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8855234 Method and system for baseband predistortion linearization in multi-channel wideband communications systems  
An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing...
8849227 Systems and methods for controlling the second order intercept point of receivers  
In accordance with some embodiments, methods for controlling the second order intercept point in a receiver are provided, the methods comprising: generating an amplitude modulated test tone;...
8588353 Frequency selective IQ correction  
In conventional radio frequency (RF) systems, transmitters will usually convert baseband signals to RF so as to be transmitted. As part of the conversion process, the transmitters will perform...
8509341 Communications device including a filter for notching wideband transmit signals and associated methods  
A communications device includes a modulator and a filter downstream therefrom and operable to generate an output wideband complex signal with a frequency notch therein. The filter includes a...
8509347 Method and system for baseband predistortion linearization in multi-channel wideband communication systems  
In some embodiments, a method of reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques is...
8390425 RFID reader systems with double conversion and methods  
RFID readers, reader systems, and methods are provided that utilize double conversion for received tag response signals. A digitized signal is derived from the tag response signal by first...
8350665 RFID reader systems detecting pilot tone  
RFID tags are commanded to generate a pilot tone in their backscatter. When the backscattered pilot tone is received in the reader, the pilot tone is used to estimate the tag period/frequency....
8290100 Interference detection and mitigation  
Techniques for detecting and mitigating interference are described. A device (e.g., a cellular phone) senses interference levels and digitally reconstructs the expected interference in the...
8265206 Radio communication device and radio communication method  
A radio receiver which performs iterative decoding of a received signal is provided. The radio receiver comprises: a receiving unit receiving a signal on a symbol-by-symbol basis; a demodulation...
8218687 Frequency dependent I/Q imbalance estimation  
A receiver estimates I/Q imbalance in I and Q input signals using circuitry to separate different frequency components of the I and Q input signals, and estimation circuitry arranged to estimate...
8170151 FSK receiver  
A receiver includes a band-pass filter that limits a passband of an IF (Intermediate Frequency) signal, an FSK detector that detects the IF signal passing through the band-pass filter to generate...
8160191 Correction of quadrature errors  
Embodiments of the invention are concerned with correction of quadrature errors associated with digital communications systems, and in particular in a wireless transmit chain in which an...
8093765 System for noise reduction in circuits  
Disclosed is an improved noise reducing apparatus using an anti-circuit, including a digital logic circuit and a digital anti-circuit corresponding to the digital logic circuit. The digital...
8093943 Phase noise correction device and its method  
A phase noise correction device having a function for accurately detecting a phase noise component and capable of reducing a load on a reception device is provided. A phase noise correction device...
7728461 System for noise reduction in circuits  
Disclosed is an improved noise reducing apparatus using an anti-circuit, including a digital logic circuit and a digital anti-circuit corresponding to the digital logic circuit. The digital...
7598803 Combined phase-locked loop and amplitude-locked loop module for switching FM signals  
A combined PLL and ALL module for switching FM signals includes a PLL unit and an ALL unit electrically connected therewith. The PLL unit is used to initially process FM signals received from a...
7433428 Method of reducing the variance of the signal-to-noise rate estimated for a signal with amplitude differential phase-shift keying modulation  
This method reduces the variance of the estimation of the signal-to-noise rate in a multiuser digital communications system. These communications require a sending of a phase reference symbol...
7428280 Receiving apparatus and transceiver  
The present invention has a N pieces of receiving antennas, a propagation path characterization estimator, a weight generator for interference canceller, an array processing interference...
7260163 Noise blanker using an adaptive all-pole predictor and method therefor  
A noise blanker (40, 106) monitors and removes noise from a sampled signal by adaptive filtering (98, 150) the sampled signal to generate trained adaptive filter prediction coefficients. The...
7116734 Method and system for providing maximum likelihood detection with decision feedback interference cancellation  
A method for providing maximum likelihood detection with decision feedback interference cancellation is provided. The method includes estimating a current symbol with previous symbol interference...
6985029 Circuit configuration for tolerance correction in a frequency demodulator  
A demodulator has a resistor and a capacitor that may be subject to tolerances. For tolerance correction, the FM demodulator is preferably supplied with a reference frequency, which corresponds to...
6977545 FM signal receiver and wireless communications device using same  
An FM signal receiver for use in receiving a burst signals as in a Bluetooth system includes a BPF and a frequency-demodulation circuit, each having, for example, a phase shifter, which is...
6850113 Demodulator and communication device using the same  
A demodulator includes a reference signal generator for generating a reference signal, an FM demodulation circuit for demodulating a modulated signal, and a control circuit for controlling...
6822508 Communication device, communication method, program, and storage medium  
A high-performance demodulator for use in UWB (Ultra WideBand) multiple-access communication is disclosed. In a communication device, the correlation between a received signal corresponding to...
6735264 Compensation for non-linear distortion in a modem receiver  
A method and modem for communicating serial input data over a transmission link are disclosed. Serial input data is partitioned into parallel data elements prior to rotation by an invertible...
6677816 Circuit arrangement for demodulating signals  
In a circuit arrangement for demodulating signals, particularly frequency-modulated signals, in which a limiter, to whose input the signals to be modulated can be applied, is followed by a...
6664849 Digital FM demodulator performing amplitude compensation  
A digital FM demodulator converts a digital FM input signal to a demodulated signal, detects the amplitude of the digital FM input signal, generates a corresponding amplitude signal, and adjusts...
6295015 Reference generator for demodulator calibration  
A reference generator includes a memory that stores reference data which, when clocked out of the memory, produces an ATSC compliant VSB reference signal substantially free of sub-harmonics of the...
6188275 Demodulator tuned by use of a test signal  
A demodulator circuit for demodulating a frequency modulated input signal includes a filter (12) for receiving an incoming input signal and for providing a filtered output signal, a detector (16)...
6166594 Self calibrating demodulator system  
A reference signal source produces a substantially distortion free reference signal which is supplied to a demodulator that is arranged to demodulate the substantially distortion free reference...
6160444 Demodulation of FM audio carrier  
A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. The phase locked loop is tuned to a selected carrier wave frequency...
6104238 FM demodulator including tuning of a filter and detector  
An FM demodulator circuit includes a filter (10) and a detector (14) for receiving a frequency modulated input signal and for providing a demodulated output signal. A tuning circuit (19) is...
RE36708 Signal to noise ratio enhancement using baseband signals in an FM television system  
In an FM television signal angle modulated with luminance and chrominance information, there exists a high degree of correlation between picture elements occurring one line period apart. In an...
6009126 Zero-IF receiver  
Known is a zero intermediate frequency receiver or zero-IF receiver in which DC-offset correction is done in the I- and Q-paths, after mixing down of the received RF-signal or of an IF-signal....
5966400 Receiver  
Receiver having an RF input for applying an RF input carrier-modulated modulation signal thereto, which receiver is coupled to a multiplier circuit and to a phase-locked loop (PLL) with a signal...
5930310 Interference reduction scheme and method  
This invention relates to telecommunications systems. The present invention provides a system and method operable to the cancel interference from digital subscriber line systems. A data signal...
5691666 Full threshold FM deviation compression feedback demodulator and method  
A FM (Frequency Modulated) DCFB (Deviation Compression Feedback) signal demodulator can be achieved by utilizing FM deviation compression feedback techniques. An FM signal is coupled to a mixer...
5631601 FM demodulation with a variable gain phase locked loop  
A method of demodulating an FM carrier wave and an FM demodulation circuit are described which use a phase locked loop. An FM input signal including the carrier wave is supplied to a phase...
5608762 Apparatus and method for automatic discriminator compensation in a FSK receiver  
A portion of a FSK signal is encoded with a central frequency (f0) and the FSK signal is transmitted. A receiver captures the transmitted FSK signal, and demodulates the FSK signal to provide and...
5572164 FM demodulator with threshold extension and receiver comprising such an FM demodulator  
An FM demodulator having two input terminals (11, 12), to which FM input signals having 90° phase relation are applied, the said FM demodulator including a phase comparator (1) and a tunable,...
5539779 Automatic offset control circuit for digital receiver  
An automatic offset control circuit comprises a differential output preamplifier having an offset adjustment function, further comprising an average detector, a peak detector, and a differential...
5500627 Precision duty cycle phase lock loop  
An up/down counter within a phase locked loop is gated to count high frequency clock pulses during the first cycle of the input signal. Upon detection of a transition in the input signal...
5455536 Demodulator circuit and demodulating method employing bit error rate monitor  
A demodulator circuit and a demodulating method are disclosed. A demodulator including a phase-locked loop for a receive carrier recovery or a phase lock recovery demodulates an input received...
5450033 Frequency demodulation circuit  
A frequency demodulation circuit having an improved detection sensitivity is provided by forming an all-pass equalizer in a Quadrature-type demodulator capable of allowing a band covering at least...
5341107 FM quadrature demodulator with two phase comparison circuits  
FM quadrature demodulator having in-phase and quadrature terminals for applying a pair of FM-modulated signals in a mutual phase quadrature thereto, having a modulation signal which is...
5341106 Amplitude locked loop circuits  
There is described an electronic circuit which operates an Amplitude Locked Loop. The circuit comprises a voltage controlled amplifier, a modulus detector and an integrator combined in a feedback...
5315262 Demodulator alignment method and apparatus  
A demodulator alignment method and apparatus (400) employs an alignment signal generator (401-405) to generate an alignment signal (417) in response to a modulation reference signal (413). The...
5289502 Signal processing device  
A signal processing device for processing an information signal, comprises a frequency modulator arranged to receive the information signal, to frequency-modulate the received information signal...
5157343 Electronic arrangement for receiving a modulated carrier signal  
Electronic receive arrangement for receiving a modulated carrier signal, which arrangement comprises a mixer/demodulator driven with the carrier frequency fc, at least one adder included in a...
5109532 Elimination of phase noise and drift incident to up and down conversion in a broadcast communication system  
Phase noise and drift in a broadcast communication system caused by imperfections in transmitter and receiver local oscillators used for up and down conversion of a frequency or phase modulated...

Matches 1 - 50 out of 96 1 2 >