Improved timing carrier synchronizer and error controller for wireless multimedia sensor networks

The improved synchronization algorithm and error controller structure for OFDM system in wireless multimedia sensor networks are presented. The timing and carrier synchronization are acquired by coarse estimate and fine synchronization. The simulation results show that the improved synchronization algorithm performance of timing and carrier synchronization is better than traditional algorithm, merely poorer than Park algorithm. The OFDM synchronizer and error controller are verified on the platform of Altera FPGA. The results validate that each performance of both improved synchronization and error controlling method meets WMSN system requirements better. Timing error is only one sampling point and the frequency offset is 0.25% of sub-carrier frequency interval.