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| Number | Title | Issue Date |
| 8099068 | Downconversion strategies for reducing interference in wanted signals A receiver for isolating a wanted signal in a received signal, the receiver comprising a downconverter for downconverting the received signal in frequency to produce a downconverted signal, a filter with a passband intended for isolating that part of the spectrum of... | 01/17/2012 |
| 8090333 | Receiving apparatus, receiving method, and program A receiving apparatus includes: a demodulating unit which demodulates an IF signal obtained by subjecting a received RF signal to frequency conversion; a detecting unit which detects a carrier wave frequency error contained in the IF signal; a frequency control unit... | 01/03/2012 |
| 8081939 | Correlation-driven adaptation of frequency control for a RF receiver device A frequency-control unit is used for controlling an external controllable reference-frequency source. The frequency-control unit includes a filter unit with a controllable filter parameter, which is configured to derive, using the filter parameter, from a frequency-... | 12/20/2011 |
| 7986929 | Providing channel filtering in an automatic frequency control path In one embodiment, the present invention includes a method for filtering an incoming signal in a channel filter of an automatic frequency control (AFC) loop to obtain a filtered incoming signal, generating a frequency offset from the filtered incoming signal in the ... | 07/26/2011 |
| 7865158 | Method and apparatus for automatically correcting receiver oscillator frequency A method and apparatus for automatically correcting the frequency of a local oscillator of a receiver. A primary common pilot channel (CPICH) code sequence is generated by a CPICH code generator based on a reference cell identification signal and a frame start signa... | 01/04/2011 |
| 7801501 | Method for performing a frequency correction of a wireless device A method of performing a frequency correction of a radio module. Multiple samples of frequency data during a quiescent portion of the base station transmission is taken to estimate the amount of frequency correction needed. An embodiment applies the frequency data t... | 09/21/2010 |
| 7725090 | Method and apparatus for automatic frequency correction A technique is provided for automatic frequency offset correction in a wireless communication system. After demodulating and decoding a received signal in a receiver, channel estimation is also performed. The technique further includes re-encoding and re-modulating ... | 05/25/2010 |
| 7433657 | Apparatus and method for dynamically clocking a loop filter in a digital communications device A transmitter has a signal generator, an amplifier, a detection circuit, a comparison circuit, a loop filter, and an adjustable clock. The signal generator produces a signal. The signal is produced with a first frequency characteristic and contains frequency-related... | 10/07/2008 |
| 7424278 | Low IF mixer with improved selectivity performance A low IF mixer and method for down-converting a signal at a desired frequency are disclosed with improved selectivity performance. The energy of sidebands on each side of the desired frequency is evaluated; and a local oscillator frequency is selected based on the e... | 09/09/2008 |
| 7358897 | Apparatus, methods and computer program products for GPS signal acquisition using an adaptive search engine A GPS receiver includes a digital signal processor (DSP) configured to receive a carrier-modulated signal and to provide an adaptive GPS search engine operative to search the carrier-modulated signal for GPS signals over a variable number of carrier timing hypothese... | 04/15/2008 |
| 7336742 | Frequency error correction device and OFDM receiver with the device A frequency error correction device for an OFDM receiver is proposed. The receiver receives an OFDM signal with a preamble section and a payload section including pilot carriers. The frequency error correction device includes a first frequency correction unit for co... | 02/26/2008 |
| 7336697 | Code division multiple access mobile communication system A code division multiple access (CDMA) mobile communication system with improvements to permit stable reception with a minimum of bit error. The system includes a base station and a mobile station for communicating with the base station. The mobile station includes ... | 02/26/2008 |
| 7333573 | Radio communication apparatus and method having automatic frequency control function A method for use in an apparatus for frequency error detection and automatic frequency control detects a frequency error by utilizing known symbols other than a data signal contained in an input signal. At least two known symbols located at positions somewhat distan... | 02/19/2008 |
| 7327406 | Methods and apparatus for implementing a receiver on a monolithic integrated circuit A monolithic integrated circuit includes a tuner and a SAW filter function. The tuner receives a radio frequency (RF) television signal that has a range of fundamental frequencies from 55 mega hertz (Mhz) to 880 Mhz. The tuner down converts the RF television signal ... | 02/05/2008 |
| 7319822 | System and method of space-time equalization to mitigate effects of fading and scintillation for wireless communication A system and method is disclosed for mitigating the scintillation and fading effects of baseband wireless, radio frequency wireless, optical wireless and satellite communication links. The system uses a space-time channel model to derive an optimal processing archit... | 01/15/2008 |
| 7308238 | Automatic frequency controlling apparatus and method of mobile communication terminal An apparatus and method for performing automatic frequency control of a mobile communication terminal detects a current peak position value from a downlink pilot signal and then calculates a difference value (dev) between the current peak position and a previous pea... | 12/11/2007 |
| 7305219 | Portable radio terminal and AFC control method A portable radio terminal for realizing automatic frequency control (AFC) for automatically controlling the oscillation frequency of an oscillator includes a unit for intermittently performing AFC operation, and a unit for shortening an AFC operation stop period whe... | 12/04/2007 |
| 7299023 | Method and apparatus for automatic frequency correction with a frequency error signal generated by block correlation of baseband samples with a known code sequence The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code sequence known to the apparatus. The apparatus downconverts the carrier s... | 11/20/2007 |
| 7295822 | Radio wave receiver, radio-controlled timepiece and tuning capacitance setting method A radio wave receiver for receiving radio waves having a predetermined frequency, the receiver comprises an antenna, an variable capacitor connected to the antenna, a memory, and a controller which determines an optimum capacitance of the variable capacitor with whi... | 11/13/2007 |
| 7286613 | Process and device for modulating a carrier with amplitude and phase error compensation The invention relates to processes and devices which make it possible to directly modulate an RF carrier with a quadrature signal. It consists in filtering (504) this quadrature signal around zero so as to introduce alternately (507, 508) on each of th... | 10/23/2007 |
| 7286811 | Local oscillator apparatus and method A direct conversion satellite tuner is fully integrated on a common substrate. The integrated tuner receives an RF signal having a plurality of channels and down-converts a selected channel directly to baseband for further processing. The integrated tuner includes o... | 10/23/2007 |
| 7274918 | Apparatus for automatically finding an am radio program The invention relates to a method for automatically finding an AM radio program, by which an AM radio receiver is tuned through in discrete steps, such that, for each set AM frequency, the reception quality at the currently set AM frequency is determined, the field ... | 09/25/2007 |
| 7272369 | Method for performing a frequency correction of a wireless device Frequency correction of a radio module. An estimate is made of the amount of frequency correction needed while applying an original reference frequency. If the frequency correction needed is greater than a pre-determined amount, a large shift frequency correction is... | 09/18/2007 |
| 7269401 | Signal processing circuit for tuner which applies signal processing based on variation in frequency of intermediate frequency signal A signal processing circuit for a tuner has a detector band pass filter for extracting a carrier of an intermediate frequency signal, a frequency counter for counting, based on a clock signal, a frequency of a carrier of the intermediate frequency signal which passe... | 09/11/2007 |
| 7266357 | Reduced local oscillator feedthrough quadrature image reject mixer An RF communications circuit having a reduced LO feed through image reject mixer is disclosed. The image reject mixer includes a quadrature phase transconductance stage coupled to a quadrature phase mixer of a quadrature phase mixer module and an in-phase mixer of a... | 09/04/2007 |
| 7263142 | Apparatus and method for synchronizing symbol timing using timing loop controller A timing loop controller for multilevel modulation scheme is disclosed. The timing loop controller includes a first to fourth computing unit for computing a timing error between an input timing of digital signals and a sampling timing; a first to fourth quantization... | 08/28/2007 |
| 7259417 | Direct digitally tunable microwave oscillators and filters A tunable element in the microwave frequency range is described that may include one or more tunable elements that are directly digitally controlled by a digital bus connecting a digital control circuit to each controlled element. In particular, each digital signal ... | 08/21/2007 |
| 7254164 | Method for transconductance linearization for DC-coupled applications A Class AB voltage-to-current converter includes a plurality of DC coupled transconductance stages that produce a linearized output and a biasing circuit. The biasing circuit generates a primary bias voltage that is greater than a generated secondary bias voltage. A... | 08/07/2007 |
| 7251300 | Method and apparatus for frequency tracking based on recovered data A method of frequency tracking based on recovered data, for use in an automatic frequency control subsystem at the receiver of a mobile station, is disclosed. The frequency tracking mechanism derives frequency error information from the recovered data to determine t... | 07/31/2007 |
| 7245597 | Method and system for performing handoff in wireless communication systems The structure of a time-multiplexed physical channel is used to time inter-frequency or inter-system search excursions. A mobile station that receives an instruction to perform a search excursion prepares for the search excursion by detecting the first radio frame o... | 07/17/2007 |
| 7243036 | System and method for calibrating the clock frequency of a clock generator unit over a data line In order to further develop a system (100) and a method for calibrating the clock frequency of at least one clock generator unit (38), in particular oscillator unit, that is assigned to at least one transmitting/receiving module (30), wherein—... | 07/10/2007 |
| 7236756 | Tuning signal generator and method thereof A front end tuning system includes a tuning signal generator. The tuning signal generator includes a digital-to-analog converter (DAC) to receive a pre-conditioned tuning signal at a reference input, to receive a digital value at a digital control input, and to prod... | 06/26/2007 |
| 7233774 | RF transceiver with compact stacked mixer design for multiple frequency conversion A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to wideband RF signals prior to transmission without requiring conversion to an intermed... | 06/19/2007 |
| 7231195 | Variable gain control circuit and receiver apparatus using the circuit Disclosed is a variable gain control circuit for executing automatic-gain-control on a variable gain amplification block composed of a plurality of amplifiers on which discrete gain setting is executed by a programmable-gain-amp method. A baseband amplifier (a varia... | 06/12/2007 |
| 7228117 | Frequency correction method and apparatus for correcting secular change In order to always maintain a frequency of an oscillator within a proper range, the frequency chages due to temperature and a secular change, a method is disclosed in which the secular change is calculated from past control information, and the frequency of the osci... | 06/05/2007 |
| 7224755 | Method and apparatus for generating a frequency control signal A receiver including a frequency converter which converts a frequency of a received signal according to a control signal to obtain a frequency-converted received signal, and an AFC (automatic frequency controller) which converts the frequency-converted received sign... | 05/29/2007 |
| 7221917 | Adjacent channel interference mitigation for FM digital audio broadcasting receivers A method of receiving an FM digital audio broadcasting signal including a first plurality of subcarriers in an upper sideband of a radio channel and a second plurality of subcarriers in a lower sideband of the radio channel comprises the steps of mixing the digital ... | 05/22/2007 |
| 7218901 | Automatic frequency control of multiple channels An architecture for providing high-speed access over frequency-division multiplexed (FDM) channels allows transmission of ethernet frames and/or other data across a cable transmission network or other form of FDM transport. The architecture involves downstream and u... | 05/15/2007 |
| 7212587 | Apparatus for reducing DC offset in a receiver Apparatus for reducing DC offset in a signal path of a conversion system comprising a front end circuit for providing an input signal having an a DC offset; an amplifier system coupled to the front end circuit to receive and amplify the input signal; a multi-bit sig... | 05/01/2007 |
| 7209716 | Radio communication system, radio station, and radio communication method A radio communication system comprises: a radio receiver including an interference canceller configured to generate a replica of a received signal and remove an interference signal from the received signal, and a frequency offset estimator configured to estimate a c... | 04/24/2007 |
