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In this paper, we have investigated the application of non-binary LDPC codesto spatial multiplexing MIMO systems with a large number of low power antennas.We demonstrate that such large MIMO systems incorporating with low-complexityMMSE detector and non-binary LDPC codes can achieve low probability of biterror at near MIMO capacity. The new proposed non-binary LDPC coded system alsoperforms better than other coded large MIMO systems known in the presentliterature. For instance, non-binary LDPC coded BPSK-MIMO system with 600transmit/receive antennas performs within 3.4 dB from the capacity while thebest known turbo coded system operates about 9.4 dB away from the capacity.Based on the simulation results provided in this paper, the proposed non-binaryLDPC coded large MIMO system is capable of supporting ultra high spectralefficiency at low bit error rate.

Near Capacity Approaching for Large MIMO Systems by Non-Binary LDPC Codes with MMSE Detection