Abstract: Wireless receiver systems and methods for user equipment are described that employ multiple receiver heads. The multiple heads can receive wireless communication signals over different receive paths from different transmission sources. The systems can scan and monitor signal quality from all receiver heads during a scheduled gap in a communication link without interfering with an ongoing communication session.

Abstract: Wireless receiver systems and methods for user equipment are described that employ multiple receiver heads. The multiple heads can receive wireless communication signals over different receive paths from different transmission sources. The systems can scan and monitor signal quality from all receiver heads during a scheduled gap in a communication link without interfering with an ongoing communication session.

Abstract: Wireless receiver systems and methods for user equipment are described that employ multiple receiver heads. The multiple heads can receive wireless communication signals over different receive paths from different transmission sources. The systems can scan and monitor signal quality from all receiver heads during a scheduled gap in a communication link without interfering with an ongoing communication session.

Abstract: A channel estimation method estimates a data channel of a data resource element of a physical resource block in a time-frequency domain. The method includes: utilizing a detection circuit to perform a first physical resource block bundling detection in a first direction of the time-frequency domain to detect if at least one neighboring physical resource block is allowed to be bundled with the physical resource block, and accordingly generating a first physical resource block bundling detection result; determining a physical resource block processing range according to at least the first physical resource block bundling detection result, wherein at least the physical resource block is included in the physical resource block processing range; obtaining a plurality of pilot channels for pilot resource elements in the physical resource block processing range; and estimating the data channel of the data resource element according to the pilot channels.

Abstract: A channel estimation method estimates a data channel of a data resource element of a physical resource block in a time-frequency domain. The method includes: utilizing a detection circuit to perform a first physical resource block bundling detection in a first direction of the time-frequency domain to detect if at least one neighboring physical resource block is allowed to be bundled with the physical resource block, and accordingly generating a first physical resource block bundling detection result; determining a physical resource block processing range according to at least the first physical resource block bundling detection result, wherein at least the physical resource block is included in the physical resource block processing range; obtaining a plurality of pilot channels for pilot resource elements in the physical resource block processing range; and estimating the data channel of the data resource element according to the pilot channels.

Abstract: A method includes, during a first iteration of a first decoder for decoding convolutionally encoded data elements, determining a first value of a first path metric. The method also includes, during a second iteration of the first decoder, determining a second value of the first path metric by using the first value of the first path metric as an initial value of the first path metric.

Abstract: A system and method is provided for improved and efficient decoding of a received data sequence. The invention can perform the decoding using a LogMap function for a set of N inputs, where N is greater than 2.

Abstract: A method for clock calibration is provided. The method comprises receiving discontinuous reception period (DRX period) information from a base station, computing a calibration duration according to the discontinuous reception period and a clock error tolerance of a first clock, and when receiving paging information that informs of possible sent transmissions, calibrating the first clock with a second clock for a period of the calibration duration.

Abstract: A method includes, during a first iteration of a first decoder for decoding convolutionally encoded data elements, determining a first value of a first path metric. The method also includes, during a second iteration of the first decoder, determining a second value of the first path metric by using the first value of the first path metric as an initial value of the first path metric.

Abstract: A receiver of a CDMA system, receiving a signal transmitted through a multi-path channel, with a path alignment circuit is disclosed. The path alignment circuit has a pack-based memory device serially inputting samples of low over-sampling rate than that required by the CDMA system and outputting data packs pack by pack to reduce access rate of the memory device. In addition, the path alignment circuit has an interpolation device which reads the data packs from the memory device and performs interpolation to raise the resolution of the low over-sampling samples and generate interpolated samples of high resolution for de-spreading requirement of the CDMA system.

Abstract: A system and method is provided for improved and efficient forward and backward recursive computations that may be used, for example, with turbo code decoding applications. The invention performs the forward computations using a full length of a sequence to be decoded and performs the reverse computations using a sliding window over the sequence.

Abstract: A method for clock calibration is provided. The method comprises receiving discontinuous reception period (DRX period) information from a base station, computing a calibration duration according to the discontinuous reception period and a clock error tolerance of a first clock, and when receiving paging information that informs of possible sent transmissions, calibrating the first clock with a second clock for a period of the calibration duration.

Abstract: A system and method is provided for improved and efficient forward and backward recursive computations that may be used, for example, with turbo code decoding applications. The invention performs the forward computations using a full length of a sequence to be decoded and performs the reverse computations using a sliding window over the sequence.

Abstract: Methods and apparatuses process a communication signal to detect a burst packet comprising an access code. The method comprises deriving a differential phase signal indicating differential phases of a first set of the access code in the communication signal, and comparing the differential phase signal with an ideal differential phase signal to calculate a frequency offset value, compensating the differential phase signal by the frequency offset value to generate a compensated differential phase signal, and detecting a burst packet transmitted via the communication signal according to the compensated differential phase signal.

Abstract: A method and apparatus for data transmission are provided. Data values of a plurality of channels are transformed into a transmission signal. An enhanced shaping filter is provided to shape a binary stream of only single digits and generate a shaped signal. A weighting unit is coupled to the output of the shaping filter, weighting the shaped signal to effectively generate a quality baseband signal. The binary stream is converted from the data values through spreading and scrambling. A scrambling unit, scrambles the binary stream with scrambling codes. A spreading unit spreads the binary stream at a chip rate before sending the binary to the scrambling unit.

Abstract: A detector for detecting a received signal according to a Gaussian shift keying (“GFSK/GMSK”) modulation scheme. The detector may enhance a detection performance of the receiver while limiting one or more implementation impacts. An implementation impact may include an implementation complexity impact, an implementation cost impact, or other impacts. The detection performance of the detector may be enhanced in relation to one or more performance aspects, such as, an ISI aspect, an AWGN aspect, a co-channel interference aspect, a sensitivity aspect, an error propagation aspect, or other aspects. The detector may be configured or reconfigured to enhance one or more particular performance aspects. The enhancement of the particular performance aspects may affect, adversely or otherwise, one or more related performance aspects that may be related to the particular performance aspects. The detector may be configured or reconfigured according to a current application of the detector.

Abstract: A multiple stage matched filter for a wireless receiver comprises a receiver configured to develop a received signal, the received signal comprising a bit stream of signal samples, and a multiple stage matched filter configured to parallel process the received signal such that multiple codes are analyzed simultaneously to determine a frequency offset and code location.

Abstract: A receiver of a CDMA system, receiving a signal transmitted through a multi-path channel, with a path alignment circuit is disclosed. The path alignment circuit has a pack-based memory device serially inputting samples of low over-sampling rate than that required by the CDMA system and outputting data packs pack by pack to reduce access rate of the memory device. In addition, the path alignment circuit has an interpolation device which reads the data packs from the memory device and performs interpolation to raise the resolution of the low over-sampling samples and generate interpolated samples of high resolution for de-spreading requirement of the CDMA system.

Abstract: Methods and systems with different control rates for uplink and downlink oscillators. The method comprises obtaining the frequency offsets between a receiver oscillator frequency and a carrier frequency of received signals, adjusting the receiver oscillator frequency at a first rate according to the frequency offsets, and adjusting the transmitter oscillator at a second rate according to the first rate. The receiver oscillator frequency is adjusted according to filtered frequency offsets, while the transmitter oscillator frequency is adjusted according to the frequency offsets and smoothed frequency offsets.

Abstract: A channel estimation system is disclosed. The channel estimation system comprises a first memory element having a write function and a plurality of read functions, a pilot signal extraction element adapted to receive a first output of the first memory element, a programmable averaging element adapted to receive the output of the pilot signal extraction element, and a combiner adapted to receive a second output of the memory element and the output of the programmable averaging element, wherein the second output of the first memory element is delayed with respect to the first output of the first memory element.