the two antennas even though they are independent add constructive and thereby mitigate the effect of some fading environments in another embodiment as an alternative to a predetermined progression of phase offset a time varying phase offset scheme may be controlled by the receiver processor 110 via the feedback channel 112 in the simplest implementation a single bit from the receiver processor 110 is used by the transmitter processor 102 to determine whether to offset the standard symbol constellation by a predetermined amount in the positive clockwise or negative counterclockwise direction where the use of a constant or predictably time variable phase offset has limitations outlined hereinbefore these limitations may be overcome by instead randomizing the phase offset the randomizing of the phase offset may be arranged to uniformly distribute the phase offset over the course of an fec block advantageously the randomness need not be reconstructed at the receiver however a random phase offset is applied to the estimated channel consequently the channel appears to have a random phase component even in an los environment and the symbols transmitted by each antenna may be determined to the receiver processor 110 the received signal appears to have been transmitted over a channel with a phase that has a random frequency response additionally such a signal design does not require the feedback channel 112 fig7 illustrates a transmitter processor 702 for a known orthogonal frequency division multiplexing ofdm mimo system where the rest of the ofdm mimo system may appear as illustrated in fig1 data to be transmitted is received at a qam mapper 704 this data is coded and modulated by the qam mapper 704 and qam symbols are produced as an.