Hybrid MU-MIMO spatial mapping using both explicit sounding and crosstalk tracking in a wireless local area network
摘要
說明書
WAP reception begins in the RF Stage 500B where uplink communications from one of the stations are received on each of the four antenna 512. These received communications are downconverted and supplied as input to the baseband stage 500A. In the baseband stage the received communications are then transformed from the time to the frequency domain in the discrete Fourier Transform (DFT) modules 514A-D from which they are output as discrete orthogonal frequency division multiplexed (OFDM) tones/sub-carriers/sub-channels 516A-D. The header portion of each received uplink packet, and specifically the training field therein, e.g. the VHT-LTF field, is used by the channel estimator 518A to estimate the frequency dependent distortions in the uplink channel and the updated channel information is passed to the equalizer 518B to cancel out any frequency dependent group or phase delay between the received OFDM tones/subchannels. The received communication streams are then demapped from constellation points to bits, deinterleaved, descrambled and decoded in the corresponding one of up to four demapper decoders 520A-D and then passed to the corresponding one of up to four packet disassemblers 522A-D, which output the received uplink communication.
