Multiple-Metric Frame Optimization for OTFS with Experimental Demonstration

Orthogonal Time Frequency Space (OTFS) modulation emerges as a promising waveform for next generation wireless communications. The efficacy of OTFS, in both communication and sensing realms, is critically dependent on the design of its frame structure. This study delves into the design and optimization of a pilot-symbol-aided OTFS frame, with an emphasis on enhancing spectrum efficiency, minimizing the Peak-to-Average Power Ratio (PAPR), and reducing bit error rate (BER). Specifically, we first analyze the impact of specific channel characteristics on BER. Subsequently, we engage in a detailed exploration of the interplay between frame parameters and performance metrics, namely the spectrum efficiency, PAPR, and BER. We eventually propose an optimization framework for embedded-pilot OTFS frames, aimed at attaining optimal performance across these metrics. Through both simulations and experiments, we demonstrate that the optimized OTFS frame architecture offers significant improvements in BER and our optimization framework provides profound insights into determining the optimal frame parameters tailored to specific use cases, with an emphasis on varying priorities.