Generalized Block-Diagonalization Schemes for MIMO Relay Broadcasting Systems

Abstract EN

We propose two generalized block-diagonalization (BD) schemes for multiple-input multiple-output (MIMO) relay broadcasting systems with no channel state information (CSI) at base station.

We first introduce a generalized zero forcing (ZF) scheme that reduces the complexity of the traditional BD scheme.

Then the optimal power loading matrix for the proposed scheme is analyzed and the closed-form solution is derived.

Furthermore, an enhanced scheme is proposed by employing the minimum-mean-squared-error (MMSE) criterion.

Simulation results show that the proposed generalized MMSE scheme outperforms the other schemes and the optimal power loading scheme improves the sum-rate performance efficiently.