Patent ID: 7324792

Claim:
A signal transmitting method in a mobile communication system which uses multiple transmitting antennas, comprising: determining a correlation among the transmitting antennas; determining a detection efficiency of each of a plurality of symbols, the detection efficiency for each symbol determined based on a position of the symbol relative to an origin point in a constellation pattern, said constellation pattern including multiple symbols located along one or more radial axes projecting from the origin point; allocating the symbols to transmitting antennas according to the correlation among the transmitting antennas and according to the detection efficiency of each of the symbols, said allocating including: allocating symbols with a first level of detection efficiency to respective ones of a first set of the transmitting antennas, and allocating symbols with at least a second level of detection efficiency to respective ones of a second set of the transmitting antennas, wherein the first and second sets of transmitting antennas have different degrees of correlation and wherein the symbols are allocated to achieve a desired symbol detection efficiency at a receiver; and transmitting the allocated symbols via the transmitting antennas.