Abstract:

A system that integrates space-time block code（STBC） into the dual-layer precoding is proposed. A dual-layer precoding multiple input multiple output (MIMO) system model based on STBC is established and its beamfoming vector is calculated. On two virtual sub-channels formed by precoding, two data streams are transmitted simultaneously. Then, combined with Alamouti STBC, the hybrid system can also get the diversity gain. A reduced complexity decoding algorithm is designed for the STBC dual-layer precoding system. Theoretical analysis and simulation results show that the new system can achieve diversity gain and multiplexing gain simultaneously, and also improve the channel capacity effectively. The performance of the proposed scheme greatly gains over the usual MIMO system.