RANGING SIGNAL DESIGN AND ITS DETECTION FOR OFDMA SYSTEMS

A single-symbol based initial ranging signal structure and the associated signal detection and timing synchronization methods for OFDMA systems are presented. The proposed structure makes it feasible and flexible for a receiver to de-tect single and multiple ranging codes and estimate the cor-responding timing offsets. Our approach offers improved performance and enhanced robustness against multi-user in-terference and multi-path fading. Numerical results verify the effectiveness of the proposed method and its advantages over existing alternatives. Index Terms — OFDMA, ranging process, multi-user ranging code detection, timing estimation, and MUSI