A downlink group pre-coding scheme for MBMS in distributed MIMO system

In this paper, a group pre-coding scheme is proposed for multimedia broadcast multicast service (MBMS) downlink transmission in distributed multiple input multiple output (D-MIMO) antenna system. The ideal channel state information (CSI) is assumed to know at both transmitters and receivers. In order to evaluate the performance of the group pre-coding, the average symbol error rate (SER) of the Block Diagonalization - Minimum Mean Square Error (BD-MMSE) and Block Diagonalization - Zero forcing (BD-ZF) algorithms with group pre-coding in both D-MIMO and centralized MIMO (C-MIMO) system are investigated through Monte Carlo simulation. The SER performance of conventional pre-coding schemes with BD-MMSE is also given for comparison. The simulation results show that the degradation in SER performance of group pre-coding proposed is slightly comparing with that of the conventional pre-coding scheme, but the computational complexity of group pre-coding scheme is reduced significantly.