Patent ID: 7751495

Claim:
A wireless transmitter for transmitting signals to one or more receivers, the wireless transmitter comprising: two or more transmission antennas; a symbol encoder unit that produces two or more encoded spatial data streams wherein the number of the encoded spatial data streams is different than the number of the transmission antennas to be used to transmit the encoded spatial data streams; and a spatial spreading unit coupled between the symbol encoder unit and the transmission antennas, the spatial spreading unit including a spatial spreading matrix to distribute the two or more encoded spatial data streams to the transmission antennas for transmission; wherein the spatial spreading matrix has components associated with each row of a row dimension having a number of rows equal to the number of the transmission antennas to be used to transmit the encoded spatial data streams and associated with each column of a column dimension having a number of columns equal to the number of the encoded spatial data streams to be transmitted; wherein the ratio of squared norms of the sums of the components of the different rows of the spatial spreading matrix is constrained to be the same as a first constant pre-determined sequence.