Patent ID: 8194720
Filing Date: 2012-06-05
Classification: H04B,H04L

Abstract:
1. A wireless communication system which performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas, N being an integer of 2 or more and M being an integer of 1 or more, the system comprising: notifying means for notifying the first terminal of a maximum dimension N training means for transmitting a sounding packet including training sequence for exciting a channel corresponding to the maximum dimension N channel matrix estimation means for dividing the training sequence received by the antennas of the second terminal into N beamforming information feedback means for preparing beamforming information necessary for calculating a transmission weight matrix for beamforming in the first terminal on the basis of the channel matrix estimated in the second terminal and feeding back the beamforming information from the second terminal to the first terminal; transmission weight matrix setting means for setting the transmission weight matrix for beamforming at a time of transmitting data from the first terminal to the second terminal on the basis of the beamforming information fed back from the second terminal to the first terminal; and beamforming means for performing beamforming in transmission signals of the antennas of the first terminal using the transmission weight matrix for beamforming when a data packet is transmitted from the first terminal to the second terminal.