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7570697 |
Advanced MIMO interleaving
A MIMO transmitter including an interleaving system for parsing encoded bits to a plurality of spatial streams and a plurality of interleavers to interleave bits for spatial streams such that at...
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7564915 |
Apparatus and method for coding/decoding pseudo orthogonal space-time block code in a mobile communication system using multiple input multiple output scheme
An apparatus for coding a pseudo orthogonal space-time block code in a transmitter using 4 transmission antennas of first to fourth transmission antennas. Upon receiving information symbol streams...
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7564908 |
Method and apparatus for encryption of over-the-air communications in a wireless communication system
A communication device converts a bit stream to multiple symbols and provides encryption at a physical layer by shifting a phase of each symbol of the multiple symbols to produce multiple encrypted...
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7562280 |
Code design and implementation improvements for low density parity check codes for wireless routers using 802.11N protocol
Method and apparatus for implementing LDPC codes in an IEEE 802.11 standard system configured to operate in a Multiple-Input, Multiple-Output (MIMO) schema. A method in accordance with the present...
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7529312 |
Layered modulation for terrestrial ATSC applications
Systems and methods are disclosed for applying layered modulation to an 8-VSB signal as used in the Advanced Television Systems Committee (ATSC) digital television signal. A system for transmitting...
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7512188 |
Phase shift keying signaling for integrated circuits
The present invention relates to a system for communicating between two integrated circuits (ICs) or within an IC. The ICs are either on the same circuit boards or on different circuit boards with...
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7469491 |
Transmitter predistortion circuit and method therefor
A digital communications transmitter ( 100 ) includes a digital linear-and-nonlinear predistortion section ( 200, 1800, 2800 ) to compensate for linear and nonlinear distortion introduced by...
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7450715 |
Transceiver for bidirectional frequency division multiplexed transmission
The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the...
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7443920 |
Frame-based carrier frequency and phase recovery system and method
Header information is used to facilitate coarse frequency and frame recovery. The coarse frequency and frame recovery is thereafter utilized to perform adaptive phase and frequency synchronization...
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7434136 |
Method of and apparatus for reading recording medium, harddisk controller
An ECC determining unit determines whether an error detected by using an ECC has been corrected. When the detected error has not been corrected, an equalizer output sequence transfer unit transfers...
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7433428 |
Method of reducing the variance of the signal-to-noise rate estimated for a signal with amplitude differential phase-shift keying modulation
This method reduces the variance of the estimation of the signal-to-noise rate in a multiuser digital communications system. These communications require a sending of a phase reference symbol prior...
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7409002 |
Signal modulation
According to an embodiment of the invention, a method and apparatus for signal modulation are described. According to an embodiment of the invention, a method comprises producing and transferring a...
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7382717 |
Method for generating better than root raised cosine orthogonal frequency division multiplexing (BTRRC OFDM)
An improved multicarrier modulation system and method is introduced which has the advantages of both isotropic orthogonal transfer algorithm orthogonal frequency division multiplexing (IOTA OFDM)...
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7349488 |
Frequency shift keying signaling for integrated circuits
The present invention relates to a system for communicating between two integrated circuits (ICs) or within an IC. The ICs are either on the same circuit boards or on different circuit boards with...
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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...
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7269233 |
Algorithm of bit synchronization for a digital FSK correlation receiver
An algorithm for bit synchronization in a frequency shift keying (FSK) receiver. In the algorithm, a training sequence is received from a transmitter. The training sequence has a plurality of bits....
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7260159 |
Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying (QPSK) or offset quaternary phase shift keying (OQPSK)
A method and apparatus for providing an asymmetrical backwards compatible communications signal that is capable of being decoded by QPSK and OQPSK receivers as well as PSK and QAM receivers is...
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7248647 |
Radio telecommunications system operative by interactive determination of soft estimates, and a corresponding method
A system to communicate digital data symbols with higher than QPSK modulation comprises a transmitter and receiver. The transmitter comprises, a modulator and circuitry to split and encode the data...
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7239668 |
Coded digital modulation method for communication system
A new class of 16-ary Amplitude and Phase Shift Keying (APSK) coded modulations, called double-ring APSK modulation, based on an amplitude and phase shift keying constellation in which the...
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7191387 |
Method and apparatus for forward error correction
A convolutional decoder for a wired or wireless receiver receiving an encoded datastream. The branch and path metric components compute branch and path metrics for the encoded datastream stream....
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7181186 |
Mixer and frequency conversion apparatus for improving phase-mismatching
A frequency conversion apparatus having a mixer eliminates phase miss-matching between two intermediate frequency (IF) signals having the same frequency and a 90 degree difference in phase. The...
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7162211 |
Methods and apparatus for transmitting information between a basestation and multiple mobile stations
Methods and apparatus for scheduling mobile stations (MSs) to download data and/or to control the rate of downloading to an MS from a base station (BS) as a function of downlink channel condition...
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7099399 |
Distortion-managed digital RF communications transmitter and method therefor
A digital communications transmitter ( 100 ) includes a digital linear-and-nonlinear predistortion section ( 200 ) to compensate for linear and nonlinear distortion introduced by transmitter-analog...
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7079814 |
Estimation of movement
A mobile transceiver and a method of detecting movement of the mobile transceiver in a radio system. The radio system includes at least one base station and terminals. The movement of the mobile...
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7065150 |
System and method for generating a root raised cosine orthogonal frequency division multiplexing (RRC OFDM) modulation
An improved multicarrier modulation system and method, which has the advantages of both isotropic orthogonal transfer algorithm orthogonal frequency division multiplexing (IOTA OFDM) and scalable...
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7049995 |
Method and apparatus for remote control transmission
A remote control is operative to transmit a remote control signal composed of a first portion and a second portion. The first and second portions are typically a pulse and a space. The pulse has a...
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6901246 |
Suppressed cycle based carrier modulation using amplitude modulation
A sinusoidal RF carrier is modulated for the transmission of digital binary data streams through the amplitude suppression of carrier wavelets. These wavelets are defined between zero crossover...
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6836515 |
Multi-modulation radio communications
A radio, and related methods of radio communication, consisting of a multi-modulation modem, wherein the multi-modulation modem that modulates and demodulates signals using a plurality of...
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6836181 |
FSK demodulation system
A FSK demodulation system of the present invention has a means for comparing two preset values across 0, a positive side level shift amount and a negative side level shift amount, with an inputted...
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6778112 |
Adaptive decoding method and apparatus for frequency shift key signals
A adaptive deciding method and apparatus for frequency shift key signals are provided to sample the demodulated FSK signal, input the values of the sample points in sequence to a sample group, and...
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6751265 |
Method and system of amplitude modulation using dual/split channel unequal amplification
A system and method of amplitude modulation is described in which first and second 180 degrees out-of-phase signals are produced and are each amplified by one of two (different amplification...
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6680981 |
&pgr /4 shift QPSK modulator and communication device
The invention provides a π/4 shift QPSK modulator, as well as a communication device, which is capable of reducing the storage capacity of ROM for previously storing impulse response data, and...
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6625231 |
Adaptive phase demodulation
Based on changing reception conditions, a wireless receiver adapts its demodulation method during active communications. Phase errors detected in the received signal indicate current reception...
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6621863 |
Equalizing apparatus combining amplitude error with squared envelope error according to variable weights
An equalizer providing a filtered signal to a data decision unit calculates an amplitude error signal by comparing the filtered signal with the data signal output from the data decision unit, and...
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6553535 |
Power-efficient communication protocol
A method and apparatus for telemetering data on a channel having a maximum data rate by utilizing a power efficient communication protocol is provided. The data to be telemetered comprises a number...
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6553079 |
Digital modulator for angle and/or amplitude modulation
The modulator has an input ( 30 ) which receives data to be modulated. A plurality of memory regions acting as look-up tables ( 38-44 ) are arranged to contain information relating to the...
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6512799 |
Digital communication system and method for increased bit rates
A digital communication system and method is provided for increasing bit-rates while maintaining the reliability of transmitted digital information and avoiding increased power demands. The...
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6477153 |
Method and apparatus for using the sidelobe of a long range antenna for a short range communication link
A communication satellite system ( 100 ) is established using one or more satellite constellations ( 110, 120 ). The two or more satellite groups ( 110, 120 ) are connected via long range...
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6470055 |
Spectrally efficient FQPSK, FGMSK, and FQAM for enhanced performance CDMA, TDMA, GSM, OFDN, and other systems
Spectral efficient transmitters-receivers (transceivers), modulation-demodulation (Modem) methods, architectures, structures and implementation technologies for enhanced performance and increased...
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6456672 |
Automatic frequency control communication system
In a communication system using the time diversity transmission scheme, the communication system provided with the stable automatic frequency control circuit with the wide frequency pull-in range...
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6452977 |
Method and apparatus for AM compatible digital broadcasting
A broadcasting method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel is provided by: broadcasting an amplitude modulated radio frequency signal...
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6411655 |
Systems and methods for converting a stream of complex numbers into an amplitude and phase-modulated radio power signal
A stream of complex numbers is converted into polar form, including an amplitude-representative part and a phase-representative part. The amplitude-representative part of each of the converted...
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6389080 |
Random phase shift keying
Communication architectures and methods that implement random phase shift keying. A transmitter and a receiver are coupled by way of a communications channel. The transmitter uses a data source and...
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6385233 |
Unbalanced quadrature waveform
A method 1100 and apparatus 1200 utilizing unbalanced modulation for providing users in a communication system with different amounts of effective communication energy according to their...
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6381265 |
Field programmable modulator-demodulator arrangement for radio frequency communications equipment and method therefor
A digital signal processing circuit for field programmable radio frequency communications system including a digital controlled numerical controlled oscillator (NCO), dual digital signal...
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6366601 |
Variable rate spread spectrum communication method and apparatus
A communication system ( 100 ) provides selecting a first modulation-coding scheme ( 111 ) based on a quality indicator of a communication between a source user and a first destination user,...
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6356594 |
Data converter
An analogue to digital or digital to analogue data converter 1 for converting between a first digital signal 101,102 at a first sampling rate f o and a first analogue signal 171,172, ...
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6317468 |
IF exciter for radio transmitter
A method and apparatus are provided for modulating an intermediate frequency of a radio frequency transmitter with a digital sample stream. The method includes the steps of interpolating the...
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5930299 |
Digital modulator with compensation and method therefor
In a digital modulator with compensation, a digital bit stream from a microphone (705), a speech coder (706), and a channel encoder (707) is sent to an encoder (720) which translates the bits into...
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5874903 |
RF repeater for automatic meter reading system
An automatic meter reading system utilizes repeater technology to access hard to read meters within a fixed network structure. The components of the radio system that are needed for two-way...
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