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| Number | Title | Issue Date |
| 8189720 | Blind frequency-offset estimation for temporally and/or spatially correlated signal An iterative, blind, frequency-offset estimation process that does not require any training signal or demodulated information symbols is disclosed. Receivers embodying the disclosed processes can produce periodic frequency-offset estimates, without running computati... | 05/29/2012 |
| 8184751 | Integrated interference cancellation system architecture with distortion correction A system and associated method is provided for improved rejection of an interfering signal coupled from a transmission antenna into a local receive antenna in the presence of local multipath. A system of the invention includes a common feedback junction, (i.e., a si... | 05/22/2012 |
| 8175199 | Wireless receiver A wireless receiver realizes multi-band and multi-mode operations while reducing power consumption of a local oscillator. The receiver includes the local oscillator for discontinuously changing a band of a local oscillation signal corresponding to a frequency band o... | 05/08/2012 |
| 8165249 | Apparatus and method for estimating and compensating time offset and/or carrier frequency offset in MIMO system based OFDM/OFDMA The present invention relates to an apparatus and method for estimating and compensating for a time offset and a carrier frequency offset in a Multiple Input Multiple Output (MIMO) communication system that supports Orthogonal Frequency Division Multiplexing (OFDM) ... | 04/24/2012 |
| 8160185 | Apparatus for synchronizing OFDM signal using open-loop frequency synchronization method and frequency offset estimation scheme using the apparatus There are provided an apparatus for synchronizing an OFDM signal using an open-loop frequency synchronization method, which can estimate and compensate for various types of frequency errors generated in a frequency modulation broadcasting/communication system to whi... | 04/17/2012 |
| 8155253 | Apparatus and method for automatically changing broadcast channel for mobile communication terminal adapted to receive digital multimedia broadcast Disclosed is an apparatus and a method for automatically changing the broadcast channel for a mobile communication terminal adapted to receive digital multimedia broadcasts. The apparatus includes a memory unit for storing an adjacent area database and an area-wise ... | 04/10/2012 |
| 8155252 | Frequency offset correction A frequency error correction scheme applicable in a receiver of a mobile telecommunication system is presented. The present frequency error correction scheme is carried out in a time domain after an equalization process. The present frequency error correction scheme... | 04/10/2012 |
| 8149963 | Start-up automatic frequency control (AFC) method and apparatus A method and apparatus for use in connection with wireless communication to adjust the frequency of an oscillator to synchronize with a received signal by correlating a synchronization code channel with training sequences to estimate relative offsets which are emplo... | 04/03/2012 |
| 8144821 | CDMA frequency acquisition using a simplified crystal oscillator that is not temperature compensated CDMA code channels are acquired using a crystal oscillator that is not temperature compensated and that generates a tuning signal with relatively large frequency error (e.g., +/−5 ppm). Channel acquisition is first attempted at no offset from a start frequency tha... | 03/27/2012 |
| 8135097 | Sequential tracking and offline demodulation in receiver An apparatus and method for tracking a desired signal by sequentially tracking the desired signal with a variable integration time, performing automatic frequency control of the desired signal, and demodulating the desired signal using offline software. In one aspec... | 03/13/2012 |
| 8111788 | Apparatus for estimating and correcting baseband frequency error in a receiver An apparatus for estimating and correcting baseband frequency error in a receiver is disclosed. An equalizer performs equalization on a sample data stream and generates filter tap values based on the equalization. An estimated frequency error signal is generated bas... | 02/07/2012 |
| 8085885 | Voice and data exchange over a packet based network with timing recovery A signal processing system which discriminates between voice signals and data signals modulated by a voiceband carrier. The signal processing system includes a voice exchange, a data exchange and a call discriminator. The voice exchange is capable of exchanging voic... | 12/27/2011 |
| 8077814 | Preamble acquisition without second order timing loops A clock is adjusted by obtaining a first plurality of samples and a second plurality of samples associated with a preamble portion of a data packet. The first plurality of samples and the second plurality of samples are sampled using a clock. A first intermediate va... | 12/13/2011 |
| 8068567 | Phase and frequency control of an ODFM receiver by means of pilot phase-value estimation A common phase value of pilot subcarriers of a received data symbol (n) is estimated and used for correcting the phase of all subcarriers of the data symbol, wherein, with a time-variant frequency of the local oscillator (VCO), the estimated noisy phase values (Ψ | 11/29/2011 |
| 8068568 | Method and system for a sliding window phase estimator for wideband code division multiple access (WCDMA) automatic frequency correction Aspects of a method and system for a sliding window phase estimator for wideband code division multiple access (WCDMA) automatic frequency correction are presented. Aspects of the system may include one or more circuits that enable adjustment of a current demodulati... | 11/29/2011 |
| 8064553 | Coarse frequency offset estimation in ISDB receivers A method of estimating a coarse frequency offset in a receiver includes providing at least one candidate frequency offset in Orthogonal Frequency-Division Multiplexing (OFDM) symbols having transmission and multiplexing configuration control (TMCC) bins and auxiliar... | 11/22/2011 |
| 8059766 | Communications device and related method with reduced false detects during start of message bit correlation A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and process... | 11/15/2011 |
| 8059767 | Communications device and related method that detects symbol timing A communications device includes a signal input for receiving signals such as a binary phase shift keyed (BPSK) communications signal having a repeated preamble bit or symbol pattern. A modem processes the communications signal and includes a demodulator and process... | 11/15/2011 |
| 8054920 | Communications device and related method with improved acquisition estimates of frequency offset and phase error A repeated preamble bit or symbol pattern such as for a binary phase shift keyed (BPSK) communications signal is received within a modem. An initial frequency offset and phase error estimate is generated by processing a Fast Fourier Transform (FFT) that detects the ... | 11/08/2011 |
| 8050365 | Radio communication device A radio communication device performs baseband processing by subjecting a received signal to an AD conversion at a predetermined sampling frequency and converting a digital signal resulting from the AD conversion into a baseband signal by frequency conversion. The d... | 11/01/2011 |
| 8050366 | Device and method for compensating timing offset A method and OFDM receiver for estimating timing offset are provided. The method includes receiving OFDM data to calculate frequency offset between a transmitter carrier frequency and a receiver carrier frequency, determining first timing offset based on the frequen... | 11/01/2011 |
| 8045656 | Weather band radio having digital frequency control In one embodiment, the present invention includes a digital mixer to receive and digitally mix incoming weather band radio data with a control signal, a digital demodulator to demodulate the data to obtain a demodulated signal, and a digital feedback loop coupled be... | 10/25/2011 |
| 8045658 | Reception apparatus, reception method and program A reception apparatus includes: an extraction section; a transmission line characteristic estimation section; an estimation section; a frequency shift amount production section; a control section; an addition section; a first frequency shifting section; a second fre... | 10/25/2011 |
| 8045657 | Enhanced carrier frequency offset estimator A method is provided for estimating a frequency offset in a carrier signal caused by the Doppler effect. The method determines a frequency offset estimate by utilizing a multi stage estimation scheme. More specifically, the method determines the frequency offset est... | 10/25/2011 |
| 8040982 | Phase-adjusted channel estimation for frequency division multiplexed channels The disclosed technology relates to estimating the frequency response of a frequency division multiplexed (FDM) channel. In accordance with one aspect of the invention, a channel estimation circuit of a receiver can compute initial estimates of the frequency respons... | 10/18/2011 |
| 8031818 | Method and apparatus for fine frequency synchronization in wireless broadband (WiBro) system without using global positioning system (GPS) receiver Provided is a fine frequency synchronization method of a WiBro system, and particularly, a fine frequency synchronization method which measures a spread degree of a received signal of an adjacent subcarrier using orthogonality of PN sequences and thereby estimates a... | 10/04/2011 |
| 8027414 | Carrier frequency recovering apparatus using phase shift and method thereof Provided is a carrier frequency recovering apparatus and method based on phase shift. The carrier frequency recovering apparatus can recover carrier frequency based on phase shift caused by a frequency offset to thereby perform demodulation without deterioration, no... | 09/27/2011 |
| 8023596 | Doppler tracking method and device for a wide band modem A system and method for estimating and tracking the frequency offset for a transmission system whose bandwidth is not insignificant with respect to the central frequency, the system transmitting a waveform including fixed carriers whose level is substantially greate... | 09/20/2011 |
| 8023597 | Methods for selecting a coarse frequency offset estimation for an orthogonal frequency division multiplexing modulated signal The present invention provides methods for selecting the coarse frequency offset estimation in an orthogonal frequency division multiplexing system that may include: searching within a predefined subset for a set of frequency offset candidates; selectively searching... | 09/20/2011 |
| 8014476 | Wireless device with a non-compensated crystal oscillator A wireless device achieves good performance using a crystal oscillator that is not compensated for temperature. The crystal oscillator provides a reference signal having a temperature dependent frequency error. A control unit estimates the frequency error (e.g., bas... | 09/06/2011 |
| 8014475 | Method and arrangement for automatic frequency control in a communication system An arrangement (900), method and unit for AFC in a communication system (100) having: a frequency estimator (980) producing a decision-directed frequency estimate from a received signal; and an AFC loop receiving the decision-directed frequency ... | 09/06/2011 |
| 8009775 | Automatic frequency control for a wireless communication system with multiple subcarriers Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial freque... | 08/30/2011 |
| 7986754 | Method and/or apparatus for stabilizing the frequency of digitally synthesized waveforms An apparatus including a first circuit, a second circuit, a third circuit, and a fourth circuit. The first circuit may be configured to generate a demodulated signal in response to a modulated signal and a seed value selected in response to a first control signal. T... | 07/26/2011 |
| 7945004 | Method and apparatus for detecting a frequency band and mode of operation A method and apparatus for detecting a frequency band and mode of operation using recursive sampling and narrowing down is disclosed. The method comprises sampling (215) by a multi-mode wireless communication device, a broad operational frequency spectrum at ... | 05/17/2011 |
| 7945003 | Method and apparatus for detecting offset in an orthogonal frequency division multiplexing system Disclosed is a method for detecting a frequency offset in an Orthogonal Frequency Division Multiplexing (OFDM) system. The method includes determining a first frequency index based on autocorrelation values calculated according to a frequency index for a pilot signa... | 05/17/2011 |
| 7929648 | Clock error detection apparatus and method An error detection apparatus and method compares a first hardwired value such as a first clock threshold, and a second hardwired value such as a second clock threshold, and generates an indication that there is an error in a clock signal based on a comparison of the... | 04/19/2011 |
| 7924954 | Frequency correction A frequency correction circuit that gives plural frequency offsets to a received radio signal in order to correct a frequency error of the radio signal, demodulates the radio signal, combines an arbitrary number of demodulation signals as combined demodulation signa... | 04/12/2011 |
| 7920658 | Efficient method to compute one shot frequency estimate Systems and methods are provided for efficiently determining frequency estimates in a forward link only wireless receiver. In one embodiment, a method is provided to compute a one shot frequency estimate. The method includes representing an arc tangent function in a... | 04/05/2011 |
| 7920659 | Wireless communication apparatus and wireless communication method A wireless communication apparatus capable of enhancing the transmission efficiency, while maintaining a good BER characteristic. In this apparatus, a setting part (13) sets, based on the maximum delay amount of a delayed wave and also based on the expansion ... | 04/05/2011 |
| 7912157 | Symmetric pilot processing for robust timing offset and frequency offset estimation in ISDB-T and ISDB-TSB receivers Timing and frequency offset processing in sub-carriers is performed in an Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) receiver system. Sub-carriers are divided into two sub-sets, where the sub-sets contain an equal number of sub-carriers. Subsequen... | 03/22/2011 |
