Patent ID: 8290074

Claim:
A method for communicating symbols in a network including a transmitter and a receiver, wherein the network uses orthogonal frequency division multiplexing (OFDM), wherein the transmitter has a set of transmit antenna, and wherein the receiver has a set of receive antennas, comprising: storing a set of pseudo random sequences (PRS) at the transmitter and the receiver; mapping each symbol to subcarriers for the set of transmit antennas to produce a mapped symbol; encoding the mapped symbol using a pseudo-random phase precoder (PRPP) and the PRS to produce a precoded symbol, wherein the PRPP uses a K-by-K pseudo-random phase precoding (PRPP) matrix W n at time n, where a number of channels is K, p denotes a row index and q denotes a column index of the matrix W n , and an element (p, q) in the matrix W n is exp(j*Î¸(p, q))/âˆš{square root over (K)}, where Î¸(p, q) is a pseudo-randomly phase generated by the PRS uniformly distributed between âˆ’Ï€ and Ï€; applying an inverse fast Fourier transform (IFFT) to the precoded symbol; and transmitting the encoded symbol to the receiver using the set of transmit antennas.