Communication Over MIMO Broadcast Channels Using Lattice-Basis Reduction

by Mahmoud Taherzadeh, Amin Mobasher, & Amir K. Khandani arXiv.org E-print Archive, 22 Jan 2006 A simple scheme for communication over multiple-input multiple-output (MIMO) broadcast channels is introduced which adopts the lattice reduction technique to improve the naive channel inversion method. Lattice basis reduction helps us to reduce the average transmitted energy by modifying the region which includes the constellation points. Simulation results show that the proposed scheme performs well, and as compared to the more complex methods has a negligible loss. Moreover, the proposed method is extended to the case of different rates for different users. The asymptotic behavior of the symbol error rate of the proposed method and the outage probability for the case of fixed-rate users are analyzed. It is shown that the proposed method achieves the optimum asymptotic slope of symbol-error-rate. Also, the outage probability for the case of fixed sum-rate is analyzed. Read more