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7606321 |
System and method for simplifying analog processing in a transmitter incorporating a randomization circuit
The system and method enable simpler analog processing in a transmitter by reducing the number of bits in a digital signal through delta sigma modulation. Selection of current sources in a digital...
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7583744 |
Method and apparatus for computing soft decision input metrics to a turbo decoder
A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature...
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7545881 |
Method and apparatus for controlling spurious transmissions in a communications system
A method and a power control device moving the resynchronisation point within the guard period to coincide with a calculated reduction in the RF PA power level such that the spurious frequency...
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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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7515645 |
Method for dividing the bit rate of QPSK signals into two or several subchannels
The invention relates to a method for dividing the bit rate of QPSK signals by splitting the spectrum of said QPSK signals into at least two channels having band-limited filters in the modulator...
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7480351 |
Technique for demodulating level II hierarchical data
A technique for demodulating secondary data from a hierarchically modulated signal includes a number of steps. A gray coded eight phase shift key (8-PSK) hierarchically modulated signal is received...
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7457375 |
Timing extractor, timing extraction method, and demodulator having the timing extractor
In a timing component extractor for a digital modulated signal, a frequency converting section 30 receives a complex baseband signal having a symbol rate fs and formed from an I signal and a Q...
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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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7436902 |
Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation
Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation. A novel approach is provided within LDPC coded...
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7409012 |
Modulator and signaling method
Phase shift key modulators ( 100, 500, 1000, 1400, 1700 ) are provided in which a multiphase signal source ( 108, 1402, 1406 - 1412,1702 ) is used to generate a plurality of phases of a carrier...
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7369598 |
Ultra-wideband receiver and transmitter
A waveform-adaptive ultra-wideband (UWB) transmitter and noise-tracking UWB receiver for use in communications, object detection and radar applications. In one embodiment, the output of an...
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7352822 |
Telephone for transmitting an uplink signal to a base station and for receiving first and second downlink signals from the base station, and a base station for receiving an uplink signal from a telephone and transmitting first and second downlink signals to the telephone
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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7315574 |
System and method for generating a jittered test signal
A multi-speed jittered signal generator ( 216, 400 ) that generates a full-speed jittered signal ( 404 ) by scaling a low-speed jittered signal ( 420 ) using a frequency scaler ( 428 ). The...
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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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7221908 |
Radio communication apparatus
A communication apparatus operating under a back scattering system involving processes of QPSK modulation is provided. The apparatus includes: a first signal channel for acquiring a first reflected...
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7210057 |
Low-speed DLL employing a digital phase interpolator based upon a high-speed clock
A low-speed DLL facilitates a deskewed interface between a high-speed RX data demultiplexer circuit directly to an Application Specific Integrated Circuit (ASIC) with which it is integrated by...
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7173974 |
Method and apparatus for computing soft decision input metrics to a turbo decoder
A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature...
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7149253 |
Wireless communication
A frequency division multiplexing wireless transmission on two or more antennas with the set of symbols on subcarriers of a burst transmitted by one antenna transformed into another set of symbols...
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7092461 |
Polyphase receivers
A polyphase receiver comprises an RF front end ( 10 to 28 ) for receiving a wanted data signal modulated on a carrier signal and for producing quadrature related low IF signals, an image...
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6985538 |
Digital radio communication system and method
QPSK modulated quadrature baseband signal generating section 301 generates a QPSK modulated quadrature baseband signal. 8PSK modulated quadrature baseband signal generating section 302 ...
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6915472 |
Decoding data from multiple sources
Systems and methods for sharing a single decoder among data streams originating with multiple sources. Error correction coding techniques are modified to facilitate decoding of data from multiple...
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6909877 |
Carrierless ultra wideband wireless signals for conveying data
A method for conveying application data via carrierless ultra wideband wireless signals, and signals embodied in a carrierless ultra wideband waveform. Application data is encoded into wavelets...
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6865235 |
Multi-protocol modulator
A multi-protocol modulator capable of supporting two or more different modes of operation, each mode of operation corresponding to a different type of modulation, comprises an m-level phase shift...
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6850733 |
Method for conveying application data with carrierless ultra wideband wireless signals
A method for conveying application data via carrierless ultra wideband wireless signals, and signals embodied in a carrierless ultra wideband waveform. Application data is encoded into wavelets...
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6731679 |
Modulator/demodulator and method of modulation/demodulation used for same
A modulator converts an inputted data to be transmitted into a septenary data, modulates a carrier by the converted data, and transmits the modulated carrier via an antenna. A demodulator...
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6654921 |
Decoding data from multiple sources
Systems and methods for sharing a single decoder among data streams originating with multiple sources. Error correction coding techniques are modified to facilitate decoding of data from multiple...
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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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6608874 |
Method and apparatus for quadrature multi-pulse modulation of data for spectrally efficient communication
A modulator produces a modulated signal including a carrier and data signals representing data bits. The data signals include at least two in-phase modulating pulses which have different shapes and...
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6549588 |
Communications system and corresponding receiver unit
Angle-modulated signals are transmitted in a communications system, in which coding information has been inserted into the transmitted data at regular intervals. The coding information is...
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6505032 |
Carrierless ultra wideband wireless signals for conveying application data
A method for conveying application data via carrierless ultra wideband wireless signals, and signals embodied in a carrierless ultra wideband waveform. Application data is encoded into wavelets...
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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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6445746 |
IS-136&plus slot formation
A system and method for demodulating slots having a mixed slot formation including differential and coherently encoded slots is disclosed. The method includes pre-phase encoding data and a...
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6438158 |
Method and apparatus for implementing enhanced multiple modulus conversion techniques in a signal point mapping context
The present invention relates to multiple modulus conversion (MMC) techniques for mapping data in a pulse code modulation (PCM) modem system. In accordance with the present invention, signal point...
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6321076 |
90° phase shifter and image rejection mixer
A phase shift circuit includes a first phase shifter, second phase shifter, and adder. The first phase shifter receives an input signal and obtains first and second intermediate phase shift signals...
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6320842 |
Spread spectrum communication apparatus
In a communication apparatus of the transmitting side, n number of parallel signals are respectively spread-modulated by the n number of spreading codes and summation thereof is obtained. Also, m...
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6160855 |
Digital modulation method and digital communication system
A digital communication method and system wherein in response to input 3-bit data, a phase and amplitude of a carrier signal are controlled so that a symbol at a given time is located at one of...
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6125148 |
Method for demodulating information in a communication system that supports multiple modulation schemes
A method of demodulating voice or data and control information in systems that support multiple modulation schemes modulates voice or data using a first linear modulation scheme, such as 16QAM...
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6061408 |
Method and apparatus for 45° phase ambiguity resolution for one coded bit per symbol 8PSK modulation
A method and apparatus for 45° phase ambiguity resolution for one coded bit per symbol 8PSK modulation resolves phase ambiguity by selection of pre-differential encoders. A trellis encoder for...
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6021160 |
Training method for non-nyquist transmission system and training data transmission apparatus for non-nyquist transmission system
The invention provides a training method for a non-Nyquist transmission system and a training data transmission apparatus for a non-Nyquist transmission system by which initialization processing of...
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6014065 |
Multi-phase modulator having automatic compensators for offsets of orthogonal adjustment
A multi-phase modulator for modulating n digital data into a 2 n digital phase modulated signal includes digital-analog convertors for converting the digital data into analog signals, automatic...
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5974096 |
Digital quadrature detection circuit
An object is to provide a digital quadrature detection circuit wherein, without making the circuit complicated and without lowering performance, the operating frequency can be lowered and power...
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5966411 |
Multipath equalization using taps derived from a parallel correlator
A communication system (10) includes a central terminal (12) and a subscriber terminal (14) that communicate information through an air interface (16). A receiver (22) suitable for deployment in...
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5878085 |
Trellis coded modulation communications using pilot bits to resolve phase ambiguities
A communication system (10) includes a rotationally invariant pragmatic trellis coded modulation (PTCM) encoder (18) and decoder (34). The PTCM encoder (18) partitions information bits (20) into...
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5838797 |
Secure communication by encryption/decryption of vector at PSK modulation/detection stage
At the transmit end of a secure communication system, an input data symbol is mapped to a corresponding vector in a two-dimensional phase plane. The vector is pseudorandomly phase-rotated in a...
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5832044 |
Transmitter antenna diversity and fading-resistant modulation for wireless communication systems
The present invention provides a bandwidth-efficient fading-resistant transmission scheme where a base station implements transmitter diversity using L antennas or L carrier frequencies or L time...
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5822375 |
Method for detecting received signal sequences
This invention is a method for detecting received signal sequences of a communication system transmitting differentially encoded MPSK (Multiple Phase Shift Keying) signal sequences. This invention...
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5818867 |
QPSK/QBL-MSK waveform enhancement
A modulator device is disclosed for a spread spectrum communication system which generates a modulated signal from incoming data. The device includes a QPSK portion for separating the incoming data...
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5757856 |
Differential coder and decoder for pragmatic approach trellis-coded 8-PSK modulation
The invention relates to an 8-PSK differential coder for trellis-coded modulation and to a corresponding pragmatic decoder, enabling 90°, 180°, and 270° phase ambiguities to be lifted. The...
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5696792 |
Digital radiocommunication terminal
The number of oscillators required to construct a digital radiocommunication terminal can be reduced and a circuit used for the digital radiocommunication terminal can be reduced in size. For this...
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