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Class 455/71 - Frequency control


Subclass of Class 455 - Telecommunications
Definition: Subject matter where the frequency to which the receiver
No. of patents: 147
Last issue date: 08/02/2011


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NumberTitleIssue Date
7991362Methods and apparatus for supporting timing and/or frequency corrections in a wireless communications system
A wireless terminal determines the position of a moving base station and determines timing and/or frequency corrections. A wireless terminal determines its relative position with respect to the base station and determines a timing adjustment correction. The wireless...
08/02/2011
7444168Radio communication semiconductor integrated circuit, data processing semiconductor integrated circuit and portable device
A portable device having a communication function composed of a plurality of LSIs operated in synchronization with a clock, such as a baseband LSI and a logic LSI such as an application processor, can synchronize the baseband LSI with the logic LSI without lowering ...
10/28/2008
7436903Multicarrier transmitter and method for transmitting multiple data streams with cyclic delay diversity
A multicarrier transmitter may transmit cyclically delayed linear combinations of two or more data streams with three or more antennas. In some embodiments, the multicarrier transmitter may transmit cyclically delayed linear combinations of three data streams with f...
10/14/2008
7379904Method and storage medium for obtaining an offer for a sale of a product or a service
Systems and methods for obtaining an offer for a sale of a desired product or a service are provided. The method includes iteratively transmitting a first signal including a first data message using a mobile transceiver device. Each of the first data messages includ...
05/27/2008
7313205Method and apparatus for frequency correction in wireless local area network systems
A method and apparatus for frequency correction of a signal in a wireless local area network (WLAN) communication system is disclosed. The signal is processed to determine a frequency offset estimate which is a frequency deviation of the signal from a local oscillat...
12/25/2007
7310368Means for initiative synchronization and cell searching based on the CDMA system of multipath energy window
The present invention discloses an apparatus for initial synchronization and cell search in a CDMA system based on multipath energy window. The apparatus perform initial synchronization and adjacent cell search by using multipath energy window based on the processin...
12/18/2007
7301915System and method for resolving frequency and timing uncertainty in access transmissions in a spread spectrum communication system
A method for reducing the number of required frequency and time hypotheses to acquire an access transmission in a satellite communication system. By reducing the number of required hypotheses, the amount of hardware required to acquire the access transmission is red...
11/27/2007
7302236Radio communication method and system for performing communication among a plurality of radio communication terminals
A reference local oscillation signal transmission station 1 radiates a reference local oscillation signal to a service zone. A portion of the signal received by each radio slave station terminal 2 is branched and fed to an injection locked oscillator
11/27/2007
7299013Apparatus and method for correcting doppler shift in mobile communication systems
A system and method for correcting for Doppler shift in transmitted and received electromagnetic wave, light wave, or acoustic wave signals between two platforms, where at least one of the platforms is moving relative to the other. The system involves determining a ...
11/20/2007
7295594Device for low-interfernce signal transmission
Digital signal transmitter devices mostly present a distinct wide-band interference spectrum which renders compliance with the presently applicable EMC standards substantially more difficult. Available provisions for improving the EMC characteristics take an ...
11/13/2007
7272369Method 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
7212787Wireless audio transmission system
A wireless audio transmission and reception system includes a pulse width amplifier, an up-converter, a transmitter, a receiver, a down-converter, an integrator, and a power amplifier to transfer an analog signal to a transducer such as a speaker. The pulse width am...
05/01/2007
7199744Circuits and methods for reducing interference from switched mode circuits
A method of generating a pulse width modulated data stream includes providing a first clock signal having a first frequency and selecting a divisor from a set of divisors for dividing the first frequency to select a pattern rate of a pulse width modulated data strea...
04/03/2007
7171197Mobile wireless local area network and related methods
A wireless local area network adapted for use by users traveling on a mobile platform such as an aircraft. The network includes a network server located on the mobile platform, and at least one network access point connected to the server and accessible wirelessly b...
01/30/2007
7171213Method for operating in a 800 MHz trunked radio communications system for channels 440 to 559
A receiving device in a trunked radio communications system determines a transmit frequency, wherein the transmit frequency is calculated by subtracting 440 from a voice channel number, multiplying by a channel spacing and adding a base frequency to yield the transm...
01/30/2007
7161977Receiver having a ratio-based signal acquisition method
A GPS receiver having a ratio-based signal acquisition method. The GPS receiver has a tentative signal acquisition when a first ratio of the largest GPS signal correlation value to the second largest in a first time period exceeds a selected qualification ratio. The...
01/09/2007
7151477Signal detection
A transmitted signal and a received signal are combined and the combination is expected to determine whether or not a target signal is present. Either the transmitted signal or the received signal is combined with an auxiliary signal containing a range of frequencie...
12/19/2006
7142900Combined global positioning system receiver and radio
A portable GPS/radio unit (10) communicates over a wireless radio network (12) with at least one other such unit. The unit (10) may transmit radio signals over the network (12) indicative of the unit's location. The unit (10) inclu...
11/28/2006
7142819Circuits and methods for controlling switching noise in switched-mode circuits
A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels...
11/28/2006
7139320Method and apparatus for multicarrier channel estimation and synchronization using pilot sequences
Method and apparatus for OFDM synchronization and channel estimation. In a temporal embodiment, received embedded system pilot symbols are inverse Fourier transformed at expected index locations and correlated with computed complex conjugates of inverse Fourier tran...
11/21/2006
7099691Mobile radio terminal apparatus
A control unit controls a 1x RAKE receiving unit to intermittently receive a paging signal transmitted from a first base station in a first cycle, in the first cycle. The control unit also controls a 1xEV-DO RAKE receiving unit to intermittently receive a paging sig...
08/29/2006
7095993Frequency auto-correction apparatus for CDMA multipath fading channel
An automatic frequency correction (AFC) apparatus used for CDMA multipath fading channels comprises a frequency-offset evaluator, an automatic frequency correction loop filter and a carrier frequency adjuster. The present invention provides a “multipath energy win...
08/22/2006
7085573Method for operating in a 800 MHz trunked radio communications system for channels 0 to 119
A receiving device in a trunked radio communications system requests a voice channel for a communication and receives an outbound signaling message on a control channel comprising a voice channel number for the receiving device to utilize for the communication. The ...
08/01/2006
7072613Wireless communication medium processing apparatus and wireless communication medium processing system
This invention is a wireless communication medium processing apparatus which carries out communication with a wireless communication medium, to carry out at least one of reading and writing as to information which was stored in the wireless communication medium, and...
07/04/2006
7072631Mobile communication terminal and method of calibrating frequency in the same
A mobile communication terminal includes (a) a first unit for calibrating a frequency, (b) a global positioning system (GPS) module, and (c) a processor which electrically connects the first unit and the global positioning system module to each other. The first unit...
07/04/2006
7069048Base station system supporting multi-sector/multi-frequency assignment for seamless call service
A base station system supporting multi-sector/multi-FA in which, when a board goes out of order, a redundant board is automatically switched on, so as to prevent the call from being cut off and the entire capacity of the system from being influenced, thereby enablin...
06/27/2006
7062228Cellular communications system using baseband carrier injection and related methods
A cellular communications system may include one or more cellular base stations and a plurality of mobile cellular communications devices for communicating therewith. More particularly, the cellular base station and the mobile cellular communications devices may eac...
06/13/2006
7046968Frequency correcting method for cellular phone terminal
When a cellular phone terminal is powered on, it immediately receives a reference signal (non-modulated reference frequency signal for correcting a crystal oscillation circuit) for correcting the reception frequency of a radio signal transmitted from a base station ...
05/16/2006
7035351Automatic gain control loop apparatus
A DC offset cancelling circuit with multiple feedback loops suppresses DC offset voltages within an automatic gain control loop apparatus. The apparatus includes a plurality of gain stages connected in series that receive and amplify an input RF signal. Each gain st...
04/25/2006
7035605Method and device for automatic control of the frequency of a local oscillator in a DS-CDMA type receiver
A method for controlling frequency of a local oscillator in a DS-CDMA type receiver includes transforming a known spread spectrum signal into a sampled digital signal formed of symbols with a despreaded frequency spectrum, and determining a residual frequency error ...
04/25/2006
7027775Method of automatic frequency-setting for wireless microphone-receivers
The present invention relates to a method of automatically setting each of frequencies in each of a plurality of wireless microphone-receivers simultaneously used in the same area, based on the combinations of simultaneously usable frequencies. Each of microphone-re...
04/11/2006
7024215Methods and apparatuses for measuring frequencies of basestations in cellular networks using mobile GPS receivers
Methods and systems for frequency synchronizing base stations in a cellular communication system. In one aspect of the invention, a method to measure a frequency related to a base station of a cellular communication system includes receiving a satellite positioning ...
04/04/2006
7010271Circuits and methods for reducing interference from switched mode circuits
A system 100 including a radio receiver 101/108 and switched mode circuitry 114/115 operating at a selected switching frequency is disclosed. Circuitry 207–209 sets the switching-circuitry of the switched mode circuitry 114/115 a...
03/07/2006
7010066System and method for fast code phase and carrier frequency acquisition in GPS receiver
A GPS receiver acquires carrier frequency and Gold code phase using short segments of a received GPS signal. In one embodiment, a 1-ms segment of the GPS signal is transformed to the frequency domain. This is multiplied by a frequency representation of the Gold code...
03/07/2006
7003273Temperature compensating circuit, electronic apparatus and radio unit having temperature compensating function
A temperature compensating circuit is provided in a radio unit, an ambient temperature is detected by a temperature sensor of the temperature compensating circuit, the detected temperature value is supplied to a correction address storage section as an address after...
02/21/2006
6998834Real-time time drift adjustment for a TDR step stimulus
A method for reducing drift in a step stimulus from a sampling system, such as an oscilloscope, is described having an initial step of setting a calibration repetition rate. A step stimulus stabilization calibration is performed to acquire a reference mid-crossing t...
02/14/2006
6980769Method for determining the validity of a radio station lookup table
The continuing validity of a lookup table in a radio receiver for tuning to digital audio stations is monitored. The radio receiver is tuned to a first designated frequency. A determination is made whether a station identification code is identified in a digital bro...
12/27/2005
6975839Apparatus, and associated method, for estimating frequency offset using filtered, down-sampled likelihood polynomials
Apparatus, and an associated method, for facilitating frequency offset estimation between communication stations operable in a communication system. A likelihood polynomial is calculated and provided to a filter. The filter forms a filtered representation of the lik...
12/13/2005
6970503Apparatus and method for converting analog signal to pulse-width-modulated signal
A circuit for converting an analog signal to a discrete pulse-width-modulated (PWM) signal uses a delta-sigma amplifier and a discrete PWM stage to produce a discrete PWM output signal having lower in-band signal noise then a PDM system and a lower signal distortion...
11/29/2005
6952590Apparatus and method for a multi-channel, multi-user wireless intercom
Method and apparatus for providing a multi-channel, multi-user wireless intercom, comprising a plurality of multi-channel wireless transceiver radios configured to form a radio unit. Each user in a group of users employs a radio unit to communicate with other users ...
10/04/2005
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