COSFA: an efficient spatial multiplexing scheme for rate adaptive systems

This paper introduces OFDM/MIMO architecture for rate adaptive systems denoted by COSFA. We assume multiple codeword transmission and use successive interference cancellation (SIC) at the receiver to decouple the different data sub-streams. The maximum data rate on each sub-stream as well as the number of data sub-streams, for particular channel realization, are predicted by the receiver and fed back to the transmitter. COSFA is designed to fit rate adaptive systems that can encounter wide range of SNR and channel conditions. It captures both the diversity and spatial multiplexing (SM) modes of the channel in one design. Moreover, COSFA is a power-efficient architecture since its inherent design allows full power utilization for any number of data sub-streams - a desirable feature in rate adaptive systems.