Patent ID: 8411785

Claim:
A method to achieve full diversity without sacrificing bandwidth and with a linear complexity in a wireless system comprising: orthogonally transmitting a plurality of signals utilizing multiple antennas using a corresponding plurality of precoders in a plurality of time slots, which precoders are designed using the channel information to cancel interference among the plurality of signals while achieving a diversity of NM with low complexity for at least two users each having N transmit antennas and one receiver with M receive antennas; separating the signals in the receiver using the orthogonality of the transmitted signals; and decoding the signals independently to provide diversity of NM to the at least two users; where orthogonally transmitting a plurality of signals utilizing multiple antennas using a corresponding plurality of precoders comprises: determining for each time slot of transmission an equivalent channel equation characterized by a channel matrix {tilde over (H)} and a noise vector ñ for the at least two users; generating an orthogonal structure of signal vectors in corresponding precoders for the at least two users by utilizing a quasi-orthogonal design comprised of a subspace 1 created by the first two columns of matrix {tilde over (H)} orthogonal to a subspace 2 created by the second two columns of matrix {tilde over (H)}.