Patent ID: 8139665

Claim:
A method of signal processing at a wireless communication device, comprising: receiving an orthogonal frequency division multiple access (OFDMA) signal transmitted from a multiple input/multiple output (MIMO) antenna system, wherein the OFDMA signal is received by using one or more resource blocks, each resource block being in a form of an 18*5 matrix representing 18 subcarriers and 5 OFDMA symbols; and performing channel estimation based on four pilot signals corresponding to four streams, wherein the four pilot signals are distributed across only a 1 st , 2 nd , 4 th and 5 th OFDMA symbol of the 5 OFDMA symbols, wherein, within each of the 1 st , 2 nd , 4 th and 5 th OFDMA symbols, a first occurring pilot subcarrier and a second occurring pilot subcarrier are separated by 4 subcarriers, the second occurring pilot subcarrier and a third occurring pilot subcarrier are separated by 6 subcarriers, and the third occurring pilot subcarrier and a fourth occurring pilot subcarrier are separated by 4 subcarriers, and wherein, within each of the 1 st , 2 nd , 4 th and 5 th OFDMA symbols, the first to fourth occurring pilot subcarriers are corresponding to the four streams.