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| Number | Title | Issue Date |
| 7035339 | Carrier recovery apparatus for digital QAM receivers A carrier recovery apparatus for digital Quadrature Amplitude Modulation (QAM) receivers is disclosed. The carrier recovery apparatus includes a phase detector, a lock controller, a frequency locker and a phase loop filter, and provide phase/frequency error informat... | 04/25/2006 |
| 7035327 | Adaptive equalizer for use in information reproducing apparatus Hold registers receive a hold register enable signal. When reading one kind signal of header field data, the hold register enable signal is High and the registers store newly renewed values of filter coefficients, and when reading a different kind signal of recordin... | 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 |
| 7031686 | Image rejection mixer with mismatch compensation An image rejection mixer (IRM) for rejecting signals having image frequency and, more particularly, a mixer for rejecting signals of image frequency by using mismatch compensation is provided. The image rejection mixer comprises: first and second mixers; first and s... | 04/18/2006 |
| 7031405 | Carrier phase estimation based on single-axis constant modulus cost criterion and Bussgang criteria Carrier phase recovery employs a single-axis blind cost criterion from the Bussgang class of functions, and its stochastic gradient, to generate a carrier phase error used to adjust a received and demodulated signal to near baseband. For one implementation, the esti... | 04/18/2006 |
| 7031399 | Demodulator having automatic quadrature control function A demodulator for automatically performing quadrature control in which there is no necessity for the modulator side to perform precision adjustment and deterioration in characteristics e.g., error rate is suppressed for long. The demodulator includes a quadrature co... | 04/18/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7027545 | Data sampler for digital frequency/phase determination The present invention, generally speaking, provides a digital circuit and method for forming number streams for frequency and/or phase comparison of digital or digitized signals, referred to herein as clock signals, where typically one of the clock signals is a know... | 04/11/2006 |
| 7027535 | Frequency tracking loop and method of frequency tracking A frequency tracking loop (100) includes: a mixer (122) for correcting frequency offset of an input radio signal that includes bursts of known data; a frequency offset estimator (134), for providing an estimate of frequency offset; a variable ba... | 04/11/2006 |
| 7027529 | Demodulation method and demodulation apparatus A skew detector calculates symbol amplitudes from a first signal (SI′ signal) on an I channel side and a second signal (SQ′ signal) on a Q channel side to be inputted into a carrier reproduction circuit. The skew detector outputs difference... | 04/11/2006 |
| 7024221 | Notch filter for DC offset reduction in radio-frequency apparatus and associated methods A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry coupled together. The receiver analog circuitry receives an RF signal. The receiver analog circuitry processes the received RF signal and generates a digital signal... | 04/04/2006 |
| 7023935 | Trellis based maximum likelihood signal estimation method and apparatus for blind joint channel estimation and signal detection A method and system performs blind joint channel estimation and signal detection in a communication system that includes multiple channels for transmitting symbols. The multiple channels are estimated using a small number of symbols initially received through the mu... | 04/04/2006 |
| 7023928 | Synchronization of a pilot assisted channel estimation orthogonal frequency division multiplexing system A synchronization of a pilot assisted channel estimation orthogonal frequency division multiplexing can be achieved by receiving a signal containing pilot symbols, providing an initial time and frequency synchronization to the signal, phase rotating the signal acros... | 04/04/2006 |
| 7023267 | Switching power amplifier using a frequency translating delta sigma modulator A radio frequency (RF) switching power amplifier comprises: a switching amplifier 203 to provide an amplified signal within an RF band; and a delta signal modulator (DSM) 207 that is operable; to control the switching amplifier in a feedback configurat... | 04/04/2006 |
| 7020226 | I/Q distortion compensation for the reception of OFDM signals A transmitter (102) generates a first set of data symbols and a first pilot symbol (601) at a first time, and a second set of data symbols and a second pilot symbol (602) at a different, second time. The first (601) and second (602... | 03/28/2006 |
| 7020220 | Digital estimation and correction of I/Q mismatch in direct conversion receivers An IQ receiver includes an estimator/compensator module to determine and correct IQ mismatch errors between the I and Q channels of the IQ receiver. The estimator module determines a phase compensation factor C1 and an amplitude compensation factor C... | 03/28/2006 |
| 7020219 | Wireless user terminal and system having high speed, high resolution, digital-to-analog converter with off-line sigma delta conversion and storage A wireless communications apparatus and corresponding system having an improved DAC operable at higher speed than heretofore achievable which exploits the sigma-delta principle in a different way. More particularly, the invention comprises a wireless user terminal (... | 03/28/2006 |
| 7019599 | Apparatus for continuous phase quadrature amplitude modulation and demodulation An apparatus for continuous phase quadrature amplitude modulation and demodulation to continuously process phases and amplitudes at symbol change points in an M-ary quadrature amplitude modulation method. The apparatus includes a continuous phase quadrature modulato... | 03/28/2006 |
| 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 |
| 7016652 | Automatic frequency control receiver The invention relates to a receiver of signals [S] received from a wireless network, said receiver working at a so-called reference oscillation frequency controlled by a so-called reference value [Vref]. Said receiver includes demodulation means [DEMO] for demodulat... | 03/21/2006 |
| 7010286 | Apparatus, system, and method for down-converting and up-converting electromagnetic signals Methods, systems, and apparatuses for down-converting and up-converting an electromagnetic signal. In embodiments, the invention operates by receiving an electromagnetic signal and recursively operating on approximate half cycles of a carrier signal. The recursive o... | 03/07/2006 |
| 7010061 | Configurable all-digital coherent demodulator system for spread spectrum applications A configurable all-digital coherent demodulator system for spread spectrum digital communications is disclosed herein. The demodulator system includes an extended and long code demodulator (ELCD) coupled to a traffic channel demodulator (TCD) and a parameter estimat... | 03/07/2006 |
| 7006805 | Aliasing communication system with multi-mode and multi-band functionality and embodiments thereof, such as the family radio service A receiver having multi-mode and multi-band functionality and capabilities is described herein. The receiver is capable of selectively operating over a plurality of bands and channels. The receiver operates in a plurality of modes, including but not limited to a sin... | 02/28/2006 |
| 7006587 | Preamble aided synchronization The repetitive structure of a preamble signal is exploited to enhance timing synchronization performance and frame start detection performance under adverse channel conditions. Received values are cross-correlated in time against a known noise-free version of the pr... | 02/28/2006 |
| 7006585 | Recovering data encoded in serial communication channels A transition between values of two successive bits is detected. The bit after the transition is used as one of the recovered bits. A recovery circuit may independently generate a sampling clock based on an analog signal, and sample the analog signal at time points s... | 02/28/2006 |
| 7006584 | Demodulator and demodulating method for mobile phone A demodulator and a demodulating method for a mobile phone are provided. In particular, the present invention can simultaneously perform operation of improving the demodulation error rate caused by such as noise and external feedback loop operation being correction ... | 02/28/2006 |
| 7003263 | Telecommunications receiver and a transmitter In a telecommunications transmitter and receiver two IQ-mixers of the same type are operated in 180 degrees phase shift. In both the transmitter and receiver, an input signal is coupled to each IQ-mixer and the output signal of the mixers are combined so as to cance... | 02/21/2006 |
| 7003094 | Adaptive interference cancellation for ADSL An ADSL front end is implemented with an adaptive AM interference canceller to cancel out either a carrier signal of an interfering AM radio signal, or a carrier signal and its sidebands of an interfering AM radio signal, from a received ADSL signal. By canceling an... | 02/21/2006 |
| 7002495 | Analog to digital converter with distortion correction A method of correcting for output distortion of an analog to digital converter (ADC) is disclosed. The method comprises estimating the output distortion and providing an estimated distortion. The method further comprises combining an output of the ADC with the estim... | 02/21/2006 |
| 6999535 | Apparatus, and associated method, for recovering a desired component of a receive signal received at a radio device Apparatus, and an associated method, facilitates recovery of the informational content of a desired component portion of a receive signal received at a radio device. Non-desired component portions of the receive signal, such as interfering components formed as a res... | 02/14/2006 |
| 6999529 | Digital AM demodulator For a digital demodulator for AM demodulation of a difference sound signal in a digital multiplex signal, which multiplex signal also comprises a sum sound signal in the baseband position and a pilot carrier at a pilot frequency, and the difference sound signal is m... | 02/14/2006 |
| 6999527 | Phase demodulator, symbol timing recovery circuit and the method thereof This specification discloses a symbol timing recovery circuit, which includes a transform value generation circuit, a selection circuit, a plurality of accumulators, and a comparison module. Without performing phase difference calculation, the invention is a symbol ... | 02/14/2006 |
| 6999526 | Method for simple signal, tone and phase change detection A method for detecting an information signal, tone and/or a phase change of a tone in one or more signals which contain inter alia this information signal or this tone, is characterised in that each signal is divided into segments (blocks), in that only a selection ... | 02/14/2006 |
| 6999503 | Partial response signaling for orthogonal frequency division multiplexing The system includes a transmitter for generating a signal and a cyclic prefix, wherein the transmitter suppresses a plurality of sub-symbols of the signal to produce a partial response signal. A portion of the partial response signal is dropped and the resulting tru... | 02/14/2006 |
| 6996164 | Self-interference removal using converter compensation in a relayed communication system Self-interference cancellation in two-way relayed communications is improved by creating models of upconverter and downconverter imperfections and then compensating for those imperfections before self interference cancellation processing. The model includes compensa... | 02/07/2006 |
| 6993308 | Radio receiving device and radio receiving method A likelihood calculating section 205 calculates a likelihood of a data portion signal and outputs a weighting coefficient according to the likelihood to a multiplier 206. The multiplier 206 multiplies a data channel estimation value output from ... | 01/31/2006 |
| 6993107 | Analog unidirectional serial link architecture A unified serial link system and method for transmitting digital data across wired media including a transmitter and a receiver. The system comprises a phase locked loop (PLL) control circuit, a phase rotator circuit, a phase buffer circuit, and an equalization driv... | 01/31/2006 |
| 6993098 | Method and apparatus for efficient calculating distance metric A method and an apparatus for determining the log-likelihood ratio of a received signal. The log-likelihood ratio is determined by calculating distance between the received symbol and closest constellation point matching a bit and the distance between the received s... | 01/31/2006 |
| 6989710 | Binary frequency-shift keying demodulator and frequency-to-voltage converter A BFSK demodulator comprises a three-channel frequency-to-voltage converter, an information signal inputting the first-channel frequency-to-voltage converter, a converted information signal inputting the second-channel frequency-to-voltage converter, wherein outputs... | 01/24/2006 |
| 6990157 | All-digital FSK demodulation with selectable data rate and adjustable resolution All-digital FSK demodulation can be accomplished by producing in response to a received IF signal digital information (22) indicative of a frequency of the IF signal. A symbol represented by the IF signal can then be determined (28, 44) in response to ... | 01/24/2006 |
