Feedback of the channel information for transmit beamforming in WLAN

In this paper an efficient feedback quantization technic for beamforming in MIMO systems is presented. The proposed technic named time domain quantization TD-Q is based on the feed back of time domain parameters necessary for the reproduction of the beamforming matrix at the transmitter. This TD-Q reaches the same sum rate capacity than the conventional Givens rotation quantization GR-Q and requires less amount of feedback. The quantization error effect on the sum rate capacity and amount of feedback of the proposed TD-Q are studied and compared with the GR-Q in IEEE 802.11ac context.