Synchronization Technique For OFDM-based Wireless Transmission

This paper gives an overview on the development of wireless communication and the Orthogonal Frequency Division Multiplexing (OFDM) technique. Basic characters of wireless channel, transmission principles and signal frame structure design of OFDM are introduced. Main non synchronization factors between OFDM transceivers are pointed out. Based on the coherent reception theory of radio signals and the theory of digital signal processing, the effects of carrier frequency offset, sampling clock offset, and symbol timing offset on OFDM signals are exploited. A series of amendments and new algorithms is derived from the in being algorithms of Guard Interval based symbol timing and frequency offset estimation, frequency-domain frequency offset, sampling offset, and symbol timing offset estimation. With the aid of Matlab software simulation, this paper outlines a complete OFDM fast synchronization scheme suitable for wireless communication. Finally, Flexible Programming Gate Arrays (FPGA) based circuit frameworks for main components of OFDM synchronization are given.