| Orthogonal Frequency Division Multiplexing (OFDM), a special form of multicarrier modulation (MCM), has recently received considerable attention as well as be considered as the core technique of the forth mobile communication. It's be widely used in high speed digital communication for its robustness to multipath selective fading and high bandwidth efficiency.As a kind of multicarrier modulation using orthogonal sub carriers, OFDM is sensitive to frequency offset and the time synchronization error. The key problem is acquiring the synchronization information. There are two kinds of synchronization algorithm, basing on date and un-basing on data. This paper focus on the front one. The tasks of this paper are four points.(1) Build a model for basic OFDM system in MATLAB/SIMULINK.(2) Analyze ML algorithm and SC algorithm and then realize them with programming in MATLAB. Finally, find the shortcuts of them.(3) A new improved algorithm based on SC algorithm is introduced and analyzed. As the result, the programmed algorithm will improve the time synchronization of SC algorithm.(4) These three algorithms are compared in two aspects, the figure of time synchronization and Standard Deviation of frequency offset. |
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