Design of Multi-User Constructive Interference Precoding based on Outdated Channel State Information

This paper addresses the challenge of outdated channel state information (CSI) in multi-user wireless communication systems, particularly focusing on effective management of inter-user interference (IUI), by proposing an innovative strategy that combines constructive interference (CI) techniques with mechanisms for handling outdated CSI. With a focus on MPSK modulation scenarios, exemplified by 8-PSK, this study explores how precoding designs can enhance system performance and robustness in multi-user environments. The research outcomes reveal a strong correlation between bit error rate (BER) and channel correlation, emphasizing the significance of leveraging channel correlation for optimizing precoding strategies under non-ideal channel conditions. This work thereby charts a new path for designing efficient and stable wireless communication systems.