Abstract
Reconfigure intelligent surface (RIS) is considered as a promising technology for next generation wireless networks to improve spectrum efficiency or energy efficiency. This letter, for the first time, investigates a practical RIS-aided coded system. Specially, we consider a forward-error-correction (FEC) code and a linear precoder at the transmitter, while a low-complexity iterative receiver is adopted. In addition, the inter-symbol interference (ISI) channels are considered. We aim to jointly optimize the precoding and the passive beamforming of the RIS to minimize the transmission power given the bit error rate (BER). To solve this non-convex optimization problem, we utilize the alternate optimization to iteratively optimize the precoding and passive beamforming, which are respectively a convex problem and a fractional programming problem. Numerical results show that significant performance improvement can be achieved with the proposed optimization scheme.
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