Patent ID: 8432982

Claim:
A method for transmitting a midamble by a multiple antenna transmitting device in a wireless communication system, the method comprising: determining a pattern for a midamble including null subcarriers and pilot subcarriers, wherein each of the pilot subcarriers corresponds to one of a plurality of pilot signals, and each of the plurality of pilot signals corresponds to a different one of a plurality of transmit antennas; and transmitting the pilot signals in corresponding pilot subcarriers based on the determined pattern, wherein the pilot signals are transmitted in an Orthogonal Frequency Division Multiplexing (OFDM) symbol of a resource block comprising a plurality of subcarriers and a plurality of OFDM symbols, wherein the determining of the pattern for the midamble comprises determining locations for the pilot subcarriers in the midamble, and wherein the determining of the locations for the pilot subcarriers in the midamble comprises determining the locations for the pilot subcarriers in the midamble based on an antenna index, a cell identity, and a subcarrier index.