Techniques for channel estimation in millimeter-wave communication systems
Disclosed is an apparatus, computer implemented method and method for preforming channel estimation in a millimeter wave wireless communication system which includes receiving complementary sequences at a receiver of the millimeter wave wireless communication system; estimating a channel estimation of a channel among the received complementary sequences; estimating a signal-to-noise ratio (SNR) estimation of the channel; detecting a maximum channel response value of the channel estimation; computing a de-noised threshold value from the maximum channel response value and the SNR estimation of the channel; comparing the de-noised threshold value to the channel estimation to detect a last valid tap of a channel impulse response; and zeroing out all the taps after the detected last valid tap of the channel impulse response.
1. A method for wireless communication, comprising:
receiving complementary sequences;
estimating a channel estimation of a channel based on the received complementary sequences;
estimating a signal-to-noise ratio (SNR) estimation of the channel;
detecting a maximum channel response of the channel estimation;
computing a de-noised threshold based on the maximum channel response and the SNR estimation of the channel, wherein the de-noised threshold is computed by dividing the maximum channel response by the SNR estimation of the channel, and multiplying a resulting quotient by a threshold noise, wherein the threshold noise is representative of a known additive noise;
comparing the de-noised threshold to the channel estimation to detect a last valid tap of a channel impulse response; and
zeroing out one or more taps of the channel impulse response if the one or more taps are after the detected last valid tap of the channel impulse response.
2. The method of claim 1 , wherein the complementary sequences are Golay complementary sequences.
3. The method of claim 1 , wherein estimating the channel estimation further comprises:
cross-correlating the received complementary sequences with a set of complementary sequences.
4. The method of claim 1 , wherein the SNR estimation is estimated by subtracting two subsequent IEEE 802.11ad preambles.
5. The method of claim 1 , wherein the SNR estimation is estimated based on the strength of the received complementary sequences and the channel estimation.
6. An apparatus for wireless communication, comprising:
radio frequency (RF) circuitry configured to cause the apparatus to receive complementary sequences;
baseband circuitry configured to cause the apparatus to:
estimate a channel estimation of a channel based on the received complementary sequences;
estimate a signal-to-noise ratio (SNR) estimation of the channel;
detect a maximum channel response of the channel estimation;
compute a de-noised threshold based on the maximum channel response and the SNR estimation of the channel, wherein the de-noised threshold is computed by dividing the maximum channel response by the SNR estimation of the channel, and multiplying a resulting quotient by a threshold noise, wherein the threshold noise is representative of a known additive noise;
compare the de-noised threshold to the channel estimation to detect a last valid tap of a channel impulse response; and
zero out one or more taps of the channel impulse response if the one or more taps are after the detected last valid tap of the channel impulse response.
7. The apparatus of claim 6 , wherein the complementary sequences are Golay complementary sequences.
8. The apparatus of claim 6 , wherein the baseband circuitry is further configured to:
cross-correlate the received complementary sequences with a predefined set of complementary sequences.
9. The apparatus of claim 6 , further comprising a receiver configured to receive the complementary sequences, wherein the receiver is configured to operate at a 60 GHz frequency band in accordance with the IEEE 802.11ad standard.
10. The apparatus of claim 9 , wherein the receiver is coupled to an electronic device configured to support applications which operate at the 60 GHz frequency band in compliance with the IEEE 802.11ad standard.
11. A computing device, comprising:
an antenna;
radio frequency (RF) circuitry configured to cause the apparatus to receive complementary sequences via the antenna; and
baseband circuitry configured to cause the apparatus to:
estimate a channel estimation of a channel based on the received complementary sequences;
estimate a signal-to-noise ratio (SNR) estimation of the channel;
detect a maximum channel response of the channel estimation;
compute a de-noised threshold based on the maximum channel response and the SNR estimation of the channel, wherein the de-noised threshold is computed by dividing the maximum channel response by the SNR estimation of the channel, and multiplying a resulting quotient by a threshold noise, wherein the threshold noise is representative of a known additive noise;
compare the de-noised threshold to the channel estimation to detect a last valid tap of a channel impulse response; and
zero out one or more taps of the channel impulse response if the one or more taps are after the detected last valid tap of the channel impulse response.