Study On OFDM Synchronization Based On Burst Packet Transmission

Following OFDM principle and transceiver model, representative OFDM synchronization methods are analyzed based on either cyclic prefixes or training symbols. Focus is on the performance of several synchronization methods in burst packet transmission with reference to 802.11a frame structure and parameters. An improved burst-frame preamble is presented, as well as the corresponding timing and frequency offset estimator. Simulation results indicate the improved method avoids the correlation plateau, keeps low complexity and has a good estimation performance in time and frequency field.According to the improved method above, a real OFDM synchronization module is designed and realized based on burst packet transmission. This dissertation puts forward a general type of OFDM synchronization structure based on FPGA. Synchronization module introduces computing pipeline and reverse-Cordic algorithm in order to achieve frame capture, symbol timing and frequency offset estimation. An IF syetem for transmitting and receiving is accomplished after debug. Test results in AWGN channel are shown at the end of this dissertation, and the comparision between test results and theoretical conclusion as well. Analysis shows that good synchronization performance contributes to the success of IF receiving system.