Abstract: A downconversion downconverts a received signal. The downconverted signal includes IQ mismatch. A compensation module generates a compensated signal based on (i) the downconverted signal and (ii) an IQ mismatch compensation value. First and second mixers mix the compensated withal with first and second oscillating signals, respectively. First and second Fast Fourier Transform (FFT) modules perform FFTs on outputs of the first and second mixers to generate a first and second FFT signals, respectively. An IQ mismatch estimation module captures portions of the first and second FFT signals generated in response to the received signal including a first and second predetermined sequences. The IQ mismatch estimation module generates the IQ mismatch compensation value based on: the portions of the first and second FFT signals; the first predetermined sequence; and the second predetermined sequence.

Abstract: Disclosed are an system and method for compensation of I/Q imbalance in a beamforming OFDM system. The system comprises: a TX beamformer configured at a transmitter end of the beamforming OFDM system; a noise whitener configured at a receiver end of the beamforming OFDM system; and a RX MMSE configured at the receiver end of the beamforming OFDM system. At least one of the TX beamformer, the noise whitener and the RX MMSE receiver, or any combination thereof are capable of jointly processing a carrier and its image subcarrier to compensate the I/Q imbalance in the beamforming system.

Abstract: A radio includes a first tuner and a second tuner. A processor compares a first perceivable volume level of a station tuned by the first tuner to at least one second perceivable volume level of at least one background station tuned by the second tuner. The processor enables automatic volume knob changes using a pre-calibrated lookup table that associates a volume step of the volume knob with a difference between the first perceivable volume level and the second perceivable volume level.

Abstract: Progressive cancellation of electromagnetic interference (EMI) is achieved by establishing a canceller stage processing order in a receiver feed circuit. Such a processing order may be one that progressively narrows an interference analysis bandwidth around desired target signal and optimizes gain-bandwidth characteristics of a cancellation loop in each canceller stage accordingly. A cancellation signal generated by each canceller stage is adaptively controlled without disturbing the stability of the cancellation loop. By doing so, the residual interference-to-noise ratio at each adaptive canceller stage is optimized independently from the closed cancellation loop control of the other canceller stages resulting in improved interference cancellation in the receiver feed circuit.

Abstract: A device for the automatic adjustment of a gain and/or attenuation factor of several amplification or attenuation elements connected in a cascade comprises respectively a detector for measuring a signal level of a signal disposed at the input of the respective amplification or attenuation element and respectively a downstream control unit for determining the gain and/or attenuation factor respectively associated with each amplification or attenuation element. The control unit is a forward control unit for determining the gain and/or attenuation factor respectively associated with each amplification or attenuation element dependent upon the measured signal level of the signal disposed at the input of each amplification or attenuation element.

Abstract: The present disclosure relates to a circuit for providing a signal gain, comprising: a first stage comprising a first set of variable gain transconductors arranged for receiving an input signal and for performing phase-shifting of the input signal, thereby producing an intermediate signal, and a second stage, comprising a second set of transconductors and a plurality of capacitors arranged for receiving the intermediate signal and for providing an output signal to a combiner, wherein the first stage and second stage together form a filter, and wherein the first set of variable gain transconductors and at least one of the transconductors of the second set define the signal gain of the circuit.

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: Systems and methodologies are described that facilitate calibration techniques for a station in a wireless communication system that can be utilized to provide joint estimates for distortion introduced by in-phase and quadrature (I/Q) imbalance and mixing-product modulated images.

Abstract: A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless communication receiver. The entries for each look-up table are estimated during a stage of the calibration phase. During such a calibration stage, for each selected gain of an amplification stage, a search logic estimates a current DC offset number and compares it to a previous DC offset estimate that is fed back to the search logic. If the difference between the current and previous estimates is less than a predefined threshold value, the current estimate is treated as being associated with the DC offset of the selected gain of the amplification stage and is stored in the look-up table. This process is repeated for each selected gain of each amplification stage of interest until the look-up tables are populated.

Abstract: A receiver includes a first mixer configured to provide an in-phase (I) component of a radio frequency (RF) signal to an I channel by down-converting the RF signal, a second mixer configured to provide a quadrature (Q) component of the RF signal to a Q channel by down-converting the RF signal, amplification means, arranged on the I and Q channels, configured to amplify the I and Q components, a mismatch estimator configured to convert the amplified I and Q components into a frequency domain, and estimate a gain mismatch value and a phase mismatch value on the basis of the converted components, and a mismatch compensator configured to compensate for mismatch of the received signal on the basis of the estimated gain and phase mismatch values.

Abstract: An interference signal reducing apparatus of a wireless communication system divides a signal that is input through a receiving antenna into a first signal and a second signal having a magnitude larger than that of the first signal and detects a frequency and a magnitude of an interference signal from the first signal, thereby generating an interference removal signal and then adds an interference removal signal to the signal that is input through the receiving antenna and thus reduces a magnitude of the interference signal.

Abstract: Provided are apparatus and method for receiving signals in a wireless communication system.

Abstract: A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless communication receiver. The entries for each look-up table are estimated during a stage of the calibration phase. During such a calibration stage, for each selected gain of an amplification stage, a search logic estimates a current DC offset number and compares it to a previous DC offset estimate that is fed back to the search logic. If the difference between the current and previous estimates is less than a predefined threshold value, the current estimate is treated as being associated with the DC offset of the selected gain of the amplification stage and is stored in the look-up table. This process is repeated for each selected gain of each amplification stage of interest until the look-up tables are populated.

Abstract: Disclosed is an apparatus for wirelessly transmitting and receiving energy and data including: a signal generator generating a first frequency signal for power transmission; a first matching circuit matching input/output impedance upon receiving the first frequency signal generated by the signal generator; an oscillator outputting a second frequency signal, a carrier frequency, by using the first frequency signal, generated by the signal generator, as a reference frequency; a mixer modulating a data signal output from a communication module by using the second frequency signal; a second matching circuit matching input/output impedance upon receiving a modulated signal by using the second frequency signal; a resonator resonating an output signal from the first matching circuit to a reception side apparatus; and a radiator radiating an output signal from the second matching circuit to the reception side apparatus.

Abstract: A tone detection device for detecting whether an input signal having a tone. The device includes a volume gain calculation unit performing a volume gain treatment on frame data and outputting the volume-gain-treated frame data and energy in time domain thereof, a threshold calculation unit calculating a threshold value on the basis of the energy of the volume-gain-treated frame data, a filter transforming the volume-gain-treated frame data by an algorithm and outputting a characteristic value in a first period, and a comparator comparing the first characteristic value and the threshold value to generate a result and determining the frame data of the input signal has the tone on the basis of the result.

Abstract: A receiver to recover a signal of interest while consuming reduced power in some scenarios. The receiver contains a in-phase channel processing path and a quadrature phase channeling path for down converting an input signal to an intermediate frequency, and then recovering the signal of interest by further processing of the input signal at intermediate frequency. One of the two paths is turned off upon occurrence of a desired condition, which reduces power consumption. In an embodiment, the condition is that the input signal does not contain an image signal of the signal of interest.

Abstract: A multi-path signal interference cancellation system cancels multiple time delayed signal components of a multi-path interference signal received by a receive antenna and carried on a receiver transmission line of a radio receiver system. The interference cancellation system includes a plurality of adaptive interference canceller circuits, each of which has a synchronous detector, a signal controller and an integrator as essential parts of closed control loops defined by the canceller circuits. The integrator has gain and bandwidth characteristics associated therewith which are adjustable to adjust the gain and bandwidth of each closed control loop. An intensity profile of the multi-path interference signal is generated and stored in a memory.

Abstract: A digital broadcasting receiving apparatus has a signal level detecting circuit; a peak detecting section; an abnormal peak deciding section; a specified peak deciding section; a prescribed in-band power deciding section; and makes a decision as to whether a signal being received is a digital broadcasting signal or not according to decision results output form the signal level detecting circuit, the abnormal peak deciding section, the specified peak deciding section and the prescribed in-band power deciding section.

Abstract: A diversity receiver includes a first radio frequency (RF) receiver section receives a first inbound RF signal over a range of frequencies and generates a first amplified RF signal, wherein the first inbound RF signal includes a desired RF signal component and an undesired signal component. A second RF receiver section receives a second inbound RF signal over the range of frequencies and generates a second amplified RF signal, wherein the second inbound RF signal includes the desired signal component and the undesired signal component. A first RF cancellation module generates a desired RF signal from the desired RF signal component while attenuating the undesired signal component, based on the first amplified RF signal and the second amplified RF signal.

Abstract: GPS signals are typically weak and thus easily interfered with by other radio transmissions in the same or adjacent frequency bands. Interference can be especially problematic when the GPS receiver is co-located with a communications device that includes a radio transmitter, such as a cellular telephone. The transmitted signal from the co-located communication device can overload (or saturate) the GPS receiver front-end designed to receive weak GPS signals. In such a situation no useful information can be extracted from the received GPS signals originating from the GPS satellites. Described herein is a novel apparatus and method that can be used to minimize the effect of co-located interference on a GPS receiver.

Abstract: A signal processing apparatus includes a plurality of equalizer each used for a corresponding frequency band, controller for setting a gain value in each of the plurality of equalizer, and signal processor for processing an input signal by means of the plurality of equalizer. The controller determines a target gain value for each of the plurality of frequency bands, obtains a value of gain leakage from the first frequency band to a second frequency band adjacent to the first frequency band, updates a gain value set for the second frequency band, updates a gain value set for the first frequency band, repeats an update process for updating the gain value for each of the first frequency band and the second frequency band in an alternate manner until the gain value satisfies a predetermined condition, and sets the updated gain value for each of the frequency bands in the corresponding equalizer.

Abstract: An antenna device including: an antenna unit having an oscillating body capable of oscillating at a predetermined natural frequency and being displaceable by an external magnetic field, and a converter for converting motion of the oscillating body to an electrical signal, when a radio wave signal having a frequency band for inducing resonance of the oscillating body comes, the oscillating body resonating with a magnetic field component of the radio wave signal, the converter converting resonance of the oscillating body to the electrical signal, and an electrical signal corresponding to the radio wave signal being outputted; a sensitivity varying section capable of varying degree of displacement of the oscillating body occurring by the external magnetic field; and a sensitivity controller for adjusting the degree of the displacement by using the sensitivity varying section in accordance with the electrical signal outputted from the antenna unit.

Abstract: Methods and systems for blocker attenuation using multiple receive antennas are disclosed. In this regard, a plurality of signals may be received via a corresponding plurality of antennas and a corresponding plurality of interference-suppressed signals may be generated. The interference-suppressed signals may be generated by adjusting a gain and phase of the plurality of received signals to generate a corresponding plurality of adjusted signals, and combining the corresponding plurality of adjusted signals, respectively, with the plurality of received. The gain of the received signals may be adjusted based on a wide bandwidth signal strength measurement and a narrow bandwidth signal strength measurement. A center frequency of one or more of the plurality of antennas may be adjusted based on received signals strength measurements. A gain and/or phase adjustment of each one of said received signals may be independent of gain and/or phase adjustments of other ones of the receive signals.

Abstract: A direct conversion receiver (200) includes a low noise amplifier (LNA) (213), at least one baseband amplifier (119, 123 and 127), register banks (250 and 251) for storing a plurality of offset data corresponding to at least two LNA gain settings and a plurality of baseband gain settings, a DC offset correction system (235) for providing a DC offset signal, a state machine (275) for sequencing through each of the plurality of baseband gain settings and through enable and disable states for the LNA, and a processor (290) programmed to activate the state machine and to run the DC offset correction system.

Abstract: A system to monitor gain in a broadband radio frequency transport system that includes a radio frequency antenna, a remote unit, and a host unit adapted to receive a signal from the remote unit over a transmission link. The remote unit includes a pilot tone generator adapted to generate at least one single-frequency tone having a known power level, a summing circuit operably associated with the pilot tone generator adapted to sum the single-frequency tone with the respective received radio frequency signal. Each host unit includes a pilot tone receiver circuit to receive the transmitted signal and detect the single-frequency tone transmitted over the transmission link. The host unit includes a controller to determine a gain within the transmission link and to determine if the gain is in a preset range of gains based on the power level of the received pilot tone.

Abstract: A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless communication receiver. The entries for each look-up table are estimated during a stage of the calibration phase. During such a calibration stage, for each selected gain of an amplification stage, a search logic estimates a current DC offset number and compares it to a previous DC offset estimate that is fed back to the search logic. If the difference between the current and previous estimates is less than a predefined threshold value, the current estimate is treated as being associated with the DC offset of the selected gain of the amplification stage and is stored in the look-up table. This process is repeated for each selected gain of each amplification stage of interest until the look-up tables are populated.

Abstract: A receiver to recover a signal of interest while consuming reduced power in some scenarios. The receiver contains a in-phase channel processing path and a quadrature phase channeling path for down converting an input signal to an intermediate frequency, and then recovering the signal of interest by further processing of the input signal at intermediate frequency. One of the two paths is turned off upon occurrence of a desired condition, which reduces power consumption. In an embodiment, the condition is that the input signal does not contain an image signal of the signal of interest.

Abstract: The radio receiving apparatus including an adaptive receive filter capable of detecting an interference wave and out-of-band noise level correctly and improving reception performance.

Abstract: Systems and methodologies are described that facilitate calibration techniques for a station in a wireless communication system that can be utilized to provide joint estimates for distortion introduced by in-phase and quadrature (I/Q) imbalance and mixing-product modulated images.

Abstract: A tone generator in a transceiver of a communications device may generate an arbitrary signal using two shift registers to generate the time intervals. During each time interval, a different capacitor is switched onto the node to change the voltage potential on that node. The amplitude of the waveform during each time interval is changed to provide the desired tone.

Abstract: A method and apparatus for measuring the characteristics of radio frequency energy in an industrial radio frequency processing system at a plurality of frequencies is disclosed. The method and apparatus measures the characteristics of radio energy using one detector.

Abstract: A method and radio receiver provide matching of output levels for a plurality of receiver input sources. The method includes the step of creating alignment information for the plurality of input sources. The method further provides for storing the alignment information in a computer readable memory, and converting a required output level into a matched output level. The matched output level is based on the alignment information contained in the computer readable memory corresponding to the selected input source, and the required output level is obtained from a volume control setting. Thus, creation, storage, and retrieval of alignment information allows for real-time matching of output levels for multiple input sources.

Abstract: A receiver in a communication system is coupled to a transmission channel for receiving communication signals transmitted over a transmission channel. The receiver includes signal receiving electronics for receiving communication signals directed to the receiver. The receiver also includes a controller, responsive to the receipt of a communication signal by the signal receiving electronics, to provide an enunciator enable signal, and a clock signal generator for generating a clock signal. The receiver further includes an enunciator coupled to the clock signal generator, for producing an electronic sound signal. The enunciator includes a volume control module for receiving a first periodic signal and providing a volume control signal. The enunciator also includes a divider for receiving the clock signal and providing a corresponding output signal having a frequency corresponding to the frequency of the clock signal frequency divided by a divider value.