Optimized MRC Detection with Low Complexity for IRS-Aided Single User MIMO OTFS Systems

This paper introduces an innovative detection strategy for IRS-aided single-user MIMO systems utilizing OTFS modulation, specifically designed to operate efficiently under hardware constraints such as Carrier Frequency Offset (CFO). The proposed approach leverages Maximum Ratio Combining (MRC) to enhance signal quality by effectively mitigating multi-path fading and inter-antenna interference, which are critical challenges in high-mobility environments. A standout feature of this detection strategy is its low computational complexity, making it highly suitable for real-time implementation in dynamic and resource-constrained wireless systems. Through extensive simulations, the performance of IRS-aided MIMO-OTFS systems with MRC detection is shown to consistently outperform traditional detection methods, demonstrating notable improvements in reliability and signal quality. These results underscore the transformative potential of combining IRS and OTFS modulation techniques to propel the development of next-generation wireless communication systems, offering enhanced performance, efficiency, and robustness.