Abstract:

A Transmit Preprocessing Technique for Downlink Spatial Multiplexing in Multi-user MIMO Channels was proposed. Through adding additional constraint to the joint TxRx MMSE optimization scheme the equivalent channel could be changed from block diagonalization to complete diagonalization. MUI (multi-user interference) and per user multi stream interference could be canceled simultaneously. The modified algorithm is much more feasible and has the advantage of simplifying the receivers. A general complete diagonalization is the channel inversion algorithm. Performance analysis and comparison prove the complete diagonalization algorithm proposed has better performance than channel inversion algorithm.

Key words: spatial division multiple access, multi-user interference, block diagonalization, complete diagonalization