Abstract:

In this paper, a novel space-frequency transform scheme with good performance to suppress the co-antenna interference (CAI) in wireless communication is presented. The scheme is implemented in a MIMO OFDM Turbo transceiver. At the transmitter, we use a pre-designed symbol-mapping pattern for each transmitting antenna. At the receiver, according to the pre-designed transmitter structure, a two-stage detector receiver, including MMSE detection and interference subtracted step in stage one and BCJR (Bahl Cocke Jelinek Raviv) or SOMA (soft output M-algorithm) (M-algorithm) in stage two, performs two successive decisions through an iterative process. In each iteration process, soft information is exchanged between the detector and the decoder, and interference among multiple streams is subtracted. Simulation results show that the proposed scheme with BCJR achieves better performance over D-STTD CC coding. It also outperforms D-STTD Turbo coding after two and three iterations in 4×4 MIMO systems.

Key words:

MIMO, OFDM, Turbo transceiver, two-stage detector