A Study on a Code Assisted Based Blind Timing Synchronization Technique for Short Data Packets

Short packets based on Cyclic Code Shift Keying (CCSK) can eliminate the pilot synchronization sequence overhead and effectively improve the transmission efficiency of short packets, however, its timing synchronization accuracy performs poorly at low SNR, this paper proposes a CCSK short packet based on Non-Binary Low Density Parity Check Code (NB-LDPC) blind timing synchronization scheme. The scheme utilizes the check matrix of NB-LDPC to construct the objective function, and the total number of accumulated objective functions satisfying the check matrix is used as the synchronization metric criterion to achieve the estimation of the CCSK short packet code-slice level timing error. Simulation results show that for the short packet blind synchronization system, the NB-LDPC-based code-assisted synchronization is more effective and significantly improves the system performance at low signal-to-noise ratios.