Spatial diversity technique combined with rotated constellation for MIMO-OFDM systems

MIMO-OFDM system significantly improves the data rates over wireless channels. V-BLAST is well known effective technique which enhances the system performance while allowing low implementation complexity. However, the performance of V-BLAST technique would be degraded by the error propagation due to the nulling and canceling process. In order to improve the performance of V-BLAST, this paper proposes spatial diversity technique combined with rotated constellation for MIMO-OFDM systems. It is demonstrated in the simulation evaluation that the proposed technique can offer excellent performance with spatial diversity gain in time-varying typical urban channel.