Patent ID: 8548088
Filing Date: 2013-10-01
Classification: H04L

Abstract:
1. A data transmission method for a Multiple-Input Multiple-Output (MIMO) wireless access system using a plurality of sub-carriers, the method comprising: determining, by a base station, a precoding matrix [W], the precoding matrix [W] being a part of a phase-shift-based precoding matrix [P]; determining, by the base station, a first diagonal matrix [D determining, by the base station, a unitary matrix [U], the unitary matrix [U] being a part of the phase-shift-based precoding matrix [P]; precoding, by the base station, a transmission symbol per resource using the phase-shift-based precoding matrix [P] to generate precoded data; and transmitting, by the base station, the precoded data to a mobile station, wherein the phase-shift-based precoding matrix [P] is determined by a product of the precoding matrix [W], a Hermitian matrix of the unitary matrix [U