Patent ID: 8139667

Claim:
A method for estimating a channel in a collaborative spatial multiplexing system, the method comprising: receiving a composite signal comprising a first signal of a first mobile station and a second signal of a second mobile station, the composite signal comprising a tile having a plurality of data sub-carriers, a plurality of first pilot sub-carriers of the first mobile station, and a plurality of second pilot sub-carriers of the second mobile station; estimating a total phase offset of the first mobile station based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers of the first mobile station; estimating a first phase offset of the first mobile station based on a power delay profile (PDP) of at least one of the plurality of first pilot sub-carriers of the first mobile station; estimating a second phase offset of the first mobile station based on the difference between the total phase offset and the first phase offset; determining a combined phase offset for a plurality of data sub-carriers for the first mobile station and the plurality of first pilot sub-carriers of the first mobile station based on a weighted sum of the first phase offset and the second phase offset; and determining a channel estimate of the tile for the first mobile station based on the combined phase offset and the first pilot sub-carriers of the first mobile station.