Hybrid MU-MIMO spatial mapping using both explicit sounding and crosstalk tracking in a wireless local area network
摘要
說明書
Stations eligible for an MU-MIMO downlink may have from one or more antennas. In the example shown the stations each have only one antenna, though that need not be the case. Station reception in station 302A begins in the RF Stage 572B where downlink communications from the WAP are received on the antenna 570. These received communications are downconverted and supplied as input to the baseband stage 572A. In the baseband stage the received communications are then transformed from the time to the frequency domain in the DFT module 574 from which they are output as discrete orthogonal frequency division multiplexed (OFDM) tones/sub-carriers/sub-channels 574A. The header portion of each received downlink packet, and specifically the training field therein, e.g. the VHT-LTF field, is used by the channel estimator 576A to estimate the frequency dependent distortions in the downlink channel and the updated channel information is passed to the equalizer 576B to remove phase and amplitude distortions caused by the channel. The received communication stream is then demapped from constellation points to bits, deinterleaved, descrambled and decoded in the demapper decoder 578 and then passed to the packet disassembler 580, which outputs the received uplink communication.
