Distributed Symmetric Turbo Coded OFDM Scheme Incorporated with STBC-MIMO Antennas for Coded-Cooperative Wireless Communication under Wideband Noise Jamming Environment

Abstract

This research paper proposes a novel anti-jamming technique based on a single-relay distributed symmetric Turbo coded orthogonal frequency division multiplexing (DSTC-OFDM) scheme. The stated scheme is incorporated with Alamouti space-time block code (STBC) multiple-input multiple-output (MIMO) 2×2 antennas for coded-cooperative wireless communication system under wideband noise jamming environment. As a suitable benchmark for comparison, a conventional symmetric Turbo coded OFDM (STC-OFDM) scheme incorporated with Alamouti STBC-MIMO (2×2) antennas is also developed for non-cooperative wireless communication system under the same jamming environment. Moreover, both the proposed MIMO schemes are compared with the corresponding single-antenna schemes. In this research, the modulation techniques employed are binary phase-shift keying and M-ary quadrature amplitude modulation while soft-demodulators are used at the destination node along with a joint iterative soft-input/soft-output decoding tech-nique. According to the Monte Carlo simulation results, the proposed DSTC-OFDM-MIMO (coded-cooperative) scheme with Alamouti-STBC (2×2) antennas outperforms the STC-OFDM-MIMO (non-cooperative) scheme by a gain that ranges between 0.5–6 dB for different jamming scenarios in the high SNR simulated region under the same conditions, i.e., the code rates Rc = 1/3 and data frame lengths l = 512 bits for both the proposed schemes. However, in the low SNR simulated region, the STC-OFDM-MIMO scheme shows similar performance as the DSTC-OFDM-MIMO scheme, under identical conditions. Furthermore, the proposed distributed scheme with STBC-MIMO (2×2) antennas incorporates both coding gain and cooperative diversity gain.