Performance comparison of SISO and MIMO-OFDM based on SDR platform

Due to requirement of reliable high-speed wireless communication, OFDM combined with multiple antennas (MIMO) system is a key technology for next-generation wireless communications to improve transmission performance. In this paper, we conduct field experiment for SISO and MIMO-OFDM using USRP N210 hardware as SDR platform. The research is conducted in LOS and NLOS environment with 16-QAM modulation technique. The result shows that MIMO-OFDM achieves better performance than SISO-OFDM. 2×2 MIMO spatial diversity with Alamouti STBC algorithm gives 2 dB diversity gain at BER of 5.10
^-4
in LOS scheme and 6.7 dB in NLOS scheme at BER of 5.10
^-3
.