Abstract: Several circuits and methods implemented to perform signal quality estimation and control are disclosed. In an embodiment, a method of signal quality estimation includes generating a demodulated signal associated with a radio signal. Information associated with a quality of the demodulated signal is accessed. Further, a value of radio frequency signal-to-noise ratio (RF-SNR) for the radio signal based on the information is estimated. Estimating the value of RF-SNR facilitates in signal quality estimation of the radio signal and control of the demodulated signal.

Abstract: A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

Abstract: A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

Abstract: A wireless receiver (10) includes a down converter module (210) operable to deliver a signal having a signal bandwidth that changes over time, a dynamically controllable filter module (200) having a filter bandwidth and fed by said down converter module (210), and a measurement module (295) operable to at least approximately measure the signal bandwidth, said dynamically controllable filter module (200) responsive to said measurement module (295) to dynamically adjust the filter bandwidth to more nearly match the signal bandwidth as it changes over time, whereby output from said filter module (200) is noise-reduced. Other wireless receivers, electronic circuits, and processes for their operation are disclosed.

Abstract: A wireless receiver scan circuit (10) including a low-IF de-rotator (210) with signal band and image band outputs, and search circuitry (80, 200) operable to parallelize (100) a frequency-scanning search by determination of the presence and absence of a transmission in both the signal band and the image band. Other circuits, systems and processes are also disclosed.

Abstract: A method and an integrated circuit to improve sensitivity of decoding time of a GNSS receiver are disclosed. A plurality of estimates of states of an encoder for one or more instances of a time counter is maintained. A signal comprising a plurality of data bits corresponding to an instance of the time counter is detected and at least one augmented state for each estimate of states of the encoder is determined. A corresponding augmented state for successive instances of the time counter is predicted and an augmented branch metric for each of the at least one augmented state is computed. A path metric for the each estimate is updated based on the augmented branch metric for each of the at least one augmented state and a time counter value is determined based on the path metric for the each estimate.

Abstract: By a medical implant transceiver implantable within a body of a living organism, a portion of a signal is received from a medical controller transceiver external to the body of the living organism. Based on directions within the portion of the signal, a time duration is determined, after which a subsequent portion of the signal is to be transmitted from the medical controller transceiver. The directions include a value indicative of the time duration. The time duration differs based on the value. The subsequent portion is to be transmitted from the medical controller transceiver after an end of the portion. The medical implant transceiver enters into an inactive state for the time duration and awakens after the time duration has elapsed.

Abstract: System and method for hybrid positioning using blended Wi-Fi and GNSS solution is presented, which provides an overall good positioning accuracy as compared to feed forward blending solution. Feeding back Wi-Fi and GNSS blended solutions to replace position states in GNSS enables blended solution to improve using past Wi-Fi information and also enables early correction of GPS drifts in urban canyons. Smart blending prevents early degradation of blended solution due to bad Wi-Fi information. Additionally, it gives good performance in open sky and mild urban canyons where GPS performance is generally quite good. Constrained blending enables good blending even with dependent or clustered Wi-Fi positions. It also keeps feedback loop stable by limiting changes to a blended solution.

Abstract: A digital circuit includes at least one input node, a biasing circuit, and a digital baseband circuit. The input node receives a digital signal including samples at a plurality of sample instances, the samples including a positive sample and a negative sample and represented by first plurality of bits. The biasing circuit generates a biased digital signal by adding a bias value to the digital signal so as to change the positive sample and the negative sample to first sample and second sample respectively and represented by second plurality of bits. The digital baseband circuit is configured to receive and process the biased digital signal such that reduced current consumption is realized based on a number of bit toggles in the second plurality of bits being less than a number of bit toggles in the first plurality of bits.

Abstract: Apparatus and methods disclosed herein perform gain, clipping, and phase compensation in the presence of I/Q mismatch in quadrature RF receivers. Gain and phase mismatch are exacerbated by differences in clipping between I & Q signals in low resolution ADCs. Signals in the stronger channel arm are clipped differentially more than weaker signals in the other channel arm. Embodiments herein perform clipping operations during iterations of gain mismatch calculations in order to balance clipping between the I and Q channel arms. Gain compensation coefficients are iteratively converged, clipping levels are established, and data flowing through the network is gain and clipping compensated. A compensation phase angle and phase compensation coefficients are then determined from gain and clipping compensated sample data. The resulting phase compensation coefficients are applied to the gain and clipping corrected receiver data to yield a gain, clipping, and phase compensated data stream.

Abstract: By a medical implant transceiver implantable within a body of a living organism, a portion of a signal is received from a medical controller transceiver external to the body of the living organism. Based on directions within the portion of the signal, a time duration is determined, after which a subsequent portion of the signal is to be transmitted from the medical controller transceiver. The directions include a value indicative of the time duration. The time duration differs based on the value. The subsequent portion is to be transmitted from the medical controller transceiver after an end of the portion. The medical implant transceiver enters into an inactive state for the time duration and awakens after the time duration has elapsed.

Abstract: System and method for signaling control information in a multi-carrier communications system to transmit data. A preferred embodiment comprises demodulating a first carrier that is used for transmitting a control channel transmission, determining a second carrier that is used for transmitting a data channel transmission based upon the demodulated control channel transmission, and demodulating the second carrier to obtain the data channel transmission. Additionally, designs for multi-carrier receivers are provided.

Abstract: Power optimization in a medical implant based system. A method includes receiving a portion of a signal by a first transceiver. The method further includes determining, from the portion of the signal, a time duration after which a subsequent portion of the signal will be transmitted. The subsequent portion is transmitted at end of the portion. The method also includes entering into an inactive state for the time duration.

Abstract: Demodulation and decoding for frequency modulation (FM) receivers with radio data system (RDS) or radio broadcast data system (RBDS). An example of a method for processing a signal in a receiver includes quantizing a demodulated signal to generate bits in response to receipt of the demodulated signal. The method also includes grouping the bits into one or more blocks. The method further includes computing a syndrome for a block from the one or more blocks. Moreover, the method includes identifying error, corresponding to the syndrome, in the block based on type of demodulation. The type of demodulation includes a coherent demodulation and a differential demodulation. Furthermore, the method includes correcting the error in the block.

Abstract: A method and apparatus for compensating a modulation imbalance effect in a communication device. In one embodiment, at least three sets of modulation imbalance parameters (MIPs) are estimated by executing an auto balance sequence. The at least three sets of MIPs correspond to a baseband signal configured to have at least three configurable frequencies, each of the at least three sets of MIPs corresponds to one of at least three configurable frequencies. The auto balance sequence is configured to provide an offset signal generated within a communication device to trigger generation of each one of the at least three configurable frequencies. The at least three sets of MIPs are filtered to select a filtered set. The modulation imbalance effect is compensated by using the filtered set to reduce distortion of the baseband signal in the communication device.

Abstract: A receiver in a packet based communication system includes a programmable block and a detection block that detects at least one of an operating condition of the receiver and a protocol condition of the communication system. Further, the receiver includes a control circuit coupled to the programmable block that controls the programmable block to transition to a set of radio modes according to at least one of the operating condition and the protocol condition.

Abstract: A transmitter and communication system are disclosed. A first component operable to determine an active interference cancellation value for each of a plurality of active interference cancellation tones and a protection-edge value for each of a plurality of protection-edge tones based on optimizing active interference cancellation, and further based on constraining an average power of the active interference cancellation values and the protection-edge values to less than or equal to a maximum power level, and on a plurality of data values. A second component is operable to transform a sequence of tones to a time domain signal, the sequence of tones comprised of the active interference cancellation tones, the protection-edge tones, and a plurality of data tones, the data tones containing the data values. A third component operable to transmit an orthogonal frequency division multiplex signal based on the time domain signal.

Abstract: Suppression of interference across transceivers integrated on a single semiconductor chip. An example of a method of reducing noise in a transceiver includes introducing an adjustable time delay into a signal between a first section of a signal path into which noise may be introduced and a second section of the signal path into which noise may be introduced. The method also includes selectively adjusting the time delay and signal polarity to improve a signal-to-noise metric of the transceiver. An example of the transceiver includes a transmitter and a receiver. The transceiver also includes an adjustable time delay between a first section of a transceiver signal path into which noise may be introduced and a second section of the transceiver signal path into which noise may be introduced and circuitry for reducing noise by adjusting a value of the time delay.

Abstract: System and method for providing multiple access in a multi-band, orthogonal frequency division multiplexed (multi-band-OFDM) communications system. A preferred embodiment comprises determining a transmission bandwidth to support a performance requirement and configuring transmission bands in the multi-band-OFDM communications system based upon the transmission bandwidth, wherein the transmission bands may be made up of smaller transmission bands bonded together. Further comprising initializing communications with the configured transmission bands. The use of bonded transmission bands can provide increased data rates and/or increased range performance.

Abstract: A method and apparatus for estimating Doppler channel in an Orthogonal Frequency-Division Multiplexor. The method includes selecting a continuation pilot, generating a channel estimation, filtering the continual pilot with at least one channel estimator, computing the error between the channel estimation and the filtered channel estimates, averaging the error across continual pilot carriers and over time, estimating noise variance, corrects average error utilizing the estimated noise variance to generate an estimate of the overall channel estimator error, and setting the filter cutoff to minimum estimation error.