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7623604 |
Suppressing interference for wireless reception and improvements relating to processing a frequency shift keyed signal
A communications receiver may include an adaptive filter unit for removing coherent interference components from a received signal. In the absence of a signal of interest, the filter may adapt...
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7623597 |
Block codeword decoder with confidence indicator
A wireless transceiver ( 100 ) that produces soft decisions for received, block error correction encoded codewords and a confidence indicator signifying a likelihood of errors in the detected data....
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7623570 |
Multi sub-carrier communication system and method providing improved frequency equalization performance
There is provided a multi sub-carrier communication system for providing improved performance of a frequency equalizer and a method thereof. The multi sub-carrier communication system includes a...
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RE41001 |
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...
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RE40978 |
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...
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7616678 |
Multi-carrier constant envelope signal scheme for power and bandwidth efficient communications
A technique for combining a plurality of signals to form a multi-carrier constant-envelope composite signal includes generating a constant-amplitude inphase (I) composite signal based on a majority...
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7609776 |
Quadrature frequency changer, tuner and modulator
A quadrature frequency changer comprising first and second mixers and a local oscillator and a tuner and modulator including the quadrature frequency changer are provided. The local oscillator...
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7609757 |
DSL rate adaptation
A method for enhancing the bit rate and/or margin at which quadrature amplitude modulation (QAM) communication is performed includes the steps of varying a spectral allocation and constellation...
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7599441 |
Low complexity soft-input Viterbi decoding for digital communication systems
A DVB-H bit-interleave coded modulation/demodulation system and method includes a convolutional encoder; an interleaver operatively connected to the convolutional encoder; a quadrature amplitude...
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7599419 |
Method and apparatus for use of space time trellis codes based on channel phase feedback
A method for multiple-input-multiple-output (MIMO) wireless communication comprises the steps of generating inner and outer codes based on channel state information available at a transmitter and...
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7593491 |
Quadrature single-mixer multi-mode radio frequency receiver
The present invention is a quadrature multi-mode RF receiver that uses a single quadrature mixer for tuning to desired frequency bands. In a direct conversion mode of operation, the RF receiver...
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7590186 |
Orthogonal frequency division multiplexing (OFDM) system receiver using low-density parity-check (LDPC) codes
Arrangements relating to an Orthogonal Frequency Division Multiplexing (OFDM) receiver ( 200 ) can include performing at least one Low-Density Parity Check (LDPC) decoding attempt on a received...
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7590182 |
Method and apparatus for utilizing channel state information in a wireless communication system
Techniques for transmitting data from a transmitter unit to a receiver unit in a multiple-input multiple-output (MIMO) communication system. In one method, at the receiver unit, a number of signals...
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7586995 |
Peak windowing for crest factor reduction
In order to reduce the crest factor of a signal for power amplification, a windowing function is applied. The windowing function that is applied is a triangular windowing function. The use of this...
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7583802 |
Method for using a synchronous sampling design in a fixed-rate sampling mode
The present application generally relates to apparatuses such as television signal processing apparatus that process radio frequency signals. More specifically, the present application is...
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7583743 |
Method of differential-phase/absolute-amplitude QAM
A method of quadrature amplitude modulation involving encoding phase differentially and amplitude absolutely, allowing for a high data rate and spectral efficiency in data transmission and other...
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7577219 |
Apparatus for communications
An apparatus for communications includes, a front processor for outputting a digital formatted base band signal with quadrature demodulating a modulated signal; an interpolation processor for...
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7577207 |
Bit labeling for amplitude phase shift constellation used with low density parity check (LDPC) codes
An approach is provided for bit labeling of a signal constellation. A transmitter generates encoded signals using, according to one embodiment, a structured parity check matrix of a Low Density...
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7570711 |
Quadrature LINC transmission method and apparatus
A quadrature LINC transmission system processes a baseband input signal for transmission as a linearly amplified RF signal. An in-phase LINC element processes an in-phase baseband signal into an...
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7570699 |
QAM symbol mapping method and apparatus for downstream transmission of a cable modem
Provided is a QAM (Quadrature Amplitude Modulation) symbol mapping method and apparatus for downstream transmission of a cable modem. The method includes the steps of: determining phase information...
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7570698 |
Multiple output multicarrier transmitter and methods for spatial interleaving a plurality of spatial streams
A multicarrier transmitter performs bit-interleaving suitable for transmitting more than one spatial stream over a multicarrier communication channel. The multicarrier transmitter may include a...
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7570694 |
Backward compatible multi-carrier transmission system
The transmission system is backward compatible with a former transmission system (DVB-T), enabling a receiver of the former system to receive signals transmitted by a transmitter of the new...
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7567501 |
Embedded keying
Method of communicating digital data in which frames ( 8 ) are transmitted cyclically whereby a first number of symbols is transmitted according to a first keying mode (II) using a first...
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7558329 |
Systems and methods for implementing receiver transparent Q-mode
In a receiver transparent Q-mode, i.e., a Q-mode that is only implemented by a transmitter, the receiver is unaware of the Q-mode state of the transmitter. In this type of Q-mode configuration, the...
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7555052 |
Method and system for a turbo trellis coded modulation scheme for communication systems
Method and System for evaluating a turbo-coding scheme suitable for VDSL2 systems. The scheme is a Turbo-Trellis Coded Modulation TTCM that makes use of a Parallel Concatenated Convolutional Code...
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7555051 |
Method and device for estimating IQ imbalance
A quadrature transmitter and receiver have configurable I and Q channel paths that facilitate the application of selected test signals to determine gain and phase imbalances introduced by the...
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RE40779 |
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...
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7548597 |
Cascadable diversity receiving system and method thereof
The invention relates to a receiving system and method, and in particular, to a diversity receiving system and method. A diversity receiving system comprises a plurality of cascading receivers for...
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7545873 |
Radio transmission apparatus, radio reception apparatus and radio transmission method
A radio transmission apparatus capable of enhancing the diversity effect. In this apparatus, phase rotation section (102) performs phase rotation processing of 40.6°=26.6°+14.0°, interleavers (...
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7545731 |
Virtual buffer size management system for the transmission of blocks of data bits in an HS-DSCH downlink channel of a mobile communications network
A first rate matching stage matches a number of input bits coming from a transport channel including a high-speed downlink shared channel (HS-DSCH) of a block of data bits to be transmitted from a...
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7542521 |
Direct-conversion frequency mixer
Provided is a direct-conversion frequency mixer for down converting a radio frequency (RF) signal into a baseband signal, in which a single phase RF signal and a quadrature location oscillation...
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7539273 |
Method for separating interfering signals and computing arrival angles
A method is disclosed for processing all types of received, interfering radio frequency signals corrupted by noise to extract the individual signals without having any a priori knowledge about...
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7539270 |
Method and apparatus to interleave bits across symbols from different constellations
An encoded input bit stream is interleaved across a number of symbols having different bit sizes in a manner that ensures that the bits assigned to each symbol from the bit stream are separated by...
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7539123 |
Subcarrier puncturing in communication systems
A circuit and method provides subcarrier puncturing by placing no information in subcarriers that suffer from channel impairments where they cannot deliver information. If no energy is placed in...
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7539122 |
Device and method for management of the transmission of blocks of data in an HS-DSCH downlink channel of a mobile communications network
A device (D) is dedicated to managing transmission of digital data blocks in High-Speed Downlink Shared Channel (HS-DSCH) downlink transport channel set up between a base station of a...
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7535976 |
Apparatus and method for integration of tuner functions in a digital receiver
A receiver to process a RF input signal having a plurality of channels includes a direct down conversion circuit, a demodulation circuit, and a local oscillator circuit. The direct down conversion...
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7535975 |
QAM mapping and bit labeling or bit-interleaved coded modulation
Methods and systems using a Gray-like labeled QAM cross-constellation are disclosed. In some embodiments a Gray-like labeled QAM cross-constellation is used in wireless communication systems.
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7532563 |
Mechanism to improve quality of channel estimates in OFDM transmissions
An OFDM (Orthogonal Frequency Division Multiplexing) system may utilize pilot symbol structures including two or more pilot symbols with pilot information on alternate tones. The pilot information...
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7526250 |
Apparatus, system and method for flip modulation in an impulse radio communications system
Apparatuses, systems and methods for transmitting and receiving modulated impulse radio signals. An impulse radio receiver includes a time base, a precision timing generator, a template generator,...
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7512186 |
Rate adaptation and parameter optimization for multi-band single carrier transmission
A method for enhancing the bit rate and/or margin at which quadrature amplitude modulation (QAM) communication is performed over multiple bands of a communication link includes the steps of varying...
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7505531 |
Signal communications system and method for noisy links
A system and method for communicating signals over a noisy channel is provided wherein an input signal may be sampled and modulated to make the signal more noise insensitive. In accordance with one...
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7505524 |
Receiver device and communication system
A communication system that sends and receives signals via each of two adjacent channels ch 1 and ch 2 in which interchannel interference exists, wherein the receiver device comprises a soft...
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7505522 |
Spectral shaping in multiband OFDM transmitter with clipping
A method of shaping an orthogonal frequency division multiplexing (OFDM) signal spectrum is disclosed. The method comprises receiving an input signal that has a frequency spectrum that includes a...
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7502423 |
Digital modulator and digital modulation method
Each of a first oversampling filter and a second oversampling filter oversamples to an n×m times as high frequency as a symbol rate. The first and second oversampling filters then output output...
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7492833 |
Method for digital wireless communications
In a multivalue modulation type with one pilot symbol inserted for every 3 or more symbols, signal points of each one symbol immediately before and after a pilot symbol are modulated using a...
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7492832 |
Method and apparatus for digital vector QAM modulator
Direct digital QAM modulation at an RF frequency is obtained from digitally synthesized RF signals which are generated for use as the two vectors. The two vectors are individually controlled in...
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7486608 |
Efficient implementation of low power mode in digital subscriber line (DSL) transceivers
Efficient implementation techniques of a low power mode, (i.e. L2 mode for ADSL2) for DSL transceivers are described. The techniques save memory space and reduce implementation complexity. A...
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7483491 |
Linear transformation circuits
A transform circuit includes a first circuit and a second circuit. The first circuit and the second circuit implement first and second mappings that together generate a pre-defined transform of N...
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7480338 |
Constellation mapping apparatus and method
A constellation mapping apparatus, which can reduce the storage capacity of a memory to one fourth by only storing constellation points in one quadrant of each constellation map rather than storing...
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7477708 |
Modes of operations in QAM modems
The method of selecting an optimum mode of operation of the QAM modem comprising (A) using a host interface to select a pair of states, the first state being an initial state; the second state...
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