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| Number | Title | Issue Date |
| 7343015 | Method and apparatus for high fidelity wireless stereophonic transmission utilizing dual frequency carriers A method and system is disclosed for transmitting two related channels of signals through the air. A first channel of signals is modulated with a first carrier frequency, and a second channel of signals is modulated with a second carrier frequency. The modulated fir... | 03/11/2008 |
| 7317698 | Interference detection, identification, extraction and reporting An adaptive notch filter (ANF) module selectively filters a received wideband communication signal to eliminate narrowband interference that lies within the frequency spectrum of the wideband communication signal. To determine the presence of narrowband interference... | 01/08/2008 |
| 7263134 | Ethernet transceiver with single-state decision feedback equalizer Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is partitioned into two stages; a first stage compensates ISI components i... | 08/28/2007 |
| 7206146 | Biphase magnetic pattern detector using multiple matched filters for hard disk drive A hard disk drive (HDD) holds data using a biphase scheme. A plurality of matched filters are used to detect binary data represented by the biphase pattern without the need for synchronous sampling or equalization. ... | 04/17/2007 |
| 7194208 | Wavelength-division multiplexing optical transmission system and optical communication method A wavelength-division multiplexing optical transmission system for providing a compensating-purpose dispersion D2 to a wavelength-division multiplexing optical signal to be transmitted through an optical transmission path from a transmitter terminal to a rece... | 03/20/2007 |
| 7184474 | Colored noise detection algorithms This invention provides colored noise detection algorithm(s). This colored noise detection algorithm(s) may be implemented with a multi-branch equalizer processing module that enables interference cancellation when colored noise is associated with received radio fre... | 02/27/2007 |
| 7133467 | Demodulation apparatus and demodulation method The number of spreading codes multiplexed in a received signal is detected, and switches 4 and 5 are switched to the RAKE demodulation section 2 side if the detected number of spreading codes is less than a predetermined threshold value, and to ... | 11/07/2006 |
| 7116735 | Adaptive equalization apparatus and method A correlation between a received signal and a sync word signal is calculated. A window signal having a time span which is equal to an equalization range for an adaptive equalizer is defined. A power sum of the correlation output signal in each of window signals #... | 10/03/2006 |
| 7082174 | Method and apparatus for processing a modulated signal using an equalizer and a rake receiver In a method for achieving higher S/N, one or more signals are received and processed to provide one or more streams of samples. In a first processing scheme, the sample stream(s) are equalized and combined within an equalizer to generate symbol estimates, which may ... | 07/25/2006 |
| 7068990 | Receiver for two orthogonally polarized signals The inventive receiver has a receiving branch for each of the two signals (EH, EV) and a demodulator (MHE, MVE) and means (SH, SV) for synchronising the phase of the received signal (EH, EV) with the transmitting phase are provided in said branches, respectively. Po... | 06/27/2006 |
| 7065125 | Method and apparatus for multiple access over a communication channel This invention is a multiple access communication technique by which a multitude of transmitters communicate with receivers using direct sequence spread spectrum signaling. The direct sequence codes are reused by a large number of simultaneous transmitters, so the s... | 06/20/2006 |
| 7043026 | Method for removing AM neighboring interference and a circuit for the same An AM neighboring interference removing method and circuit is provided which can select only a desired AM modulation wave even if an interference AM modulation wave is partially superposed upon the desired AM modulation wave. An AM modulation wave desired to be rece... | 05/09/2006 |
| 7016661 | Multi-mode receiver for frequency error mitigation The present invention provides a multimode receiver design for mitigation of frequency offset by selective demodulation of an input modulated signal. The receiver (103) comprises a plurality of demodulators (207). Each of the plurality of demodulators ... | 03/21/2006 |
| 7016436 | Selective joint demodulation systems and methods for receiving a signal in the presence of noise and interference A signal is received in the presence of noise and interference by demodulating the signal when a relationship between the signal and the noise and the interference meets a criterion, and by jointly demodulating the signal when the relationship between the signal and... | 03/21/2006 |
| 6969984 | Direct phase and frequency demodulation The present invention, generally speaking, provides a time shift angle demodulator that is of simple construction and has an extended linear range. Range extension is achieved by using the input signals directly, not simply post-processing the S-PFD outputs. In acco... | 11/29/2005 |
| 6927623 | Amplitude-modulated signal receiving circuit To improve the quality of the demodulated signal without altering the form in which an AM radio wave is transmitted, the received amplitude-modulated signal is converted to a single-sideband signal, and the information signal demodulated from the phase term of this ... | 08/09/2005 |
| 6914885 | Methods, wireless radio receivers, and systems for selecting a data stream from concurrently demodulated radio signals A demodulated data stream is selected by concurrently demodulating radio signals to provide a first data stream and a second data stream with the first data stream. A first error level associated with the first data stream is determined. A second error level associa... | 07/05/2005 |
| 6912249 | Method and system for training a radio receiver A system and method for training a radio receiver to mitigate the effects of ISI caused by multi-path includes receiving a header of a transmitted packet at the receiver, the header containing at least one flag to identify a corresponding reference training sequence... | 06/28/2005 |
| 6901108 | Apparatus and method for adaptive control An adaptive controller generates a sequence of dither signals for each of a plurality of control parameters. Each dither signal sequence is uncorrelated with every other dither signal sequence. Each nominal control signal has the first of its respective dither signa... | 05/31/2005 |
| 6809584 | Signal transmission and receiving methods optimized for integrated circuit implementation A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second current-mirror output signals of same amplitude and frequency as the mod... | 10/26/2004 |
| 6628706 | Method and apparatus for transforming a channel estimate Channel estimation is performed for a received signal, wherein different parts of the received signals are modulated using different modulation types. The channel is first estimated based on part of a received signal modulated with a first modulation type... | 09/30/2003 |
| 6593805 | Demodulation apparatus A demodulation apparatus of the present invention comprises: an A/D converter for sampling and quantizing a baseband signal; a transversal filter having time-shifted tap coefficients; a decision unit for decoding the signal which has undergone the transve... | 07/15/2003 |
| 6483381 | Signal transmission and receiving methods optimized for integrated circuit implementation This invention discloses a demodulation method. The method includes steps of: A) Receiving a modulated input signal having an input signal frequency. B) Generating a first switch control signal at a first switching frequency substantially equal to the inp... | 11/19/2002 |
| 6459333 | Differentiate and divide FM demodulator An FM demodulator in accordance with the present invention receives a composite signal from an antenna and corresponding processing circuitry. The composite signal includes a carrier signal having a voice/data signal modulated thereon. The composite signa... | 10/01/2002 |
| 6373883 | Radio receiver and a radio transmitter A radio receiver is adapted to receive radio signals in at least two frequency bands, in which the radio signals are modulated by information signals. The radio receiver includes a device for down-converting a received radio signal to an intermediate freq... | 04/16/2002 |
| 6297691 | Method and apparatus for demodulating coherent and non-coherent modulated signals A receiver receives modulated message signals in non-coherent FSK and coherent 8PSK protocols. A selectively configurable processor demodulates the message signals, and includes a demodulator that derives in-phase and quadrature signals based on the messa... | 10/02/2001 |
| 6204735 | Geometrically modulated waves A novel communications method for generating specific unique information containing waveforms, for geometrically modulating a signal with those waveforms, and an apparatus for generating the waveforms, geometrically modulating carrier waves with those wav... | 03/20/2001 |
| 6167081 | Dual mode receiver A demodulation subsystem includes an equalizing demodulator and a non-equalization demodulator, each of which receive a baseband signal, and an output control selector that selects the output of one of the equalizing demodulator and the non-equalizing dem... | 12/26/2000 |
| 6163209 | Demodulation of angle modulated carriers using a noncoherent reference A technique for demodulating a message signal from an angle modulated carrier signal. A noncoherent, independent, periodic reference is generated to have a predetermined phase characteristic and which is noncoherent with and independent of the angle modul... | 12/19/2000 |
| 6037835 | Multi-mode autonomous selection demodulator A method for multi-mode autonomous selection demodulation is disclosed. The method includes the step of providing a receiver with demodulation circuitry (110-112) capable of demodulating a plurality of waveform modulation techniques. The method also inclu... | 03/14/2000 |
| 6005896 | Radio data communication device and radio data communication method A radio data communication device that can perform a packet communication with the packet configuration suitable for transmission of a large volume of data in packet communications utilizing a low rate transmission mode and a high rate transmission mode. ... | 12/21/1999 |
| 5987068 | Method and apparatus for enhanced communication capability while maintaining standard channel modulation compatibility In a radio communication system (100), enhanced communication capability is provided while maintaining standard channel modulation compatibility. At a transmitter (110, 200, 600), a first information signal is generated from data according to a predefined... | 11/16/1999 |
| 5920238 | Geometrically modulated waves A novel communications method for generating specific unique information containing waveforms, for geometrically modulating a signal with those waveforms, and an apparatus for generating the waveforms, geometrically modulating carrier waves with those wav... | 07/06/1999 |
| 5767738 | Apparatus and method for demodulating a modulated signal A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulato... | 06/16/1998 |
| 5745005 | Demodulating system for carrier-wave and single pulse modulated signals A communication device which is capable of automatically discriminating whether a received signal is a carrier-wave-modulated signal or a single-pulse-modulated signal and obtaining a corresponding demodulated signal, thereby reducing a burden to a user i... | 04/28/1998 |
| 5697086 | Co-channel FM signal/interference canceller A combination of two phase-lock loops, and a cancellation circuit are used to remove a dominant FM signal from within a signal environment. The two phase-lock loops together produce a replica of the highest power (i.e. dominant) FM signal. The cancellatio... | 12/09/1997 |
| 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 |
| 5648986 | Receiver in digital radio communication device with selective equalization A digital radio communication device which prevent deterioration of an error rate of a demodulated signal caused by equalization processing of an output of a digital demodulation circuit, and that can always provide optimal reception regardless of presenc... | 07/15/1997 |
| 5615411 | Method and apparatus for composite signal separation and FM demodulation A composite signal recognizer, separator, and FM demodulator apparatus for processing received radio signals. The receiver utilizes N demodulators to process a received signal, where N is equal to or greater than the number of co-channel signals or percei... | 03/25/1997 |
| 5602484 | Delay-spread sensor and detection switching circuit using the same A multipath component detector detects the correlation between a received signal and a reference signal in a training period of the received signal and estimates and outputs the multipath received component levels at a plurality of timing points. A compon... | 02/11/1997 |
