Abstract:

To decrease feedback overhead, a phase rotation precoding for orthogonalized spatial multiplexing (PROSM) system is proposed, in which a proper rotation is set at the imaginary part of modulated signals. Compared with the power allocation precoding of OSM (PLOSM), the feedback information of this scheme is decreased and the complexity of calculating precoding parameter is also reduced. Simulation results show that with the same reliability of PLOSM, the proposed scheme saves four bits feedback overhead.

Key words: orthogonalized spatial multiplexing, precoding, phase rotation