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6714603 |
Asynchronous timing for interpolated timing recovery
A quotient (y 2 −y 0 )/(y 3 −y 1 ) is generated by circuitry where Y k are asynchronous samples from a sequence of asynchronous samples, the quotient (y 2 −y 0 )/(y 3 −y 1 ) is compared to...
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6714601 |
Method in digital quadrature modulator and demodulator, and digital quadrature modulator and demodulator
Method measures imperfections in the digital quadrature demodulator from the amplitude of the output signal of the demodulator quadrature mixer, i.e. from the amplitude of a vector formed by the I...
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6714596 |
BS digital broadcast receiver
A BS digital broadcast receiver having no 8PSK-demapper and a less number of delay circuits for Trellis encoding. A QPSK baseband signal based upon a reception signal point position of an...
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6707862 |
Predictive data rate control in wireless transmitters
A wireless transmitter includes a data rate controller operating to predictively determine a traffic channel data rate for a frame of data stream using a previous data rate, transmitted bit energy...
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6707863 |
Baseband signal carrier recovery of a suppressed carrier modulation signal
A multidetector ( 40 ) circuit for use in a plurality of carrier recovery systems ( 10, 70 ) for recovery for a suppressed carrier modulated signal. The multidetector ( 40 ) receives demodulated,...
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6704374 |
Local oscillator frequency correction in an orthogonal frequency division multiplexing system
An Orthogonal Frequency Division Multiplexing (OFDM) receiver that detects and corrects a carrier frequency offset of a received signal is provided. The OFDM receiver samples an incoming signal in...
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6700943 |
Digital bit synchronizer for low transition densities
An apparatus and method for synchronizing a derived bit clock with a transmit bit clock of a transmitted data signal is disclosed. The present invention uses a divide-only direct digital...
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6700940 |
Carrier reproduction circuit
A carrier reproduction circuit which can perform stable carrier reproduction even when reception takes place with low C/N values is provided. The reception phase of the demodulated known-pattern...
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6697609 |
Carrier reproducing apparatus and method of the same
A carrier reproducing apparatus and method enabling stable operation even at a low S/N, wherein, when phase signals are locked and exceed a predetermined value, a tracking circuit generates a...
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6697439 |
Carrier acquisition in a DC/MA system
Carrier wave frequency is quickly acquired without burdensome MIPs requirements by limiting the spectral analysis of the incoming channel to the expected band edges. The right and left band edges...
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6697440 |
Demodulator of receiver
A small scale circuit can be realized. A timing circuit 30 detects a burst symbol signal period from outputs I and Q of a demodulating circuit 1 A for orthogonally detecting a received signal...
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6693978 |
Carrier reproducing circuit
A carrier reproducing circuit capable of reproducing a carrier quickly, wherein: a signal point arrangement converting circuit ( 14 ) detects the signal point arrangement of a demodulating baseband...
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6693979 |
Adaptive smoothing system for fading communication channels
An adaptive smoother includes a phase lock loop, a scintillation amplitude estimator and a fixed delay smoother operating on amplitude estimates for providing improved phase and/or code delay...
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6690747 |
Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing
A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including:...
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6687309 |
System for estimating carrier frequencies of quadrature amplitude modulated signals having high symbol rates
A first system includes a converter, complex signal generator, exponentiator, FFT module and processor to estimate carrier frequency of a high symbol rate quadrature amplutide modulated (QAM)...
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6687315 |
Single chip VLSI implementation of a digital receiver employing orthogonal frequency division multiplexing
The invention provides a single chip implementation of a digital receiver for multicarrier signals that are transmitted by orthogonal frequency division multiplexing. Improved channel estimation...
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6683493 |
Timing reproducing device and demodulator
In-phase and orthogonal components of a base band signal having a preamble symbol are squared to obtain squared in-phase orthogonal components. Amount of correlation is obtained between the squared...
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6683920 |
Dual-loop system and method for frequency acquisition and tracking
A dual loop system for the acquisition and tracking of a carrier signal is presented. The acquisition loop uses a bang-bang phase detector which permits the carrier to be acquired without a clock...
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6680653 |
VCO tuning curve compensated charge pump current synthesizer
A system provided for controlling an output frequency of a voltage controlled oscillator relative to a reference frequency. A method includes the steps of detecting a phase error between a divided...
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6680991 |
Detection of frequency differences between signals
A lock detector is described for detecting a difference between the frequencies of a first and a second input signal. The lock detector includes first and second beat generators configured to...
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6680970 |
Statistical methods and systems for data rate detection for multi-speed embedded clock serial receivers
Methods and systems for data rate detection for multi-speed embedded clock serial receivers are described. In one embodiment, a method of determining a data rate of a high speed serially...
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6674814 |
Frequency error estimating apparatus and a frequency error estimating method
A frequency error estimating apparatus for estimating a frequency error between a local oscillation frequency and a carrier frequency of a received signal in a receiver includes a frequency error...
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6671331 |
Carrier detecting circuit for detecting the level of a received signal and communication apparatus
An RSSI block cumulating circuit block-cumulates an RSSI signal that has been A/D converted and calculates an RSSI signal in a low level. An RSSI level raising circuit raises the level of the RSSI...
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6671339 |
Lock detecting apparatus and method for multimedia digital broadcasting receiver
A lock detecting apparatus for a multimedia digital broadcasting receiver is disclosed. The present invention is a general purpose lock detecting apparatus applicable to a channel equalizer as well...
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6668025 |
Tuning demodulator for digitally modulated RF signals
A tuning demodulator for digitally modulated signals tunes and detects a desired RF signal by an I/Q detection circuit and a tuning oscillation circuit composed of a PLL synthesizer having an...
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6665355 |
Method and apparatus for pilot-aided carrier acquisition of vestigial sideband signal
An inexpensive synchronous detection module is disclosed for a sideband signal receiver that provides for flexibility in design of the tuner. The detection module is adaptable to detection of upper...
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6661852 |
Apparatus and method for quadrature tuner error correction
An apparatus for quadrature tuner error correction includes an offset correction circuit adapted to receive a digital in-phase signal and a digital quadrature signal from a quadrature tuner. The...
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6658042 |
Method and apparatus for time tracking a signal using hardware and software
A method of providing time tracking between a first signal and a second signal in a communication device. In one embodiment, a first signal is generated by the communication device and a second...
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6650699 |
Methods and apparatus for timing recovery from a sampled and equalized data signal
Methods and apparatus for use in a communication channel receiver for generating a sampling phase error signal for adjustment of a sampling clock signal associated with the receiver are provided....
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6643340 |
Carrier phase derived symbol timing
A method and apparatus for symbol timing initialization in a multi-carrier receiver. The method uses phase measurements from a plurality of the individual carriers to make an initial determination...
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6643334 |
Bandpass tracker for DTV receiver, with VSB I-F signal filtered for more symmetrical AFPC Loop response
Digital radio receivers for digital television signals often employ bandpass trackers in which the bandwidth of the automatic-frequency-and-phase-control (AFPC) loop is determined in the baseband...
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6639909 |
Receiver having functions for cancelling DC offset and measuring carrier detection threshold value, and control method thereof
An improved system and method for canceling a DC offset and measuring a carrier detection threshold value. A control circuit provides a signal based upon a frame synchronizing signal for shutting...
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6636570 |
Phase detection apparatus for compensating phase rotation error
A phase detection apparatus for receiving an I-channel signal an a Q-channel signal as a received signal modulated with a quadrature phase-shift keying and compensating a phase rotation error of...
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6631174 |
Automatic frequency control apparatus
A transmitting side periodically inserts a known signal consisting of successive N P symbols into an information signal consisting of (N F −N P ) symbols and transmits the N F symbol signal....
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6628926 |
Method for automatic frequency control
A radio signal transmitted from a transmitter to a receiver of a mobile communications system, such as the GSM system, often suffers from a phenomenon known as frequency offset by which the...
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6611570 |
Programmable digital intermediate frequency transceiver
A monolithic CMOS programmable digital intermediate frequency receiver includes a programmable memory, a clock generator, a sigma delta converter, a digital downconverter, and a decimation filter...
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6608869 |
Dual-carrier heterodyne for separating orthogonal components of complex amplitude-modulation signals
A method for receiving a modulated carrier wave with asymmetrical upper and lower sidebands, which carrier wave may be suppressed, is described. A first down-converter in the receiver heterodynes...
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6603803 |
Global positioning system receiver for monitoring the satellite transmissions and for reducing the effects of multipath error on coded signals and carrier phase measurements
A Global Positioning System receiver includes an intermediate frequency (IF) processor configured to downconvert broadcast signal to generate a first channel signal which is further downconverted...
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6603821 |
Wireless communication terminal capable of correctly specifying position of burst and having small frequency error of recovered carrier
A power calculator calculates the power of an input signal in accordance with a component of an input received signal. A comparator asserts an unmodulated signal detection signal when the power...
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6600793 |
Minimal overhead early late timing recovery
A timing recovery circuit and method which determines whether a sample point in a generated bit sequence is early or late based on binary logic which is already available used in generating a bit...
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6600778 |
Method and apparatus for VSB symbol sync recovery
The HDTV receiver system includes a pre-detection processor to filter a digitized signal before detecting the sync signal. The pre-detection processor eliminates the effects of ghost signal which...
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6597754 |
Compensation of frequency pulling in a time-division duplexing transceiver
A carrier-recovery loop for compensating frequency pulling in TDD and TDMA radio transceivers. The digital carrier-recovery loop includes a signal input, a digitally-controlled oscillator (DCO), a...
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6597725 |
Carrier phase follower and frequency hopping receiver
A carrier phase follower is provided that can follow the carrier phase even when the carrier phase angle varies with respect to a reference frequency signal. Demodulation data is decided, without...
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6594328 |
Method and apparatus for facilitating an estimation of a carrier frequency error in a receiver of a wireless communication system
A receiver ( 200 ) receives ( 402 ) a first signal including a sync portion ( 308 ) having a carrier acquisition segment ( 302 ) and a timing synchronization pattern ( 304 ), and a processing...
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6594320 |
Orthogonal Frequency Division Multiplexed (OFDM) carrier acquisition method
In all wireless systems, the first operation that must take place at the receiver is the acquisition of the carrier and timing. OFDM systems are particularly sensitive to carrier offsets since...
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6590942 |
Least squares phase fit as frequency estimate
A method and apparatus for estimating the frequency of a carrier signal associated with a modulated signal carrying digital data in which the signal is demodulated by a demodulator that includes a...
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6587503 |
Information processing apparatus and method
An information processing apparatus in which an eye center measuring unit determines a code judgment point from a peak timing signal supplied from a timing signal generation circuit and an...
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6587157 |
Storing digital video broadcast signals
In order to reduce memory requirements in a chip for demodulating digital video broadcast signals, symbol data values stored for a channel equalisation process have their scattered pilots removed,...
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6587523 |
Radio signal receiving apparatus and a method of radio signal reception
A radio signal receiving apparatus and a method of radio signal receiving for improving the receiving characteristic by limit the excessive compensation in the AFC circuit are realized. The base...
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6580770 |
Information regenerating apparatus and information regenerating method
Input data is converted into digital data in a A/D converter in synchronization with a regenerated clock, a zero-cross detecting signal of the digital data is detected in a zero-cross detector, a...
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