Patent ID: 8520494

Claim:
A method for uplink transmission via multiple antennas by a user equipment in a radio communication system, the method comprising: receiving scheduling information and precoding matrix indicator (PMI) information for the uplink transmission from a base station, wherein a plurality of clusters including a first cluster and a second cluster are scheduled for the uplink transmission by the scheduling information, and the PMI information includes a plurality of PMI fields including a first PMI field indicating a first precoding matrix and a second PMI field indicating a second precoding matrix being different from the first precoding matrix; performing Fourier transform on one or more data sequences to generate a first plurality of frequency-domain sequences, wherein each frequency-domain sequence of the first plurality of frequency-domain sequences includes a first portion corresponding to a first cluster and a second portion corresponding to a second cluster; precoding the first plurality of frequency-domain sequences to generate a second plurality of frequency-domain sequences, wherein the first portion is precoded with the first precoding matrix and the second portion is precoded with the second precoding matrix; performing inverse Fourier transform on the second plurality of frequency-domain sequences to generate one or more transmission symbols; and transmitting the one or more transmission symbols via the multiple antennas.