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| Number | Title | Issue Date |
| 7623594 | Satellite receiver system An SDARS receiver for use with at least two antennae, each of which receives bitstreams from a first satellite, bitstreams from a second satellite, and bitstreams from a terrestrial repeater, including demodulators configured to switch between demodulating bitstream... | 11/24/2009 |
| 7492836 | Wireless data communication demodulation device and demodulation method When a first half of a transmission packet is sent by an FSK modulating signal, and a latter half thereof is sent by a PSK modulating signal, a received signal is converted into an intermediate frequency signal by a mixer. The converted intermediate frequency signal... | 02/17/2009 |
| 7443928 | Signal detection using sphere decoding technique Method and apparatus for detecting a signal are disclosed, wherein first set of symbols represents a signal received in a receiver. A second set of symbols is estimated, representing the signal transmitted at a transmitter using a sphere decoding technique. The esti... | 10/28/2008 |
| 7424068 | Method and system for coding/decoding signals and computer program product therefor A method for decoding signals with encoded symbols over a symbol interval that modulate a carrier. The method includes phase locking the signal to be decoded to obtain a phase-locked signal. The value assumed by the phase-locked signal on at least one subinterval in... | 09/09/2008 |
| 7424662 | Method and system for providing low density parity check (LDPC) encoding An approach is provided for a method of encoding structure Low Density Parity Check (LDPC) codes. Memory storing information representing a structured parity check Matrix of Low Density Parity Check (LDPC) codes is accessed during the encoding process. The informati... | 09/09/2008 |
| 7362814 | Memoryless spectrum correction algorithm for non-ideal I/Q demodulators An algorithm for correcting the output of an analog I/Q demodulator without the need for calibration or storing state information. The output of the analog I/Q demodulator is digitized, and the discrete-time samples are divided into segments. A digital frequency tra... | 04/22/2008 |
| RE40254 | Method and system for realising a fast control channel in a cellular radio network Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111-120; 211-220... | 04/22/2008 |
| 7333576 | Digital demodulation device and synchronization detecting method A synchronization error occurs when a DTV signal is distorted on a transmission path and this deteriorates demodulation capability. The digital demodulation device and the synchronization detecting method of the invention can correct the synchronization position whe... | 02/19/2008 |
| 7315576 | System for soft symbol decoding with MIMO log-map detection A soft symbol decoder for use in a multiple input multiple output (MIMO) and OFDM (orthogonal frequency division multiplexing) system. The decoder generates soft symbol values for a digital signal that represents a number of source bits. The source bits are transmit... | 01/01/2008 |
| 7289577 | Modulation method and radio communication system An input digital signal is periodically and alternately subjected to first modulation and second modulation, being thereby converted into a pair of a baseband I signal and a baseband Q signal. The first modulation and the second modulation are different from each ot... | 10/30/2007 |
| 7280619 | Method and apparatus for compensating I/Q imbalance in receivers A method and apparatus for compensating I/Q imbalance in receivers is described. The method includes determining a difference between energies of two quadratures, correcting an amplitude imbalance using the difference between the energies of two quadratures, determi... | 10/09/2007 |
| 7254187 | Narrow band chaotic bi-phase shift keying A system and method for signal transmission and reception by narrow band chaotic bi-phase shift keying includes a forward error correction encoder for receiving input data, a data packetizer in signal communication with the forward error correction encoder, a compre... | 08/07/2007 |
| 7205859 | Method and apparatus for sub sample-per-symbol demodulator for a spectrally efficient waveform with an LPI feature An apparatus and method for transmitting and receiving a communication signal includes selecting a pulse shape for a continuous phase modulated waveform, encoding specific information into the waveform to form a communication signal and transmitting the communicatio... | 04/17/2007 |
| 7177364 | System, decoder and method for transmitting, receiving and decoding high-speed digital data signals with reduced electromagnetic emissions A digital communications system includes a transmitter and a receiver. The transmitter is capable of quadrature amplitude modulation (QAM) encoding each bit of at least one n-bit digital signal into at least one QAM signal and thereafter transmitting the QAM signals... | 02/13/2007 |
| 7142617 | Narrow band chaotic frequency shift keying A system and method for signal transmission and reception by narrow band chaotic frequency shift keying includes a forward error correction encoder for receiving input data, a data packetizer in signal communication with the forward error correction encoder, a compr... | 11/28/2006 |
| 7139334 | Cooperative code-enhanced multi-user communications system A cooperative code-enhanced multiuser communications system having a receiver for resolving user ambiguity in a received composite signal by using convolutional encoder state machine properties to analyze strings of bit sums and separate out individual user data. Th... | 11/21/2006 |
| 7039123 | Signal demodulation method and apparatus for reproducing data from received signal A demodulation method, and apparatus, for reproducing data from a received signal. The demodulation method includes the steps of: receiving a signal including a series of frames each containing a training signal for automatic equalization processing and a data signa... | 05/02/2006 |
| 7035029 | Method of and apparatus for recording/reading information, circuit for recording/reading signal An information recording/reading apparatus employs a preamble to reproduce a clock used when recording information in a recording medium and reads the information out of the recording medium at a timing synchronized with a read signal. The preamble is split and reco... | 04/25/2006 |
| 7035354 | CDMA multi-user detection with a real symbol constellation A method for multi-user detection includes receiving a complex input signal due to a superposition of waveforms encoding symbols in a real-valued constellation, which are transmitted respectively by a plurality of transmitters in a common frequency band. The complex... | 04/25/2006 |
| 7031334 | Method and system for realising a fast control channel in a cellular radio network Signalling information is conveyed from a transmitting device (101) to a receiving device (102) in a cellular radio network where user data transmission takes place on a traffic channel in discrete transmission bursts (111–120; 211–220; 310–31... | 04/18/2006 |
| 6956915 | Method of correcting frequency error A method of correcting frequency errors for use in CDMA mobile radio terminals which is adaptive, depending on the value of the frequency error. There are thus three different frequency error correction processing modes: a processing mode with no correction, an open... | 10/18/2005 |
| 6947508 | Method and apparatus for estimating the frequency and/or phase of a digital signal An apparatus and method for estimating a frequency and/or a phase of a digital input signal by determining phase values of the input signal. The phase values are then added over a predetermined summation length N/B. The sampling rate of the added-up phase values are... | 09/20/2005 |
| 6937871 | Anti-demodulator circuit, filtering device and demodulator circuit The invention relates to an anti-demodulator circuit which is fundamentally built up in the same way as a demodulator circuit but, instead of a bandpass filter as generally used in a demodulator, comprises a notch filter which receives an input signal comprising a u... | 08/30/2005 |
| 6928110 | Adaptive equalizer training circuit, modem apparatus and communication apparatus A training circuit for training a tap coefficient of an adaptive equalizer that performs error calculations in a training process and updating of the tap coefficient in a time area and thereby makes the tap coefficient converge stably in a short time. ... | 08/09/2005 |
| 6611198 | Electronic reader for reading a special characteristic of an object An object identification system and method detects the presence of a target object in a field of inspection and in one aspect of the invention, generates a first signal if the object is left in the field of inspection for more than a minimum threshold per... | 08/26/2003 |
| 6522637 | System and method for allocating a carrier wave frequency of one channel between two carrier wave frequencies of another channel A transmission apparatus and method for a frequency division multiple access (FDMA) system that uses FSK (frequency shift keying) or OOK (On/Of keying) modulation. The apparatus includes a plurality of FSK (or OOK) modulators, each of which allocates a ma... | 02/18/2003 |
| 6470056 | Offset QPSK modulation analytic system The offset QPSK modulation analytic system capable of estimating the initial phase of an offset QPSK modulated signal is disclosed. For each of a plurality of candidate values for the initial phase, the correlation coefficient between a signal whose clock... | 10/22/2002 |
| 6456671 | Decision feedback phase tracking demodulation The present invention provides a method and apparatus 200 for phase tracking coherent detection in a communication system. The method provides receiving a waveform which carries information including both phase reference information and data information. ... | 09/24/2002 |
| 6449319 | Receiver with a clock signal generator In a receiver, a reference frequency oscillator (RFO) generates a reference frequency signal having a reference frequency (Fref). A clock circuit derives a clock signal (CLK) from the reference frequency signal. A frequency converter (FRC) converts an inp... | 09/10/2002 |
| 6445751 | Estimation of frequency offset in a communication system Frequency offset of a receiver employing frequency or phase shift keying is estimated by performing a pair-wise weighted summation of consecutive received training symbols, where each weighting factor is related to the ratio of the corresponding training ... | 09/03/2002 |
| 6445745 | Phase encoding methods for handling multiple phase modulated signals on a single channel A method for phase encoding DPSK and N-PSK which maintains phase continuity and which does not require any reference symbols when using N-PSK. A sequence of known DPSK phases are encoded with respect to an initial phase. The N-PSK phases are then all offs... | 09/03/2002 |
| 6411199 | Radio frequency identification system A radio frequency identification system includes a transponder and a transponder reader. The transponder, responsive to an interrogation signal continuously transmitted by the transponder reader, generates a transponder signal modulated by an identificati... | 06/25/2002 |
| 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 modulation scheme, and modulates control information using a s... | 09/26/2000 |
| 5809084 | Data receiving in a digital mobile communication A data receiving system has a radio frequency unit for demodulating a series of signals transmitted at a carrier wave frequency, a local oscillating unit for generating a demodulating frequency used for the demodulation of the series of signals, an equali... | 09/15/1998 |
| 5673293 | Method and apparatus for demodulating QAM and VSB signals Method and apparatus for providing a QAM, a VSB, and a joint QAM/VSB demodulator are described. The describe demodulators are designed to minimize the amount of duplicated circuitry required to implement a joint QAM/VSB demodulator capable of performing t... | 09/30/1997 |
| 5648985 | Universal radio architecture for low-tier personal communication system An integrated circuit chip set is provided for use in a radio communication system in which a modulated digital input signal is processed for transmission and a modulated signal received from an antenna is processed to provide an output signal, wherein th... | 07/15/1997 |
| 5602868 | Multiple-modulation communication system A multiple-modulation communication system includes a transmitter that modulates and transmits communication signals modulated by a first modulation technique and communication signals modulated by a second modulation technique. The first modulation techn... | 02/11/1997 |
| 5504784 | Viterbi algorithm decoding method and apparatus A method of decoding (311 and 417) by Viterbi algorithm is applied with a metric that limits effects on the metric's value. A received signal (109) comprised of symbols is filtered, thereby providing (303 and 403) a phase angle of the received signal (109... | 04/02/1996 |
| 5321726 | Calibration of vector demodulator using statistical analysis In the calibration of a vector demodulator, a statistical approach is used for the analysis and correction of received data. The magnitude of each vector, defined by an (I,Q) pair in a received data signal, is examined. If each measured magnitude has a pr... | 06/14/1994 |
| 5197085 | Radio receiver A receiver for FSK signals produces quadrature related first and second frequency down-converted difference signals (I and Q), which are amplitude limited to form respectively first and second square wave signals. The first and second square wave signals ... | 03/23/1993 |
