (OFDM), the OFDM symbol including pilot carrier...
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7440523 |
Apparatus and method for decode arbitration in a multi-stream multimedia system
An apparatus and method are described for mapping a plurality of multimedia streams (e.g., received from a set of satellite transponders) across a lesser plurality of decoders. In one embodiment,...
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7440509 |
Method and system for interference averaging in a wireless communication system
A family of methods for interference averaging in multicarrier systems, such as orthogonal frequency division multiplexing (OFDM) systems. The methods can provide interference averaging in...
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7436893 |
Multiuser allocation method for maximizing transmission capacity
Disclosed is a method and computer-readable medium for bit and power allocation for modems sharing a common multi-carrier binder, including Discrete Multi-Tone (DMT) based Digital Subscriber Line...
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7432838 |
Method and apparatus for reduced power consumption ADC conversion
A method for conversion of signals between analog and digital characterised by; applying a non-linear transfer function to an input signal, such that the relation between the quantisation levels of...
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7433413 |
Data transmission apparatus and method in an OFDM communication system
An apparatus and method for transmitting data on a plurality of frequency sub-channels for a plurality of successive symbol periods through a plurality of transmit antennas in an OFDM system. In...
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7433414 |
Intelligent array radio architecture
A receiver sets weights for an antenna array according to a series of algorithms including an energy algorithm, a least squares algorithm and a least mean square algorithm.
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7433392 |
Wireless communications device performing block equalization based upon prior, current and/or future autocorrelation matrix estimates and related methods
A wireless communications device may include a wireless receiver for receiving signals comprising alternating known and unknown symbol portions, and a demodulator connected thereto. The demodulator...
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7430254 |
Matched detector/channelizer with adaptive threshold
A method of detecting a signal in an input channel of a receiver includes applying each of a plurality of pre-detection bandwidths to an input signal. The method can include deriving, in a cascaded...
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7430163 |
Data stream transmission preprocessing
Embodiments of transmission data stream pre-processing are disclosed. A method includes receiving the data stream for transmission, forming blocks of samples from the data stream, inverse Fourier...
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7430242 |
Spectrally constrained impulse shortening filter for a discrete multi-tone receiver
A channel in a multiple carrier communication system is equalized by computing a target spectral response, shortening the impulse response of the channel so that a significant part of an energy of...
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7428267 |
Uplink channel estimation system for orthogonal frequency division multiple access system and method thereof
In the uplink of an OFDMA system, a preamble is used to estimate a channel and then the pilot tones of a data symbol are used for channel estimation to update the channel estimate. The channel...
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7426240 |
Data processing apparatus and method operable to map and de-map symbols and carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol
A data processing apparatus maps input symbols to be communicated onto a predetermined number of carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor...
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7426204 |
Symbol synchronization method for OFDM-based wireless communication system
Disclosed is a symbol synchronization method in an OFDM-based communication system which includes multiple access nodes supporting wireless connection of terminals, supports multi-connection of...
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