Orthogonal Time Frequency Space Based 5G Broadcast - Secondary Synchronization Signal

Recent advancements in Long Term Evolution (LTE)-based 5G Terrestrial Broadcast have enhanced physical layer performance, particularly for large-area coverage. Built on the LTE standard, it utilizes Orthogonal Frequency Division Multiplexing (OFDM), well-suited for multipath environments. Traditional LTE unicast restricts the cell radius to approximately 5 km, but modified OFDM numerologies are required for High Power High Tower (HPHT) configurations to extend coverage. However, stability issues persist in high-speed vehicular reception. Orthogonal Time Frequency Space (OTFS) modulation, resistant to Doppler shifts, offers a promising alternative. This paper investigates synchronization strategies for extending LTE-based 5G Terrestrial Broadcast using OTFS modulation, focusing on Secondary Synchronization Signal (SSS) detection. A method to map the SSS into an OTFS frame is proposed, facilitating correlation-based synchronization. Simulation results demonstrate the robustness of the approach, and future research directions are outlined.