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| Number | Title | Issue Date |
| 8184745 | System and method of generating soft bits A receiver receives a received signal from a communication link, the received signal comprising a stream of symbols modulated onto a carrier, each of the stream symbols selected from a constellation of symbols to represent a plurality of encoded data bits. The recei... | 05/22/2012 |
| 8170148 | Demodulation circuit, digital microwave system and demodulation method A demodulation circuit, a digital microwave system including the demodulation circuit, and a signal demodulation method are provided. The demodulation circuit includes a first circuit, a second circuit, a third circuit, and a fourth circuit connected in turn. The fo... | 05/01/2012 |
| 8135092 | MIMO-OFDM wireless communication system A MIMO channel frequency response matrix is decomposed into a frequency-related part and a constant part. The constant part is independent of subcarrier index and of number of subcarriers in one symbol interval. Separated QR decomposition and either SVD or GMD is ap... | 03/13/2012 |
| 8045648 | Amplitude-shift-keying (ASK) radio-frequency (RF) signal decoding device and method thereof An amplitude-shift-keying radio-frequency (ASK RF) signal decoding method includes separating a low frequency and a high frequency from an ASK RF signal, which includes a pause section and a non-pause section, generating a divided signal by dividing the high frequen... | 10/25/2011 |
| 7944998 | Audio correlation system for high definition radio blending A system that blends a hybrid radio signal may provide reduced audio content skipping and may determine an audio correlation between analog and digital signal components in the hybrid radio signal before blending from the analog signal component to the digital signa... | 05/17/2011 |
| 7920651 | Joint symbol, amplitude, and rate estimator The system in one embodiment relates to tightly integrating parameter estimation, symbol hypothesis testing, decoding, and rate identification. The present invention provides Turbo-decoding for joint signal demodulation based on an iterative decoding solution that e... | 04/05/2011 |
| 7885359 | Sampling demodulator for amplitude shift keying (ASK) radio receiver A method, algorithm, circuits, and/or systems for amplitude shift keying (ASK) modulation are disclosed. In one embodiment, a sampling demodulator includes a comparator configured to compare an ASK modulated input to a predetermined voltage level and provide a compa... | 02/08/2011 |
| 7809088 | Multiphase receiver with equalization A multiphase receiver to compensate for intersymbol interference in the sampling of an input signal includes a first integrating receiver to integrate and sample data of the input signal on a first phase of a clock and a second integrating receiver to integrate and ... | 10/05/2010 |
| 7787570 | Polar loop radio frequency (RF) transmitter having increased dynamic range amplitude control A closed loop power control system for a radio frequency (RF) transmitter comprises a first variable gain element located in a power control loop and configured to receive a power level signal and an inverse representation of a power control signal, a second variabl... | 08/31/2010 |
| 7782982 | Adaptive deinterleaver memory allocation A receiver for use in a wireless network comprising a communications channel and a method of allocating deinterleaver memory usage in the receiver, wherein the receiver comprises a processor adapted to organize subchannels of the communications channel and set a num... | 08/24/2010 |
| 7733983 | Symbol tracking for AM in-band on-channel radio receivers A method for symbol tracking in AM in-band on-channel radio receivers comprises the steps of: receiving a stream of time domain samples; assembling a set of the time domain samples equal to a symbol time plus a half symbol delay in response to a symbol timing adjust... | 06/08/2010 |
| 7706474 | Carrier tracking for AM in-band on-channel radio receivers A method for carrier tracking in AM in-band on-channel radio receivers comprises the steps of receiving an input signal, generating a local oscillator signal in response to an oscillator control signal, mixing the input signal with a local oscillator signal to produ... | 04/27/2010 |
| 7675998 | Method and circuit for determining a clock signal sampling instant for symbols of a modulation method The invention relates to a method for determining the sampling instant of a clock signal (ti) for a circuit for determining symbols (Se) from a digitized signal (sd, S) which is coupled to at least one quadrature signal pair of a modulation method (QAM), ... | 03/09/2010 |
| 7620122 | Communication apparatus including a demodulator having a tone detection mechanism A communication apparatus includes a receiver may receive a signal including one or more frequencies associated with a symbol. The symbol may be any type of symbol such as a text telephone symbol encoded according to a cellular text telephone modem (CTM) protocol, f... | 11/17/2009 |
| 7620123 | Receiver for estimating signal magnitude, noise power, and signal-to-noise ratio of received signals An improved receiver and method estimate one or more parameters, such as amplitude and signal-to-noise ratio, of a received signal, such as an M-QAM or q-ASK signal. The amplitude of an M-QAM signal is estimated based upon known or ascertainable phase information re... | 11/17/2009 |
| 7613253 | Noise balanced QAM detection A method of demodulating digital data using M'ary QAM has been disclosed, comprising the steps of detecting a complex symbol vector D, establishing within which reference symbol boundaries the detected symbol vector D falls, the given reference symbol boundaries bei... | 11/03/2009 |
| 7609783 | Amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem An amplitude shift keying (ASK) demodulation circuit based on a self sample as a basis application in an organism implantation microsystem is a low-cost and high-performance ASK demodulation core, comprising a pulse shaper, a voltage scaler, a level contrastor, and ... | 10/27/2009 |
| 7583757 | Joint symbol, amplitude, and rate estimator The system in one embodiment relates to tightly integrating parameter estimation, symbol hypothesis testing, decoding, and rate identification. The present invention provides Turbo-decoding for joint signal demodulation based on an iterative decoding solution that e... | 09/01/2009 |
| 7502426 | Method for estimating signal magnitude, noise power, and signal-to-noise ratio of received signals An improved system and method for estimating one or more parameters, such as amplitude and signal-to-noise ratio, of a received signal, such as an M-QAM or q-ASK signal, is set forth herein. The amplitude of an M-QAM signal is estimated based upon known or ascertain... | 03/10/2009 |
| 7492835 | Synchrodyning apparatus Synchrodyning apparatus in which a PAM IF signal is mixed with unmodulated carriers nominally at the frequency of the carrier, which unmodulated carriers are in quadrature with respect to each other. E.g., the PAM IF signal may be an intermediate-frequency 8VSB digi... | 02/17/2009 |
| 7444128 | Method of estimating a high frequency carrier signal A method of estimating the carrier frequency of a signal is disclosed. The method comprising the steps of initializing a time average vector to zero, selecting a user-selectable time segment to divide a received signal into. A signal is received, and divided into th... | 10/28/2008 |
| 7426243 | Preprocessing signal layers in a layered modulation digital signal system to use legacy receivers Systems and methods for receiving non-coherent layered modulation signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital c... | 09/16/2008 |
| 7423987 | Feeder link configurations to support layered modulation for digital signals Systems and methods are disclosed for feeder link configurations to layered modulation. One feeder link system employs feeder link spot beam to antennas in distinct coverage areas to enable frequency reuse. Another system employs narrow beam width feeder link antenn... | 09/09/2008 |
| 7417496 | Demodulator circuit of RFID system Provided is a demodulator circuit allowing a tag or transponder to efficiently recover data of an input amplitude signal at very low power in a wireless communication system such as a radio frequency identification (RFID) system. The demodulator connects an output o... | 08/26/2008 |
| 7363648 | Cable modem tuner An IF input signal corresponding to a selected reception channel is applied through an SAW filter to an IF-AGC circuit, the amplitude of the signal is adjusted to a prescribed level, and the signal is thereafter supplied to a down converter unit. The down converter ... | 04/22/2008 |
| 7348821 | Programmable high-resolution timing jitter injectors high-resolution timing jitter injectors A device includes a first circuit having rows and columns of delay cells to generate delayed signals based on an input signal. The delayed signals are selectable and have a different delay from one another with respect to the input signal. The device is programmable... | 03/25/2008 |
| 7349493 | Demodulation with separate branches for phase and amplitude A receiver architecture is disclosed for use in Time-Division Multiple Access (TDMA) and related digital radio applications which combines the principal benefits of the conventional hard-limiting and linear receiver architectures to support switched-antenna diversit... | 03/25/2008 |
| 7340010 | Forward error correction coding for hybrid AM in-band on-channel digital audio broadcasting systems An AM compatible digital audio broadcasting signal comprises an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by an analog signal, and a plurality of digitally modulated subcarrier s... | 03/04/2008 |
| 7340012 | Single and multiple sinewave modulation and demodulation techniques employing carrier-zero and carrier-peak data-word start and stop A method for detecting encoded digital data from a substantially sinusoidal waveform, the encoded digital data having one of a first value and a second value at selected phase angles θn comprises generating the waveform having an amplitude Y defined by a... | 03/04/2008 |
| 7313150 | Telecommunications signal relay node A relay node is provided for coupling telephone, facsimile or data terminals to a digital packet telecommunications network. The relay node includes a signal discriminator for determining the type of signal coming from a terminal coupled to the node, from amongst a ... | 12/25/2007 |
| 7308046 | System and method for detecting presence of digitally modulated waveform The disclosure is directed to a system for detecting digitally modulated waveforms on a transmission channel. The system includes an amplitude modulation detector configured to detect amplitude variations on the transmission channel. The system also includes a first... | 12/11/2007 |
| 7277494 | 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 communication applications, and allowing for amplitude scaling to facil... | 10/02/2007 |
| 7239674 | 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 communication applications, and allowing for amplitude scaling to facil... | 07/03/2007 |
| 7239431 | System and method for recovering primary channel operation in a facsimile receiver and facsimile machine incorporating the same A system for, and method of recovering primary channel operation in a facsimile (fax) receiver and a fax machine that incorporates the system, the method or both. In one embodiment, the system includes: (1) a signal receiver that receives a signal containing first a... | 07/03/2007 |
| 7221718 | I/Q demodulator and I/Q signal sampling method thereof An I/Q demodulator optimized with a minimum amount of hardware. First and second multiplexers generate I and Q signals with respect to an input data signal; and first and second 2-decimation units decimate the I and Q signals generated by the first and second multip... | 05/22/2007 |
| 7218642 | Methods and systems for high speed broadband digital link Provided herein are methods and systems for a digital subscriber line protocol that does not require amplitude modulation, as well as methods and systems for such a protocol that can be used in combination with amplitude-modulation techniques to provide superior bro... | 05/15/2007 |
| 7206356 | Wireless transmitter with reduced power consumption This wireless transmitter is composed of at least one modulator, which comprises a digital part and an analog part. The digital part comprises elements for generating the envelope of the signals to be transmitted and elements for generating the phase of the signals ... | 04/17/2007 |
| 7176740 | Level conversion circuit A level conversion circuit that prevents the operation speed from decreasing when the power supply voltage decreases while appropriately performing level conversion. The level conversion circuit includes first and second PMOS transistors. A first NMOS transistor is ... | 02/13/2007 |
| 7173981 | Dual layer signal processing in a layered modulation digital signal system Systems and methods for receiving layered modulation for digital signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital co... | 02/06/2007 |
| 7167518 | Bandwidth-efficient modulation in communication systems A transmitter of digital data includes a modulator with an input for a carrier signal and an input for a first stream of control symbols. The modulator modulates the carrier signal with a second stream of symbols produced by the modulator. Each symbol of the second ... | 01/23/2007 |
