Patent ID: 8964882
Filing Date: 2015-02-24
Classification: H04B,H04L

Abstract:
1. A method for determining a precoding matrix for sub-band precoding for a transmitter, wherein the transmitter is to be associated with at least two sets of cross-polarized antennas with different polarization directions, wherein channel vectors of the two sets of antennas are H 1 and H 2 respectively, the two sets of antennas are closely spaced, M is the amount of the transmitting antennas, r is the amount of the data flows, and the channel vectors H 1 and H 2 of the two sets of antennas satisfy the following complex relationship: Wherein β is the amplitude of the complex relationship between the two channel vectors, and δ is the angle of the complex relationship between the two channel vectors; the method comprising: determining, according to long-term channel related information, an optimized first matrix W wherein, R is a proximity of the transmitting space correlation matrix of H multiplying the optimized first matrix W wherein, W selecting a precoding matrix from the plurality of candidate precoding matrices for precoding the data to be transmitted based on predefined rules, according to the short-term channel properties, thereby selecting an optimized precoding matrix.