| 主权项 |
1. A method for transmitting a beamforming matrix of a subcarrier on a channel of a Multiple Input Multiple Output (MIMO) channel of a MIMO system by a transmitter in response to a feedback request from a receiver for obtaining channel information in the MIMO system, comprising:
determining, by the transmitter, a maximum value mv(k) of a real part and an imaginary part of elements in a subcarrier's beamforming matrix V(k); determining, by the transmitter, an M bits quantization of mv(k); determining, by the transmitter, a quantization amplitude Mv(k), M being a positive integer, wherein no division calculation is performed on mv(k) to determine Mv(k); determining, by the transmitter, a linear part Mvlin(k) of Mv(k), wherein no division calculation is performed on mv(k) to determine the linear part Mvlin(k) of Mv(k); determining, by the transmitter, a Nb bits quantization of a real part and imaginary part of every element in V(k) by Mvlin(k); determining, by the transmitter, a quantized beamforming matrix Vq(k), Nb being a positive integer, whereinV(m,l)q(R)=sign(V(m,l)(k))*min(2Nb-1-1,round(Re(V(m,l)(k))Mvlin(k)-c(2Nb-1-1)));V(m,l)q(I)=sign(V(m,l)(k))*min(2Nb-1-1,round(Im(V(m,l)(k))Mvlin(k)-c(2Nb-1-1))); V(m,l)(k) representing an element in V(k); V(m,l)q(R) representing a real part of quantized V(m,l)(k); V(m,l)q(I) representing an imaginary part of quantized V(m,l)(k); m being a row position reference, l being a column position reference; sign(V(m,l)(k)) representing a polarity symbols of V(m,l)(k);min(2Nb−1−1,round(Re(V(m,l)(k))Mvlin(k)-c(2Nb-1-1)))representing a minimum value of (2Nb−1−1) andround(Re(V(m,l)(k))Mvlin(k)-c(2Nb-1-1));round representing a rounding operation;“| |” representing an absolute operation; and c being a positive real number; and
transmitting, by the transmitter, said quantization amplitude Mv(k) and said quantized beamforming matrix Vq(k). |
