A Novel Maximum Distance Separable Coded OFDM-RIS for 6G Wireless Communications

The vision of the sixth generation mobile communication (6G) calls for extremely reliable data transmission over complex and diverse wireless channels. By combining the maximum distance separable (MDS) codes with the classic orthogonal frequency division multiplexing (OFDM), we present a new paradigm with the assistance of the reconfigurable intelligent surfaces (RIS). In our design, the RIS with limited phase shifts are adopted and the pairwise error probability (PEP) of the proposed system is first derived. Then, in order to further minimize the bit error rate (BER), we provide a novel method based on phase alignment to obtain the optimal solution for the discrete phase shifts. Our simulation results show that the proposed scheme provides considerable BER performance improvements compared to conventional OFDM systems. Moreover, the proposed discrete phase optimization algorithm is capable of achieving performance similar to that of the system with continuous phase shifts.

Automated summary

The vision of 6G is to achieve reliable data transmission in complex and diverse wireless channels. A new paradigm is proposed by combining MDS codes with OFDM and utilizing RIS. The proposed system utilizes RIS with limited phase shifts and a novel method based on phase alignment to minimize BER. Simulation results demonstrate significant BER improvements compared to conventional OFDM systems and similar performance to systems with continuous phase shifts is achieved by the proposed optimization algorithm.