A method for minimizing a time domain mean square error (MSE) of channel estimation (CE) includes estimating, by a processor, a power delay profile (PDP) from a time domain observation of reference signal (RS) channels; estimating, by the processor, a noise variance of the RS channels; and determining, by the processor, a first arrival path (FAP) value and a delay spread estimation (DSE) value based on the estimated PDP and the estimated noise variance for minimizing the MSE of CE.

A transmitting device includes: a transmission signal generation circuit that generates a transmission signal using a frame format including a legacy short training field (STF), a legacy channel estimation field (CEF), a legacy header field, an enhanced directional multi-gigabit (EDMG) header field, an EDMG-STF, an EDMG-CEF, and a data field; and a transmission circuit that transmits the generated transmission signal using one or more channels, wherein the legacy header field includes a data length field expressed by multiple bits, and the data length field indicates, to a legacy terminal, information related to a data length using all of the multiple bits, and indicates, to an EDMG terminal, information related to a data length using a subset of the multiple bits, and uses the remaining bit or bits to indicate information related to the one or more channels in which the transmission signal is transmitted.

A device includes a receiver having analog front-end circuitry and a digital signal processing (DSP) circuit. The DSP circuit is configured to select one of a plurality of digital equalization (DEQ) filter options and to perform DEQ operations based on the selected DEQ filter option, wherein the DSP circuit is configured to select one of the plurality of DEQ filter options based on a channel length estimate and a plurality of different sets of DEQ filter coefficients predetermined for different channel lengths.

This disclosure relates to techniques for selecting operational modes of a wireless device. The operational mode may be selected based on determining the presence or absence of reference symbols. A low power mode may be selected when the presence or absence of reference symbols suggests that a control channel used by the wireless device may not be present.

A device includes a receiver having analog front-end circuitry and a digital signal processing (DSP) circuit. The DSP circuit is configured to select one of a plurality of digital equalization (DEQ) filter options and to perform DEQ operations based on the selected DEQ filter option, wherein the DSP circuit is configured to select one of the plurality of DEQ filter options based on a channel length estimate and a plurality of different sets of DEQ filter coefficients predetermined for different channel lengths.

Embodiments of the present disclosure include an OFDM receiver circuit, which includes an FFT circuit configured to calculate an FFT of a plurality of sample values received by the receiver circuit, and a smoothing circuit configured to identify equalizer coefficients for the sample values by truncating portions of an impulse response of the FFT.

Mechanisms for determining directional beamforming weights are disclosed. A method performed by a radio transceiver device includes obtaining, from measurements on reference signals, channel estimates per antenna port and frequency. The channel estimates are indicative of power delay values per antenna port towards another radio transceiver device. The method includes determining modified channel estimates per antenna port and frequency with the power delay values outside a threshold delay window being suppressed. The method includes determining directional beamforming weights for beam-formed transmission towards said another radio transceiver device based on the modified channel estimates per antenna port and frequency.

A method, a system, and a computer program product for determining a location of a communication device. Data corresponding to a detected transmission of a data packet between a tag device and one or more communication devices is received on one or more communication channels. At least one of a channel state information and a signal strength associated with the detected transmission for each frequency band in a plurality of frequency bands are determined. Based on the determined channel state information, one or more lengths of signal paths corresponding to the detected transmission of the data packet are determined. A shortest length in across one or more communication devices is selected to determine a location of the tag device.

A symbol rate determination method for determining a symbol rate of an input signal is disclosed. The method comprises: receiving the input signal; determining respective pulse widths of pulses contained in the input signal; allocating the pulse widths to groups based on a magnitude of the respective pulse widths; determining a group pulse width for each of the groups, the group pulse width being representative of the pulse widths contained in the respective group; and determining the symbol rate based on the determined group pulse widths. Moreover, a measurement instrument for determining a symbol rate of an input signal is disclosed.

A maximum likelihood sequence estimation circuit includes: a signal extraction unit that estimates a reception sample signal including a preceding wave component and a reception sample signal including a delayed wave component from a plurality of reception sample signals sampled from a reception signal at sample intervals shorter than symbol intervals, and extracts, based on an estimation result, both first reception sample signals and second reception sample signals from the plurality of reception sample signals at the symbol intervals; and a maximum likelihood sequence estimation unit that estimates a maximum likelihood sequence using the first reception sample signals extracted and the second reception sample signals extracted.