A novel timing synchronization scheme for IEEE802.16 OFDM systems
Cheng Xiao-ming · Journal of Northwest University · 2008
Aim To propose a novel timing synchronization scheme compatible to IEEE802.16 specification.The method includes two stages.One is frame detection using short preamble and second is fine timing synchronization using long preamble.Methods At frame detection stage,receiving data buffers are divided into several groups.It means a new frame coming only when auto-correlation peaks of each group meet special limitations.Then,cross-correlation is computed between cycle-shifting long preamble and data to find exact beginning of signals.Results Simulation results demonstrate that the proposed timing scheme has good performance at low SNR with large frequency offset.Conclusion This method is more accurate than traditional auto-correlation at low SNR(signal-to-noise ratios),and more robust than cross-correlation with original long preamble.