Patent ID: 8768246
Filing Date: 2014-07-01
Classification: H04B,H04L,H04W

Abstract:
1. A wireless communication apparatus including a first number of antennas for transmitting spatially multiplexed streams to a receiver including a second number of antennas, the first number being an integer equal to or greater than two, and the second number being an integer equal to or greater than one, the apparatus comprising: notifying means for notifying the receiver of a maximum dimension when computing a transmission weight matrix for beamforming, the maximum dimension being an integer equal to or less than the first number; training means for transmitting a packet including a training sequence to the receiver, the training sequence corresponding to the first number of antennas of the apparatus and the second number of antennas of the receiver; channel information receiving means for receiving channel information including a channel matrix, the channel matrix having a third number of rows and the first number of columns, the third number being equal to or less than the maximum dimension when computing the transmission weight matrix for beamforming fed back from the receiver; transmission weight matrix computation means for computing a transmission weight matrix for beamforming when transmitting data to the receiver using the channel matrix having the third number of rows and the first number columns received by the channel information receiving means; and packet transmitting means for beamforming signals to be transmitted via the antennas of the apparatus using the transmission weight matrix for beamforming, and transmitting a data packet to the receiver according to the signals to be transmitted.