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7623595 Digital technique of compensating mismatches between in phase and quadrature channels  
Methods and systems for filtering an input signal include receiving a first demodulated signal produced by multiplying a first generated signal with a received input signal, receiving a second...
7620124 Direct conversion receiver and receiving method  
A receiving method and a direct conversion receiver are provided. The receiver comprises a mixer ( 308 ) for mixing a received signal into a base band signal comprising I and Q branches, and an A/D...
7602862 Mixing module and methods for use therewith  
A mixing module includes a plurality of switched sample modules operably for generating a corresponding plurality of samples of an analog input signal in response to a control signal. A control...
7599627 Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation  
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted...
7587010 Complex filter circuit and receiver circuit  
A pseudo-image signal producing section produces a pseudo-image signal imitating an actual image signal. An amplitude detection section detects the amplitude of the pseudo-image signal having...
7580480 Demodulation method using soft decision for quadrature amplitude modulation and apparatus thereof  
In a soft decision method for demodulation of a received square QAM (Quadrature Amplitude Modulation) signal, the processing speed is improved, and the manufacturing expense is reduced, by using...
7567626 Radio receiver for the reception of data bursts which are modulated with two modulation types  
The invention relates to a radio receiver for the reception of a data burst which is transmitted by a transmitter, in which case the data burst includes a first section which has been modulated...
7564926 Method and device for calculating zero-crossing reference sequences for signal detection of angle-modulated signals based on zero crossings of the received signal  
A method for calculating zero-crossing reference sequences ({t i }) for the data detection of a sequence of zero crossings ({{circumflex over (t)} i }) of a received signal is disclosed. The data...
7564782 Transmission format, communication control apparatus and method, recording medium, and program  
JPEG-2000 data is formatted into RTP packets for transmission through the Internet. A priority field is provided in the format, and a value indicating the importance of a code stream included in a...
7551694 Limiter based analog demodulator  
A limiter based analog demodulator includes a power amplifier receiving a base-band signal and a local clock operating at the base-band frequency. A first multiplier receives an output from the...
7546088 Method and apparatus for blending an audio signal in an in-band on-channel radio system  
A method for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of the digital audio broadcast signal, the method comprising the steps of...
7541966 Apparatus and method for demodulating a modulated signal  
An apparatus for demodulating a modulated signal comprises an analog to digital converter ( 2, 12 ) for converting an analog modulated input signal to a digital signal. The analog to digital...
7486717 Method and device for demodulating Galileo alternate binary offset carrier (Alt-BOC) signals  
A method for demodulating alternate binary offset carrier signals includes at least two subcarriers, each having an in-phase and a quadrature component modulated by pseudo-random codes. The...
7474713 System and method for demodulating multiple QAM signals  
A system and method demodulate N QAM signals (N being a positive integer equal to or greater than 1) substantially simultaneously using, for example, one or two oscillators, regardless of how many...
7471745 Method and apparatus for channel quality metric generation within a packet-based multicarrier modulation communication system  
A communication system disclosed herein includes a channel quality estimation module that determines the channel quality metric utilizing the preamble portion of the packet only. Data, in such a...
7466747 Method and apparatus for wireless data transfer  
A method and apparatus for wirelessly transmitting data between two devices ( 101. 102 ) is provided herein. During data transmission, a data and a strobe signal are transmitted simultaneously on...
7453962 Adaptive frequency control apparatus and method thereof  
The adaptive frequency control apparatus includes: a frequency downstreamer for converting the frequency of the radio frequency signal to a frequency of a defined band according to a reference...
7437137 Mixer system  
A mixer system includes a multi-phase signal generator, a mixer, and a mixer control circuit. The multi-phase signal generator generates a plurality of mixer input signals, where each has a...
7426246 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...
7424066 Receiver structures for selectable direct conversion and low intermediate frequency operational modes  
Receiver embodiments are disclosed that can process a wide range of transmission bandwidths over a wide range of transmission frequencies and provide reduced converter sampling rates, filter...
7379723 Local oscillator and mixer for transceiver  
In one embodiment, a local oscillator and mixer architecture may include a frequency divider having I and Q channel master storage elements formed of devices of a first size, and I and Q channel...
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...
7336731 Demodulator with phase-adjusting function  
A demodulator with a phase-adjusting function including a detector including a delay detector delaying an input signal in delaying stages using a first clock obtained by frequency-dividing a...
7336717 Receiver circuit, in particular for a mobile radio  
A radio receiver with a low intermediate frequency has a first mixer stage that can be fed with a modulated input signal and at whose output a complex intermediate frequency signal can be derived....
7327806 System/method for receiving ASK and FSK signals using a single RF receiver  
A system utilizes a single receiver to simultaneously receive and demodulate both amplitude shift keying (ASK) messages and frequency shift keying (FSK) messages. The single receiver is used to...
7327776 Time domain spreading method and apparatus for a UWB receiver comprising fast fourier transform and exchange of real and imaginary complex signal components  
A time domain spreading method and apparatus for a UWB receiver are provided. Wherein, a series of received symbol signals are received by the UWB receiver, and transformed by the fast Fourier...
7317768 Demodulator and demodulation method for demodulating received signals  
The invention relates to a demodulator and also a demodulation method and enables a reliable demodulation even when the intermediate frequency range overlaps the range of the data frequencies of...
7313206 Modified branch metrics for processing soft decisions to account for phase noise impact on cluster variance  
Modified branch metrics for processing bit-soft decisions to account for phase noise impact on cluster variance (CV). The present invention is able to partition a modulation scheme's constellation...
7313204 Method and device for transmitting and identifying a modulation type in digital communication systems by way of a phase rotation factor applied to a training sequence  
Data symbols in the training sequence are rotated at the transmitter end through a phase rotation factor which is specific for a given modulation type that is used. For blind modulation detection...
7313099 Phase system rotation for power estimation  
A receiver, an integrated circuit chip and a method are provided for estimating the power of a digitally modulated signal received by the receiver in a communication system. The method comprises...
7280618 Digital baseband receiver including a high pass filter compensation module for suppressing group delay variation distortion incurred due to analog high pass filter deficiencies  
A digital baseband (DBB) radio frequency (RF) receiver includes a digital high pass filter compensation (HPFC) module used to suppress group delay variation distortion caused by using low cost...
7277501 Data receiving device  
A data receiving device is provided enabling a reduction in the time required for extracting a partial band signal, and capable of being easily made in a simple structure as an LSI device without...
7272197 Device for recovering carrier  
Device for recovering a carrier including a first signal converter for multiplying a complex carrier caused by a phase error to a digitized passband VSB signal, to provide a baseband VSB signal, a...
7266162 Carrier frequency offset estimator for OFDM systems  
A frequency offset estimator is employed that estimates the frequency offset in signal frames that include only binary Phase-Shift Keying (BPSK) carriers in OFDM systems. Specifically, the offset...
7266161 Efficient method and apparatus for parallel processing for use with high-speed single-bit sampling  
An apparatus and method provides efficient parallel processing for use with a single-bit sampler that provides single-bit samples at a high sample rate. A serial-to-parallel converter converts the...
7248649 Digital baseband receiver including a time domain compensation module for suppressing group delay variation distortion incurred due to analog low pass filter deficiencies  
A digital baseband (DBB) radio frequency (RF) receiver used for receiving and processing a wireless communication signal. The DBB receiver includes a demodulator, first and second analog low pass...
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...
7231266 Digital control device and program  
A digital control device for tracking a sine wave according to the present invention has a compensator, a control object and a feedback gain. An input into the compensator is a signal obtained by...
7231002 Apparatus for recovering carrier  
An apparatus and method of detecting whether the carrier frequency is locked for confirming recovering carrier is normally performed is disclosed. The apparatus includes a lock detector for judging...
7227912 Receiver with mirror frequency suppression  
Receiver comprising an RF front end circuit for a selection and conversion of an RF input signal into a pair of quadrature IF (intermediate frequency) signals being supplied through in-phase and...
7224717 System and method for cross correlation receiver  
A system and method for detecting signals. A system includes a first antenna configured to receive at least a first input signal and generate at least a first received signal, and a second antenna...
7203253 Method and apparatus of cross-correlation  
Briefly, a method and apparatus to calculate cross-correlation values of complex binary sequences are provided. The apparatus may include a transformation unit and a cross-correlator. The...
7197090 Adaptive decision regions and metrics  
An improved decoding technique useful for hard decision decoding, such as quadrature phase shift keying (PSK) and quadrature amplitude modulation (QAM), as well as soft-decision techniques, such as...
7190939 Time division IQ channel direct conversion receiver and method therefor  
A direct conversion receiver includes a local oscillator for generating a sinusoid, a mixer for receiving an incoming signal and for mixing the incoming signal with the sinusoid, an...
7184494 Regenerated data signal generation apparatus  
A regenerated data signal generation circuit includes a receiving circuit, first and second binarization circuits and a signal preparation circuit. The receiving circuit receives a modulated signal...
7173982 Method and circuit for digitally correcting the frequency of a signal  
A method and a circuit for the digital correction of a frequency of a signal, especially for use in a transmitter/receiver circuit include rotating a signal “pointer” (i0, q0) using a CORDIC...
7164738 Signal canceling method and device  
In a signal cancellation method and device which can cancel input signals quickly and reliably (stably), an input signal is split into a first and second signal. The second signal is split into...
7162000 Delay locked loop synthesizer with multiple outputs and digital modulation  
A delay locked loop circuit ( 200 ) in which multiple outputs are produced. A single delay line ( 24 ) is shared among multiple tap selection circuits ( 256 A, 265 B, 265 C). Fixed phase shifts (...
7120415 Radio receiver  
A radio receiver is configurable to operate in both low-IF and zero-IF modes with maximum re-use of of analogue and digital circuitry between modes. The receiver comprises a quadrature...
7120202 Wireless communication apparatus  
In a wireless communication apparatus which has the functions of both ASK modulation and QPSK modulation, which can be manufactured at a low cost, and which is small in size, an output terminal of...
Matches 1 - 50 out of 164 1 2 3 4 >