Abstract: A receiving device comprises a signal detection unit, a reliability unit coupled to the signal detection unit and a decoding unit coupled to the signal detection unit and the reliability unit. The signal detection unit is for receiving a plurality of compensated symbols on a plurality of subcarriers, to generate a plurality of soft information and a plurality demodulated symbols of the plurality of compensated symbols according to the plurality of compensated symbols. The reliability unit is for generating a plurality of weights of the plurality of soft information according to a plurality of reliability information of the plurality of subcarriers. The decoding unit is for decoding the plurality of demodulated symbols according to the plurality of soft information and the plurality of weights, to generate a plurality of decoded bits.

Abstract: A method of cell search for a mobile device in a wireless communication system is provided. The method comprises performing a reception timing detection procedure, to obtain at least a possible reception time for a primary synchronization signal (PSS), performing a PSS hypothesis procedure, to generate three frequency-domain PSS sequences according to three root indexes each corresponding to a physical layer identity, and performing a secondary synchronization signal (SSS) coherent detection procedure, to calculate a SSS sequence according to each of the at least a possible reception time with the three frequency-domain PSS sequences, to obtain a physical layer cell identity group corresponding to the SSS sequence.

Abstract: The present invention includes a noise variance estimation circuit for wireless communication. An embodiment of the noise variance estimation circuit includes: a first estimation unit operable to generate a first estimation signal according to a reception signal and a reference signal in which the reception signal is derived from the equivalent of the reference signal; a first noise reduction unit operable to generate a first noise reduction signal by performing a first noise reduction process to the first estimation signal; a second estimation unit operable to generate a second estimation signal according to the difference between the first estimation signal and the first noise reduction signal; and a second noise reduction unit operable to execute a noise reduction adjustment according to the second estimation signal and perform a second noise reduction process to the first estimation signal in which the noise reduction adjustment affects the second noise reduction process.

Abstract: This invention discloses a wireless communication device and a method of determining a target set of transmission rates of the wireless communication device. The wireless communication device transmits data packets according to a plurality of transmission rates included in the target set of transmission rates. The method includes steps of: providing a plurality of candidate sets of transmission rates; transmitting a plurality of data packets according to a primary set of transmission rates; counting retry times of the data packets in a predetermined period of time and generating a counting result; and selecting one of the candidate sets of transmission rates according to the counting result to be the target set of transmission rates.

Abstract: A communication receiving end for receiving an inputted signal includes a signal amplifier for adjusting the inputted signal according to a first predetermined gain or a second predetermined gain to generate a first adjusted signal; an analog-to-digital converter (ADC), coupled to the signal amplifier, for converting the first adjusted signal; and a control unit, coupled to the ADC, for determining whether the ADC is saturated or not according to an output of the ADC. The first predetermined gain is associated with a first inputted signal power processed by the communication receiving end and a quantization noise of the ADC. The second predetermined gain is associated with a second inputted signal power processed by the communication receiving end and a full scale level of the ADC. The first inputted signal power is smaller than the second inputted signal power.

Abstract: A wireless communication apparatus for coupling to a multi-antenna module comprising a plurality of antennas, the wireless communication apparatus includes: a switching circuit, arranged for selectively changing the connected relations of the plurality of antennas according to a switching signal, so as to make the multi-antenna module generating a plurality of antenna combinations; and a receiving module, coupled to the switching circuit, including: a signal intensity measurement circuit, arranged for measuring signal intensity of a wireless packet received through the plurality of antenna combinations, so as to generate a plurality of measurement results; and an antenna switching determination circuit, during a training state, arranged for choosing a first comparison group comprising at least two antenna combinations from the plurality of antenna combinations for receiving the wireless packet, and determining a better antenna combination according to measurement results of the first comparing group.

Abstract: A channel map generation method includes: performing a power spectrum density detection on a plurality of channels in a frequency band, to generate a first channel map; and performing a first smoothing operation on the first channel map by a first window size to generate a second channel map. The first smoothing operation includes: grouping channels of the first channel map into a plurality of channel groups according to the first window size; and according to the number of good channels or bad channels in each of the channel group, deciding to retain channel determinations in the first channel map of the channel group, or re-designating all the channels of the channel group, so as to generate the second channel map.

Abstract: The present disclosure discloses a wireless communication device and method capable of adaptively permitting packet transmission or adjusting a threshold for packet transmission. An embodiment of said wireless communication device includes a reception circuit, a control circuit and a transmission circuit. The reception circuit measures signal energy, generates multiple energy measurement values, and generates multiple comparison results according to the energy measurement values and at least a threshold. The control circuit is operable to generate a transmission control signal according to the comparison results or to its derived information.

Abstract: An antenna diversity and beamforming coexistence method applied to a wireless communication device which supports both a transmitter/receiver (TX/RX) antenna diversity mechanism and a beamformer/beamformee mechanism includes the following steps: determining whether a plurality of wireless link partners linked to the wireless communication device respectively support the beamformer/beamformee mechanism and generating a determination result accordingly; and determining whether to enable/disable the TX/RX antenna diversity mechanism of the wireless communication device and to enable/disable the beamformer/beamformee mechanism of the wireless communication device according to the determination result; wherein when the beamformee mechanism is determined to be disabled, controlling the wireless communication device to transmit a default value in response to a received beamforming protocol packet.

Abstract: The present invention discloses a wireless transmission rate adjustment method for adjusting the wireless transmission rate of a wireless transmission device.

Abstract: A calibration method for calibrating a communication system includes: generating a test signal at a transmitter; configuring at least one calibration coefficient at the transmitter; configuring at least one calibration coefficient at the receiver; transmitting the test signal to a receiver via the calibration coefficient; performing a spectrum analysis upon the test signal received by the receiver to generate a spectrum analysis result; and adjusting the calibration coefficient according to the spectrum analysis result to calibrate the transmitter. In addition, a calibration method is also provided for calibrating a receiver of a communication system, and related calibration apparatuses are further provided.

Abstract: A wireless receiver includes a radio frequency (RF) receiving unit and a baseband receiving unit. A first path of the RF receiving includes a first filter, and is arranged for receiving an input RF signal and generating a first baseband input signal; a second path is arranged for receiving the input RF signal and generating a second baseband input signal. The baseband receiving unit is arranged for receiving the first baseband input signal and the second baseband input signal to generate a baseband decoded signal. One of the first path and the second path is an in-phase path, and the other is a quadrature-phase path. When the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path to receive the input RF signal.

Abstract: A channel selection method includes steps of generating a plurality of test carriers on a plurality of different candidate channels, respectively; obtaining a plurality of channel quality information corresponding to the plurality of test carriers, respectively; generating a test result according to the plurality of channel quality information; and selecting a target channel from the plurality of candidate channels according to the test result.

Abstract: A carrier frequency offset (CFO) calibration method for calibrating a CFO of a receiver is proposed. The CFO calibration method includes: receiving at least one CFO estimation value generated by digital CFO estimation; generating a CFO adjustment value according to the at least one CFO estimation value; and adjusting an oscillation frequency of an oscillator of the receiver according to the CFO adjustment value.

Abstract: The present disclosure discloses a wireless communication device and method capable of adaptively permitting packet transmission or adjusting a threshold for packet transmission. An embodiment of said wireless communication device includes a reception circuit, a control circuit and a transmission circuit. The reception circuit measures signal energy, generates multiple energy measurement values, and generates multiple comparison results according to the energy measurement values and at least a threshold. The control circuit is operable to generate a transmission control signal according to the comparison results or to its derived information.

Abstract: A wireless receiver includes a radio frequency (RF) receiving unit and a baseband receiving unit. A first path of the RF receiving includes a first filter, and is arranged for receiving an input RF signal and generating a first baseband input signal; a second path is arranged for receiving the input RF signal and generating a second baseband input signal. The baseband receiving unit is arranged for receiving the first baseband input signal and the second baseband input signal to generate a baseband decoded signal. One of the first path and the second path is an in-phase path, and the other is a quadrature-phase path. When the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path to receive the input RF signal.

Abstract: A wireless communication device is disclosed. The wireless communication device includes a frequency hopping communication circuit, a power spectral density circuit and a control circuit. The frequency hopping communication circuit includes a channel map. The frequency hopping communication circuit selects one of channel in a channel map to connect to another frequency hopping communication circuit according to the channel map. The power spectral density circuit for generating a power spectral density signal by measuring spectrums on all channels connected to the frequency hopping communication circuit. The control circuit receives the power spectral density and output statistical distribution data to the frequency hopping communication circuit. The frequency hopping communication circuit updates the channel map according to the statistical distribution data.

Abstract: A wireless transmission method for broadcasting packets to a plurality of receiving devices includes: broadcasting a plurality of packets to the receiving devices, receiving signals transmitted from the receiving devices, generating a plurality of estimation results according to the signals transmitted from the receiving devices where each of the estimation results corresponds to a receiving quality while each of the receiving devices receives the packets, determining whether each of the receiving devices is suitable for receiving the packets according to each of the estimation results and a recipient condition and storing information of at least one of the receiving devices suitable for receiving the packets, and determining whether the at least one of the receiving devices needs to receive a broadcasted packet again according to the information and signals transmitted from the at least one of the receiving devices suitable for receiving the packets.

Abstract: An antenna diversity and beamforming coexistence method applied to a wireless communication device which supports both a transmitter/receiver (TX/RX) antenna diversity mechanism and a beamformer/beamformee mechanism includes the following steps: determining whether a plurality of wireless link partners linked to the wireless communication device respectively support the beamformer/beamformee mechanism and generating a determination result accordingly; and determining whether to enable/disable the TX/RX antenna diversity mechanism of the wireless communication device and to enable/disable the beamformer/beamformee mechanism of the wireless communication device according to the determination result; wherein when the beamformee mechanism is determined to be disabled, controlling the wireless communication device to transmit a default value in response to a received beamforming protocol packet.

Abstract: This invention discloses a wireless communication device and a method of determining a target set of transmission rates of the wireless communication device. The wireless communication device transmits data packets according to a plurality of transmission rates included in the target set of transmission rates. The method includes steps of: providing a plurality of candidate sets of transmission rates; transmitting a plurality of data packets according to a primary set of transmission rates; counting retry times of the data packets in a predetermined period of time and generating a counting result; and selecting one of the candidate sets of transmission rates according to the counting result to be the target set of transmission rates.