Patent ID: 8494067

Claim:
A pilot transmission method in a wireless communication system, comprising: transmitting a first pilot for channel measurement through a first transmission section; transmitting a second pilot for the channel measurement through a second transmission section which is subsequent in time to the first transmission section, wherein the first transmission section and the second transmission section include a plurality of sub-bands, wherein a first portion of the plurality of sub-bands uses predetermined precoding and a second portion of the plurality of sub-bands uses non-predetermined precoding, wherein the transmission of the first pilot is carried on the second portion of the plurality of sub-bands, and wherein the transmission of the second pilot is carried on both first and second portions of the plurality of sub-bands, and receiving channel information on the plurality of sub-bands, wherein the channel information is at least one of a rank index (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), and channel state information (CSI).