Performance of Single-RF based MIMO-OFDM 2×2 using Turbo Code

摘要

In this paper, the performance of single-radio frequency (RF) technique in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) receiver using Turbo Code was evaluated. Data were encoded using Turbo encoder then modulated by 64-QAM and further transmitted using spatial multiplexing and modulated by OFDM. The simulation showed that the channel estimation technique worked well. It had shown by the curve between theory and estimated channel were coincided, which the block type of pilot structure was employed. While, the performance of Vertical-Bell Laboratories Layered Space-Time (V-BLAST) zero-forcing (ZF) detector was more reliable in Additive white Gaussian noise (AWGN) and multipath rayleigh fading channel. And the coding channel, Turbo Code with code rate 1/3, was more reliable and optimum if compared with code rate 1/2. So, it was capable to provide 0.24 dB coding gain (estimated channel) and 0.3 dB coding gain (perfect channel) in MIMO-OFDM system based on single-RF. As the comparison of antenna configuration, the number of transmitters on the MIMO-OFDM system used as much as 2 transmitters. For 2 receiver antennas based on single-RF worked better than 2 conventional receiver antennas in theory and estimation. However, it still has less performance of the system than 4 conventional receiver antennas. At BER of 10-3 and from the comparison of Turbo coding rate which used in system, the code rate 1/3 had provided 0.24 dB coding gain from the code rate 1/2 in estimation of single-RF system. Then, for 2 and 4 conventional receiver antennas configuration, the code rate 1/3 had provided 2.8 dB and 2.1 dB coding gain from the code rate 1/2 in estimation channel respectively.