Patent ID: 9184817
Filing Date: 2015-11-10
Classification: H04B

Abstract:
1. A method of generating a set of codebooks, the set of codebooks being suitable for a MIMO communication system in which a base station is configured with N t transmission antennas and the N t transmission antennas are configured in a uniform circular array, the set of codebooks comprising N t codebooks corresponding respectively to respective ranks, wherein the method comprises: determining the N wherein the first column of the Hadamard matrix D is all 1 or all −1, and the codebook of rank 1 is D(:,1) represents the first column of the Hadamard matrix D, diag(D(:,1)) represents a diagonal matrix with main diagonal elements being the first column of the Hadamard matrix D, R represents the radius of the uniform circular array, θ i represents an azimuth angle of the i th antenna, and λ represents the wavelength of the electromagnetic wave emitted from the base station.