Abstract: A method is provided for adjusting the resonance frequency of a resonance circuit included in an electronic pen. The method uses adjusting means for adjusting the capacitance of an internal capacitor array and measuring means for measuring an alternating magnetic field generated by the resonance circuit. The method includes (1) a step of changing the state of a predetermined portion of multiple capacitive elements constituting the internal capacitor array, and (2) a step of changing, according to reference resonance frequency variations of the resonance circuit before and after the state change, the state of a portion or all of at least one capacitive element constituting the inner capacitor array other than said predetermined portion of the capacitive elements.

Abstract: A shared spectrum manager (SSM) may enable spectrum access for Tier 2 Users (T2Us) and Tier 3 Users (T3Us) while provisioning quality of access (QoA) in a dynamic shared spectrum environment while ensuring sufficient spectrum and interference protection for Tier 1 Users (T1Us). The SSM may enable new user spectrum authorizations by sending, to a regulator, a request for administrative information, and receiving, from the regulator, a policy and user authorization information for at least one user. The SSM may register a T2U with or without contacting the regulator. The SSM may perform quality based admission control by receiving periodic measurements from a master device of each T2U with an active frequency assignment indicating a Quality of Operation (QoO) experienced by the respective T2U, maintaining a map of an effective QoOs for a plurality of T2Us, and categorizing protection contours associated with each of the plurality of T2Us.

Abstract: A communication device for performing device-to-device (D2D) wireless communications with a first neighboring communication device is provided. The D2D communication device includes a wireless module, a counter, and a controller module. The wireless module performs wireless transmissions and receptions. The counter has a count value and a threshold value. The controller module determines whether to broadcast proximity signal via the wireless module according to a comparison result of the count value and the threshold value, wherein the controller module determines to broadcast a first proximity signal to the first neighboring communication device via the wireless module when the count value reaches the threshold value, wherein the count value of the counter is changed according to a second proximity signal broadcasted by the first neighboring communication device.

Abstract: A method and apparatus for use in a spectrum manager are disclosed herein. A method includes receiving device parameters from a wireless transmit/receive unit (WTRU) in a managed area, transmitting the device parameters to a central television band (TVBD) data base server, wherein the spectrum manager also stores the device parameters in a local database, receiving enabling information from the central TVBD data base server, and transmitting the enabling information to the WTRU in the managed area.

Abstract: In a cognitive radio communication device, before a communication link for the cognitive radio communication is established, a control channel which is a common channel which can be used by a plurality of cognitive radio communication devices is detected. By exchanging sensing information and sensing control information among the plurality of radio communication devices using the detected common channel, the information is shared. The plurality of cognitive radio communication devices share the sensing information and the sensing control information, and use the information for determining a channel used for spectrum monitoring and data communication, and the like.

Abstract: In accordance with embodiments of the present disclosure, an information handling system is provided. The information handling system may include a processor; a display coupled to the processor, the display comprising a pixel clock source configured to generate a pixel clock frequency; a memory device coupled to the processor, the memory device having a lookup table stored thereon; and a controller coupled to the processor and configured for: receiving frequency information associated with wireless transmissions of the information handling system; and dynamically adjusting the pixel clock frequency by selecting a frequency from the lookup table in response to a determination that the received frequency information is approximately equal to the pixel clock frequency.

Abstract: A radio-frequency (RF) front-end circuit includes a tunable filter, a negative transconductance circuit coupled with the tunable filter to produce a tuning oscillation signal, and a counter arranged to determine a frequency of the tuning oscillation signal. The RF front-end circuit also includes a control circuit arranged to shift the frequency of the tuning oscillation signal by adjusting the tunable filter until the frequency of the tuning oscillation signal falls within an acceptable frequency range corresponding to a desired channel frequency band.

Abstract: The present invention discloses a method for implementing automatic frequency control, and an apparatus thereof. The method discloses: calculating a correlation value of common pilot symbols in a reception signal of each path and a frequency offset value, calculating a combined frequency offset value according to the frequency offset value of each path, and determining, according to the combined frequency offset value, a frequency offset adjustment value for a voltage controlled oscillator, a frequency offset adjustment value for overall reception signals and a frequency offset adjustment value for the reception signal of each path. The present invention selects a method of small-scope frequency offset estimation, which makes frequency offset estimation more accurate.

Abstract: An electronic device capable of performing automatic frequency control (AFC) to maintain frequency and timing without good received bursts, in which an oscillation unit and a baseband processing unit are provided. Wherein, the baseband processing unit computes a compensation adjustment according to a prediction model and stored information regarding a previous digital value adjustment when detecting that the baseband processing unit is incapable of controlling the oscillation unit according to received bursts from the remote communication unit, and adjusts the oscillation unit according to the determined compensation adjustment.

Abstract: A synthesizer includes a synthesizer unit for generating a local oscillation signal based on a reference oscillation signal output from a reference oscillation unit including a MEMS resonator, a frequency fluctuation detector for detecting a frequency fluctuation of the MEMS resonator, and a frequency adjuster for adjusting a frequency of the local oscillation signal based on the frequency fluctuation detected by the frequency fluctuation detector. This synthesizer can output a signal with a stable frequency, even when an MEMS resonator demonstrating a large fluctuation in an oscillation frequency to temperatures is used.

Abstract: A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down converted to base band frequencies and base band signals to be up converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning the LO frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.

Abstract: Systems and methods for using non-crystal-based reference oscillators in the transmission and reception of frequency-modulated signals are disclosed. To protect against intrusion on neighboring designated frequency bands, guard bands, having a collective width greater than the total expected error based on the contribution of the frequency error from the non-crystal-based oscillators in the transmitter and/or receiver, can be designated. To protect against inter-channel interference within a designated frequency band, transmitters and receivers can include static sub-bandwidths wider than any possible total frequency error, such that it would be impossible for a transmitter or receiver to attempt to communicate on an unintended sub-band.

Abstract: A frequency control device receiving a signal transmitted from each of a plurality of mobile stations, the frequency control device includes a first detecting unit to detect a frequency deviation generated from the signal, a second detecting unit to acquire information about at least a current position or movement of each of the mobile stations as classification information, and a classifying unit to classify mobile stations estimated to be moving in a same moving direction with a same moving speed as a first mobile station based on the classification information. The frequency control device includes a first calculating unit to calculate a first frequency deviations of a signal received from the first mobile station, and a compensation unit to compensate the frequency deviation of the signal received from the first mobile station based on the first frequency deviation.

Abstract: Disclosed is a radio frequency (RF) receiver for receiving a communication channel modulated on one or more carrier frequencies. The receiver may include a gain adjustable RF amplifier, a wideband signal power measurement circuit, and control logic. The control logic may be adapted to use outputs of one or more measurement circuits to classify interfering signals based on measured signal power and spectral proximity to the one or more channel carrier frequencies, and to adjust the gain of the radio frequency amplifier based on the classification.

Abstract: A clock signal generating arrangement for a communication device generates a system clock signal at an output for use as a timing reference. The clock signal generating arrangement comprises a reference clock generator for generating a reference clock signal, a main clock generator for generating a main clock signal having a greater accuracy than the reference clock signal, a clock adjust circuit coupled to the reference clock generator for generating a compensated reference clock signal to compensate for error in the reference clock signal and a clock signal selector coupled to the reference clock generator the main clock generator and the clock adjust circuit.

Abstract: Systems and methods for operating with oscillators configured to produce an oscillating signal having an arbitrary frequency are described. The frequency of the oscillating signal may be shifted to remove its arbitrary nature by application of multiple tuning signals or values to the oscillator. Alternatively, the arbitrary frequency may be accommodated by adjusting operation one or more components of a circuit receiving the oscillating signal.

Abstract: A method and apparatus for automatic frequency control in a receiver of a wireless device, the method determining a channel estimation for a received signal; calculating a signal to noise ratio for the channel estimation; applying a weighting factor determined based on the calculated signal to noise ratio for the channel estimation to the channel estimation to create a weighted channel estimation; and supplying the weighted channel estimation to a voltage controlled oscillator.

Abstract: A method and a system for scanning frequencies in an electronic device include storing one or more frequencies, performing a scan based on the stored frequencies for a predetermined time interval, and establishing a connection based on the scan. The system includes an acquisition database for scanning frequencies in an electronic device, a timer module for setting a predetermined time interval as the scanning interval, and a frequency identification module for identifying one or more frequencies of a normal scan and a limited scan.

Abstract: A management unit allocates network resources multiservice communication devices capable of communicating via a plurality of networks. The management unit includes a communication device interface for facilitating a bidirectional data communication with the multiservice communication devices via a wireless control channel, the bidirectional data communication including outbound control data sent to multiservice communication devices and inbound control data received from at multiservice communication devices. The wireless control channel is separate from the communication between multiservice communication devices and the networks. A network interface receives network resource data from the networks. A management processing unit generates the outbound control data in response. The management processing unit facilities the handoff of a real-time service accessed by the multiservice communication devices via a first network to a second network.

Abstract: Systems and methods for operating with oscillators configured to produce an oscillating signal having an arbitrary frequency are described. The frequency of the oscillating signal may be shifted to remove its arbitrary nature by application of multiple tuning signals or values to the oscillator. Alternatively, the arbitrary frequency may be accommodated by adjusting operation one or more components of a circuit receiving the oscillating signal.

Abstract: A management unit allocates network resources to a plurality of multiservice communication devices capable of communicating via a plurality of networks. The management unit includes a communication device interface for facilitating a bidirectional data communication with the plurality of multiservice communication devices via a wireless control channel, the bidirectional data communication including outbound control data sent to at least one of the plurality of multiservice communication devices and inbound control data received from at least one of the plurality of multiservice communication devices, wherein the wireless control channel is separate from the communication between the plurality of multiservice communication devices and the plurality of networks. A network interface receives network resource data from the plurality of networks.

Abstract: A service aggregator allocates network resources to a plurality of multiservice communication devices capable of communicating via a plurality of networks. The service aggregator includes a communication device interface for facilitating a bidirectional data communication with the plurality of multiservice communication devices via a wireless control channel, the bidirectional data communication including outbound control data sent to at least one of the plurality of multiservice communication devices and inbound control data received from at least one of the plurality of multiservice communication devices, wherein the wireless control channel is separate from the communication between the plurality of multiservice communication devices and the plurality of networks. A network interface receives network resource data from the plurality of networks.

Abstract: There is provided a method for generating an error signal for an automatic frequency control (AFC) loop in a Code Division Multiple Access (CDMA) system. Sign information relating to phase differences in received pilot signals is accumulated. In one embodiment, the accumulated sign information is compared against predetermined threshold levels. The error signal is generated when at least one of the predetermined threshold levels is satisfied. In a second embodiment, the accumulated sign information is decimated. An output of the decimating step is utilized as the error signal for the AFC loop.

Abstract: In accordance with embodiments of the present disclosure, an information handling system is provided. The information handling system may include a processor; a display coupled to the processor, the display comprising a pixel clock source configured to generate a pixel clock frequency; a memory device coupled to the processor, the memory device having a lookup table stored thereon; and a controller coupled to the processor and configured for: receiving frequency information associated with wireless transmissions of the information handling system; and dynamically adjusting the pixel clock frequency by selecting a frequency from the lookup table in response to a determination that the received frequency information is approximately equal to the pixel clock frequency.

Abstract: 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 which sets an initial value of a frequency in the demodulation process by the demodulating unit and for correcting a frequency error of a frequency used for the demodulation process by the demodulating unit based on the carrier wave frequency error detected by the detecting unit; and a control unit which controls a setting of an initial value of a frequency in the demodulation process by the demodulating unit by means of the frequency control unit after a receiving channel is switched, based on the carrier wave frequency error before a receiving channel is switched, the error being detected by the detecting unit, when a receiving channel is switched.

Abstract: Frequency conversion methods and systems for Bluetooth and FM radio communication are provided. FM data may be received and/or transmitted via the FM radio and Bluetooth data may be received and/or transmitted via the Bluetooth radio. With an integration of frequency conversion for Bluetooth and FM, both systems can operate from a single frequency source, thereby reducing part count and power consumption. Communication between Bluetooth and FM channels may be enabled via a single chip.

Abstract: 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 matter how large the frequency offset is, and minimize structural complexity, although a frequency offset tolerance range is higher than a symbol rate and a method thereof. The carrier frequency recovering apparatus includes a phase shift estimation part for estimating a phase shift value caused by a frequency offset based on a received preamble signal; a compensation part for compensating a receiving signal based on the estimated phase shift value obtained in the phase shift estimation part prior to differential decoding; and a detection part for detecting the compensated signal obtained in the compensation part.

Abstract: The method according to the invention for adjusting the tuning of a receiver circuit for receiving modulated a high frequency signal within a frequency range, the high frequency signal comprising a sync signal, uses the steps of shifting a frequency of a local oscillator within the frequency range and looking for the sync signal, and storing the value of a first frequency, when a sync signal is recognized. Then, the frequency of the local oscillator is continuously shifted in the same frequency direction across the bandwidth of the modulated high frequency signal by controlling the presence of the sync signal. The frequency, at which the sync signal is lost, is stored as a second frequency. From the first and the second frequency in a further step an optimum tuning frequency, located between the first and second frequency, is calculated for the reception for the high frequency signal.

Abstract: A cognitive radio system includes: a state detecting device that scans a frequency band allocated to another radio system than the cognitive radio system to detect a first use-state of the frequency band; a first server including a first gathering unit that receives first information relating to the first use-state and a second gathering unit; a second server that stores a second use-state of the frequency band allocated to the other radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and a notifying unit that notifies a terminal device in the cognitive radio system of information of an available channel based on the first information and the second information.

Abstract: On transition of a 1x system from a standby state in which standby processing is performed to out of service state in an SHDR mode, the standby processing for the 1x system using a receiver unit (RX1) is halted and, when an instruction to switch from a call through an EVDO system using a transmitter-receiver unit (RX0/TX) and/or the receiver unit (RX1) to a call through the 1x system using the transmitter-receiver unit (RX0/TX) during the halt state is detected, a system detection process for detecting the 1x system is performed by using the receiver unit (RX1).

Abstract: A radio wave receiver having an antenna for receiving a radio wave; a tuning unit for switching a frequency characteristic of the antenna in a stepwise fashion; an oscillation unit for oscillating a circuit section including the antenna and the tuning unit; a receiving process unit for executing a signal process by extracting a signal of a desired wave among received signals received by the antenna; and a search control unit for causing the oscillation unit to generate an oscillation signal at the circuit section and for searching, by switching a setting of the tuning unit, a setting condition of the tuning unit at which condition the oscillation signal is extracted by the receiving process unit; wherein the search control unit changes the number of minimum switching steps to be taken at a time or set pattern according to an adjustable range of the tuning unit.

Abstract: An object of the present invention is to provide a radio receiver and a method for detecting carrier waves which make it possible to detect carrier waves for an IBOC type hybrid broadcast reliably. A radio receiver for receiving carrier waves for hybrid broadcasts which are arranged so as to be adjacent to and located on both sides of carrier waves for analog broadcasts in frequency bands includes a tuner for tuning to a broadcast frequency, and a controller for setting a center frequency of shift frequency in a range where carrier waves for an analog broadcast can be detected and allowing the tuner to tune to the set shift frequency.

Abstract: A method includes a foreground process and a background process. In the foreground process, an input signal is processed using a first reference signal to generate an output. A first frequency control signal is generated from the output. A frequency of the first reference signal is controlled based on the first frequency control signal. In the background process, a foreground processed signal is received from the foreground process. The foreground processed signal is processed using a second reference signal. A second frequency control signal is generated from the foreground processed signal. A frequency of the second reference signal is controlled based on the second frequency control signal so that the background processing step removes effects of the foreground controlling step.

Abstract: A front-end architecture and processing method for a receiver in a multi-antenna, multi-band radio. Band-dependent components for multiple frequency bands are not duplicated in each receive chain. In one embodiment, a first receive chain includes band-dependent components for the first frequency band only. A second receive chain includes band-dependent components for the second frequency band only. The receive chains may be dedicated to particular antennas, or a switch may be utilized to route signals from different antennas to the different band-dependent components. Each receive chain may include band-independent components, or a single set of band-independent components may be utilized for the different receive chains by multiplexing the output of the band-dependent component sections.

Abstract: A radio broadcast receiver includes: a frequency conversion circuit for receiving a radio broadcast wave and for outputting a reception signal; a detection circuit for detecting the reception signal of an analog radio broadcast wave and for outputting a detection signal; an automatic tuning device for searching a broadcast frequency; and a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal. The automatic tuning device selects the broadcast frequency when the reception signal level is equal to or larger than a predetermined electric field intensity threshold value and a noise detection signal level is equal to or smaller than a predetermined noise determination threshold value.

Abstract: Counter-clockwise and clockwise quadrant transitions are detected and accumulated with respect to a received complex signal over a certain time period. These transitions may then be compared in order to obtain information indicative of both a magnitude and phase of a carrier frequency error for the received signal. Additionally, zero-crossings of the received complex signal over the same certain time period are detected and accumulated. The accumulated crossings provide information indicative of frequency offset magnitude. The determined magnitude and phase of the frequency error may then be used to adjust a local oscillator frequency to provide for improved receiver performance.

Abstract: A transceiver system includes a first section coupled to a first antenna, a second section coupled to a second antenna, and a radio frequency (RF) unit. The first section includes a transmit path and a first receive path for a first (e.g., GSM) wireless system, a transmit path and a first receive path for a second (e.g., CDMA) wireless system, and a transmit/receive (T/R) switch that couples the signal paths to the first antenna. The second section includes a second receive path for the first wireless system and a second receive path for the second wireless system. The first and second receive paths for the first wireless system are for two frequency bands. The first and second receive paths for the second wireless system are for a single frequency band and provide receive diversity. The transceiver system may include a GPS receive path coupled to a third antenna.

Abstract: A network search method for a mobile communication terminal is disclosed. In one example embodiment, a mobile communication terminal employing a Digitally Controlled Crystal Oscillator (DCXO) performs a network search method including the act of searching for a frequency using a value stored in an Automatic Frequency Control (AFC) mode.

Abstract: In one embodiment, this disclosure describes a frequency synthesizer for use in a wireless communication device, or similar device that requires precision frequency synthesis but small amounts of noise. In particular, the frequency synthesizer may include a phase locked loop (PLL) and an integrated voltage controlled oscillator (VCO). The frequency synthesizer may implement one or more calibration techniques to quickly and precisely calibrate the VCO. In this manner, the analog gain of the VCO can be significantly reduced, which may improve performance of the wireless communication device. Also, the initial state of the PLL may be improved to reduce lock time of the PLL, which may enhance performance of the wireless communication device.

Abstract: A wireless reception apparatus is provided. The apparatus includes a scan unit for periodically scanning favorite channels which are selectable as a playing channel, and recording broadcasting signal properties of each favorite channel; an evaluation value calculating module for calculating an evaluation value of each favorite channel according to the broadcasting signal properties thereof; a channel selection module for selecting one of the favorite channels as a playing channel according to the evaluation values; and a signal receiving unit for receiving radio signals in the playing channel. A wireless reception method is also provided.

Abstract: A system and method for inverting automatic frequency control applied to a reference signal used to process an input signal is disclosed. When receiving an input communication signal, a receiver controls the frequency of the reference signal to compensate for frequency differences between a transmitter and a local oscillator in the receiver. The frequency control applied to the reference signal causes frequency variations in a resultant processed signal when the input signal is processed using the reference signal. The frequency of a second reference signal is controlled such that further processing of the resultant processed signal removed effects of the frequency control applied to the reference signal. The processing which applies frequency control to the reference signal is performed in real time while the inversion process is performed in a separate processing section.

Abstract: A base station and a method of configuring a base station are provided in a cellular telecommunication system, wherein the base station comprises an electrically tunable duplex filter with a tuning range covering at least two parallel sub-bands used in the telecommunication system. The electrically tunable duplex filter is tunable on site to a sub-band allocated to the base station, thus enabling an increased flexibility in selecting a fixed frequency band to be used in the lower frequency stages in the transceiver and the base band parts of the base station.

Abstract: A method for quantifying idle radio spectrum access across a geographic region. The method selects geo-referenced locations from within the geographic region to form a geo-referenced set of observation locations. Geo-referenced coverage areas for one or more wireless devices within the geographic region are independently integrated to form an assessment of multidimensional radio spectrum conditions across the geographic region. The method then computes geo-referenced portions of idle multidimensional radio spectrum access across the geographic region. The method may additionally express the geo-referenced portions of idle multidimensional radio spectrum access in terms of spatial statistics, aggregate statistics, and a combination of spatial statistics and aggregate statistics. A system capable of quantifying idle radio spectrum access across a geographic region. Geo-referenced locations within the geographic region are selected to form a geo-referenced set of observation locations.

Abstract: 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 peak position value. A zero-run value is then calculated by counting the number of successive 0s in the difference value (dev), and an AFC voltage from controlling an oscillator is obtained based on the difference value. This difference value is then used to control a frequency of a transmitter in the terminal. Accordingly, an accurate oscillation frequency can be generated without being affected by noise existing in the communication environment and thus communication performance can be enhanced.

Abstract: A frequency offset detector for AFC under Rayleigh fading. The AFC includes a variable phase generator, an exponential term ej ?107 t multiplied on an incoming signal, a low-pass filter, a gain amplifier, a multiplier, and an offset detector. The offset detector includes a filter, an amplifier, a delay block, three adders, and two blocks that output the absolute value of an inputted signal. The filter is a Finite Impulse Response (FIR) filter that produces a Hilbert Transformation of the inputted complex gain. The Hilbert FIR filter, together with the complex gain and two of the adders, generate two complex signals: Xp and Xn respectively representing the positive and negative frequency components of the inputted complex gain. The detector output is equal to the difference between the magnitudes of Xp and Xn.

Abstract: A receiver receives communication signals on an assigned frequency channel while monitoring the signals received on other frequency channels. A communication processor processes the received communication signals from the current base station while a wideband digitizer processes received filtered signals on the other frequency channels, which correspond to the neighboring base stations. The wideband digitizer generates numerical samples representing the filtered signals in response to a control signal generated by a control processor. The control processor then determines characteristic signals of the frequency channels.

Abstract: The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit the received radio signal is down-converted, and converted to complex baseband digital samples by an analog-to-digital converter. A downlink digital phase rotator applies a fine frequency shift to the samples in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a digital-to-analog converter and upconverted in frequency for radio transmission to the remote unit.

Abstract: 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 peak position value. A zero-run value is then calculated by counting the number of successive 0s in the difference value (dev), and an AFC voltage from controlling an oscillator is obtained based on the difference value. This difference value is then used to control a frequency of a transmitter in the terminal. Accordingly, an accurate oscillation frequency can be generated without being affected by noise existing in the communication environment and thus communication performance can be enhanced.

Abstract: A wideband receiver (10) comprises a frequency converter (16) for converting the frequency of a signal inputted through an antenna (12) by using a local oscillation signal from a local oscillator (18); a wideband filter (20) for receiving the output of the frequency converter (16) and passing a signal component corresponding to the scanning band including the bands of channels; an A/D converter (22) for converting the output of the wideband filter (20) into a digital signal; an FFT operational circuit (24) for receiving the digital signal and subjecting it to high-speed Fourier transformation; and a control circuit (26) for detecting the channel in communication in a predetermined scanning band on the basis of the results of operation of the FFT operational circuit. The control circuit (26) repeats the change of the scanning band by changing the frequency of the local oscillation signal, to detect the channel in communication with an assigned frequency range, i.e., a search frequency range.

Abstract: A transceiver system includes a first section coupled to a first antenna, a second section coupled to a second antenna, and a radio frequency (RF) unit. The first section includes a transmit path and a first receive path for a first (e.g., GSM) wireless system, a transmit path and a first receive path for a second (e.g., CDMA) wireless system, and a transmit/receive (T/R) switch that couples the signal paths to the first antenna. The second section includes a second receive path for the first wireless system and a second receive path for the second wireless system. The first and second receive paths for the first wireless system are for two frequency bands. The first and second receive paths for the second wireless system are for a single frequency band and provide receive diversity. The transceiver system may include a GPS receive path coupled to a third antenna.