Patent Document ID: 20150263799
Application ID: 14215798
Patent Flag: 0

Claim One:
1. A method of precoding in a two transmit antenna Multiple Input Multiple Output (MIMO) fixed wireless backhaul network, the method comprising: at a receiver of a first wireless station: receiving a signal transmitted by two antennas of a transmitter of a second wireless station; determining a 2×2 precoding matrix from the received signal based on singular value decomposition (SVD); determining a first column of the 2×2 precoder matrix; feeding back to the second wireless station the two complex entries of the first column of the 2×2 precoder matrix of at least one subcarrier using a finite precision format; at a receiver of the second wireless station, receiving a signal comprising the values of the two complex entries of the first column of the 2×2 precoder matrix; interpolating from the received values the first column entries for every subcarrier using linear interpolation; normalizing the sum of the absolute value squares of the first column entries of the precoder matrix; re-constructing the second column entries of the precoder matrix using negative conjugate and conjugate of the values of the first column entries; and applying the resulting precoder matrix to modulate data signals transmitted from the transmitter of the second station to receiver of the first station.