TRANSMITTER DIVERSITY TECHNIQUE FOR WIRELESS COMMUNICATIONS

摘要

A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only simple arithmetic operations, such as negation an d conjugation. The diversity created by the transmitter utilizes space diversity and either time or frequency diversity. Space diversity is effected by redundantly transmitting over a plurality of antennas, time diversity is effected by redundantly transmitting at different times, a nd frequency diversity is effected by redundantly transmitting at different frequencies. Illustratively, using two transmit antennas and a single receive antenna, one of the disclosed embodiments provides the same diversity gain as the maximal-ratio receiver combining (MRRC) schem e with one transmit antenna and two receive antennas. The principles of this invention are applicable to arrangements with more than t wo antennas, and an illustrative embodiment is disclosed using the same space block code with two transmit and two receive antennas.