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7412209 Shifted channel characteristics for mitigating co-channel interference  
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises shifting a characteristic of the...
7409013 Super-orthogonal space-time trellis codes, and applications thereof  
A super set of orthogonal space-time block codes is combined with set partitioning to form super-orthogonal space-time trellis codes having full diversity, enhanced coding gains, and improved...
7409003 Method and apparatus for implementing adaptive tomlinson-harashima precoding in a digital data link  
The invention relates to a method for implementing adaptive Tomlinson-Harashima precoding using a digital data communications link. According to the method, the outgoing bit stream is coded into...
7406132 Pre-equalizer, VSB transmission system using the same, and transmission method thereof  
Disclosed is a pre-equalizer, a vestigial sideband (VSB) transmission system using the pre-equalizer, and a VSB transmission method. A first transmit signal is stored in a first memory, and a...
7394880 Method and apparatus for simulating radio channel  
A radio channel simulator configured to read radio channel data describing a radio channel and user data including at least one user signal, and to simulate the radio channel using a FIR filter...
7392450 Method and apparatus of compensating for signal receiving error at receiver in packet-based communication system  
A method and an apparatus of compensating for a signal receiving error at a receiver in a packet-based communication system. In the invention, frequency offset estimation and DC offset estimation...
7391826 Decoding method and apparatus  
A method of decoding is provided comprising processing iterations. In each processing iteration, there is a first Max-Log-MAP decoding operation giving rise to a systematic error due to the Max-Log...
7388936 Digital data receiver for edge cellular standard with DC offset correction, channel impulse response estimation, I/Q phase imbalance compensation, interference estimation, and selective equalization  
A receiver unit includes a prefilter that receives as one of the inputs a channel impulse response (CIR) estimation data set and removes unnecessary data information from the CIR estimation data...
7388935 Method of inverting nearly Toeplitz or block Toeplitz matrices  
A method of computing an inversion (X) of a nearly Toeplitz n by n matrix (A). A perturbation matrix (E) is first determined such that the sum of the nearly Toeplitz matrix (A) and the perturbation...
7388926 Quadrature modulation system  
A disclosed quadrature modulation system inputs an inphase signal component and an orthogonal signal component, and outputs an output signal that is quadrature modulated by a quadrature modulator....
7386060 Method of reducing a peak-to-average power ratio  
The present invention relates to a method of reducing a peak-to-average power ratio of a signal to be transmitted. The method comprises the steps of detecting a portion of the signal being above a...
7385934 Radio communication apparatus and transfer rate decision method  
A transmission rate determining method that enables assignment of transmission rate (modulation scheme and coding rate) to be optimized with high accuracy in the AMC technique. In the method, in a...
7382833 System for phase, gain, and DC offset error correction for a quadrature modulator  
A quadrature modulator compensation system for compensating the transmission of a source signal includes a transmitter which uses a transmitter input signal to generate a transmitter output....
7379493 Signal analyzer for detecting distortions in signals  
A signal analyzer system comprises a differential operator configured to receive at least one input signal, and to determine at least one locus based on instantaneous differences in a relative rate...
7376197 Signal peak reduction circuit for non-constant envelope modulation signals  
Circuits for reducing the signal peaks in telecommunications signals are described. The circuits and methods are preferably adapted for reducing the peak to average power ratio of non-constant...
7373132 High frequency signal receiver  
A high frequency signal receiver can prevent higher harmonics other than a necessary higher harmonic from being subjected to frequency conversion so as to interfere with the base band signal in a...
7366230 Power control in mobile radio communications systems  
A power control unit ( 500 ) for a power control system in a mobile communication system, the power control unit ( 500 ) comprising an inner power control loop element ( 503, 507 ), which generates...
7363019 Shaping the drive signal of a mixing device  
Techniques for shaping the drive signal of a mixing device to overcome a characteristic capacitance of the control terminal of the mixing device and reduce the time the mixing device is in an...
7362841 Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable DC termination impedance  
A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines....
7362821 Method and apparatus for amplifier linearization using adaptive predistortion  
A distortion correction circuit comprises memory that stores N samples of an input signal that occur at N different times, where N is an integer greater than two. A self-receiver samples an output...
7362817 UWB (Ultra Wide Band) interference mitigation  
UWB (Ultra Wide Band) interference mitigation. A novel solution is presented whereby various piconet operable devices are operated to support a relatively structured interference pattern. The...
7362816 Inversion of channel distortion by adaptive wavelet lifting  
A method for inverting telecommunication channel distortion by adaptive wavelet lifting. The distortion signal is analyzed using wavelet lifting and the inverse filter is computed. Coefficients of...
7362803 Method and system for interactive channel equalization  
A method and system for interactive channel equalization uses channel status information included in data packets. The system includes a first station adapted to transmit a first data packet...
7359424 Spread spectrum communication system and method therefor  
A spread spectrum communication system and a method can provide resistance against selective fading and can prevent lowering of circuit use ratio with lowering reception bit error ratio. The spread...
7349482 Echo canceller of ADSL system and training method thereof  
An echo cancellation circuit includes delay units at its input unit and output unit in order to adjust the delay caused by a FIFO. The delay times of the delay units are trained using a training...
7346122 Direct modulation of a power amplifier with adaptive digital predistortion  
Techniques for direct modulation of a switching-mode power amplifier with adaptive digital predistortion are disclosed. A baseband digital modulated signal is decomposed into an amplitude signal...
7346041 Processing of an OFDM signal  
The invention relates to an OFDM-transmitter, comprising means for transforming ( 400 ) data to be transmitted in frequency-to-time transformation to a basic waveform containing waveform components...
7342976 Predistortion circuit and method for compensating A/D and other distortion in a digital RF communications transmitter  
A digital communications transmitter ( 100 ) includes a digital linear-and-nonlinear predistortion section ( 200, 1800 ) to compensate for linear and nonlinear distortion introduced by...
7342974 Channel estimation in OFDM systems  
A method for estimating channels of an OFDM signal. The method comprises the steps of deriving responses of pilot channels, deriving responses of first data channels by time and frequency domain...
7339994 Method and apparatus for fast convergent power control in a spread spectrum communication system  
A system and method for adjusting the power control target for a spread-spectrum communication system is disclosed. A preferred embodiment comprises correcting the power control target based upon...
7333560 Method and apparatus for transmitting data in a time division duplexed (TDD) communication system  
Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on...
7333552 Method for coding and decoding an information symbol  
A method and a device for the coding and/or decoding of an information symbol for transmission over a transmission channel or a received signal value is described and illustrated, whereby a channel...
7330523 Estimating frequency offset  
Frequency offset estimation apparatus for estimating the offset from a predetermined centre frequency of an input signal carrying a plurality of frequency shifted symbols, the apparatus comprising:...
7330518 Distortion compensation circuit, and a transmission apparatus including the same  
Predistortion effective for a power amplifier with the memory effect is provided. An A/D converter digitizes a signal voltage value after quadrature modulation, and the result is supplied to a...
7330514 Methods and apparatus to mitigate cross-talk interference  
A circuit board includes a pair of interconnects configured to support conveyance of a differential mode communication signal, which comprises a balanced first signal (e.g., signal X) and...
7327802 Method and apparatus for canceling the transmitted signal in a homodyne duplex transceiver  
An apparatus comprises a transmitter, a receiver, an antenna and a signal cancellation circuit. The transmitter is configured to send a transmitter signal associated with a frequency. The receiver...
7317764 Method of signal transmission to multiple users from a multi-element array  
A communication method is provided, in which a data vector u which contains respective signal data destined for each of a plurality of users is transmitted from multiple antennas or other...
7315592 Common mode noise cancellation  
A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel...
7313199 Power amplifier linearization  
A system for linearizing the output of a high power amplifier (HPA) designed to transmit an RF modulated signal includes in its transmit section a digital up-converter for processing baseband input...
7313191 Receiver device of communication system  
Two correlation signals which are obtained by computing correlations between two reference signals and a reception signal are inputted to a level- 0 cell, the reference signals being generated on...
7313170 Spread spectrum receiver  
A signal generation/noise extraction unit that includes an analog-to-digital converter, a switch, a filter, a subtracter, an oscillator, a multiplier, and a switch generates a down-sampled signal...
7308041 Method and transmitter for transmitting radio signals  
A method of transmitting wireless signals and a transmitter for transmitting wireless signals for optimally operate an amplifier of a transmitter in its linear range, signals being transmitted in...
7308022 Parameter estimator configured to distinguish between peaks and sidelobes of correlation function  
A parameter estimator for estimating one or more parameter(s) from a signal is described. A correlation function is derived from the signal, and the correlation function analyzed to determine if...
7305046 I/Q modulator with carrier predistortion  
An I/Q modulator used for processing an I/Q signal to obtain a predistorted output signal. The I/Q signal has an I component and a Q component, and comprises a predistorter for predistorting, with...
7305037 Calibration system for a communications system  
A calibration system for a communication system is provided featuring a transmitter circuit, a receiver circuit, a transmission medium having a transfer function for transmitting a signal between...
7305029 Multi-pair gigabit ethernet transceiver  
Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is...
RE39928 Communication system  
At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and...
7298803 Methods and apparatuses for filtering common mode interference  
In one embodiment, a method that includes detecting a level on each of a plurality of data channels; summing the levels of a subset of data channels to get a summed level, the subset of data...
7298787 System, and associated method, for facilitating broadband multi-carrier transmission  
A method for facilitating broadband multi-carrier wireless transmission, whereby a plurality of transmit antennas are divided into two or more transmit antenna groups of transmit antennas so that...
7298396 Apparatus and method for monitoring transmission systems using embedded test signals  
A monitoring system for an RF transmission system, such as a multi-channel television broadcasting antenna feed system, gathers data about the physical and electrical condition of the RF...
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