Full-rate and Low Complexity Space-time Coding Scheme Concatenated with LDPC Codes

In this paper, a full-rate and low complexity space-time coding scheme with complex orthogonal design is developed, and LDPC code is employed as channel coding to improve the proposed scheme performance further. Compared with full-diversity space-time code schemes, the developed scheme can implement full data rate, low calculation complexity and partial diversity; and it can adopt lower order modulation scheme under the same system throughput. Moreover, using the developed scheme can form efficient spatial interleaving, thus the performance loss due to partial diversity is effectively compensated by the concatenation of channel coding. Simulation results show that on the condition of the same system throughput and concatenation of channel coding, the developed scheme has lower bit error rate than those low-rate and full-diversity multiple antennas space-time coding schemes.