A method and system for providing sub-band whitening are herein provided. According to one embodiment, a method estimating an interference whitening (IW) factor based on a legacy-long training field (LLTF) signal, updating the estimated IW factor during transmission of a data symbol, and scaling the data symbol based on the updated IW factor and the estimated IW factor.

A receiving apparatus includes: a first pulse noise determining circuit configured to determine the presence or the absence of pulse noise in the receiving signal based on a first threshold; a first pulse noise removing circuit configured to remove pulse noise in the receiving signal based on the result of the determination made by the first pulse noise determining circuit; a bandwidth limiting filter configured to limit a receiving signal whose pulse noise has been removed by the first pulse noise removing circuit to a predetermined bandwidth; a second pulse noise determining circuit configured to determine the presence or the absence of pulse noise in the receiving signal whose bandwidth has been limited by the bandwidth limiting filter based on a second threshold; and a threshold control circuit configured to adjust a first threshold based on the result of the determination made by the second pulse noise determining circuit.

A method and system for providing sub-band whitening are herein provided. According to one embodiment, a method estimating an interference whitening (IW) factor based on a legacy-long training field (LLTF) signal, updating the estimated IW factor during transmission of a data symbol, and scaling the data symbol based on the updated IW factor and the estimated IW factor.

A method and apparatus for processing a signal to generate equalizer codes, which are used to control equalization of the signal, that comprises processing the signal to identify the eyes of the signal, and for each eye, calculating an eye height and calculating a noise value. For each eye, squaring the eye height to generate an eye height product and dividing the eye height product by the noise value to generate a Q.sup.2 value. Using the calculated Q.sup.2 values optimizing, through adaptation, the equalizer codes. Calculating the noise values may include calculating an ISI value for each band of the signal and then calculating the eye height for each eye as the difference between the adjacent upper average value and the adjacent lower average value. Then, for each eye, calculating a noise value by summing the ISI value for the band above the eye and the band below the eye.

Embodiments of the present disclosure provide methods and apparatus for detection of radio signal. A method performed by a reception apparatus may comprise: obtaining (S101) time domain samples of a radio signal; processing (S102) the time domain samples by a plurality of match filters respectively, to generate a plurality of filtered results of the time domain samples; classifying (S103) a filtered result of the plurality of filtered results by a classifier; discarding (S104) a filtered result classified as being not associated to the code sequence; and determining (S105) whether the code sequence is used in the radio signal, when a filtered result of the radio signal is classified as being associated to the code sequence. Some processing procedures may be avoided based on the classification result of the detected radio signal, and computational complexity may be reduced.

A method and system for providing sub-band whitening are herein provided. According to one embodiment, a method estimating an interference whitening (IW) factor based on a legacy-long training field (LLTF) signal, updating the estimated IW factor during transmission of a data symbol, and scaling the data symbol based on the updated IW factor and the estimated IW factor.

A receiving apparatus includes: a first pulse noise determining circuit configured to determine the presence or the absence of pulse noise in the receiving signal based on a first threshold; a first pulse noise removing circuit configured to remove pulse noise in the receiving signal based on the result of the determination made by the first pulse noise determining circuit; a bandwidth limiting filter configured to limit a receiving signal whose pulse noise has been removed by the first pulse noise removing circuit to a predetermined bandwidth; a second pulse noise determining circuit configured to determine the presence or the absence of pulse noise in the receiving signal whose bandwidth has been limited by the bandwidth limiting filter based on a second threshold; and a threshold control circuit configured to adjust a first threshold based on the result of the determination made by the second pulse noise determining circuit.

Apparatus and methods are provided for noise-whitening post-compensation in a receiver. A first apparatus includes a first whitening filter configured to filter a received signal comprising symbols to generate a first filtered signal. The first apparatus further includes a first decision feedback equalizer having an input coupled to an output of the first whitening filter to receive the first filtered signal. The first decision feedback equalizer is configured to apply decision feedback equalization to the first filtered signal to generate estimates for the symbols of the received signal. A second apparatus includes a decision device configured to generate a symbols decision based on a received signal comprising symbols, a noise predictor configured to predict noise in the received signal, and a subtractor configured to subtract the predicted noise from the received signal to generate a symbols estimate.

A filtering device includes a low-pass filter (LPF), a noise estimation circuit and a first combining circuit. The LPF receives and filters a pre-filtering signal to generate an output signal of the filtering device. The noise estimation circuit estimates an estimated noise signal according to the output signal and the pre-filtering signal. The first combining circuit subtracts the estimated noise signal from an input signal of the filtering device to generate the pre-filtering signal.

This disclosure describes a receiver having equalization with noise de-whitening mitigation for wireless communication. An input port receives, via an antenna, a signal communicated over a wireless communication link, the signal comprising a noise component. Control circuitry performs zero forcing equalization of the received signal to generate a zero forcing equalization result signal. The zero forcing equalization causes de-whitening of the noise component by increasing a correlation among elements of the noise component. The control circuitry mitigates the de-whitening of the noise component by: determining a noise variance value based on channel properties of the wireless communication link, and modifying the zero forcing equalization result signal based on the noise variance value. The modified zero forcing equalization result signal is communicated, via an output port, to log-likelihood ratio (LLR) generation circuitry for LLR computation.