| Multi-input and multi-output Orthogonal Frequency Division Multiplexing (MIMI_OFDM) unified the merits of MIMO technology and OFDM technology Because of its merits which can enhance the channel capacity effectively, causes the using efficiency of frequency spectrum to promote doubly and greatly reduce the receiver order of complexity under the environment of multi-diameter. MIMO_OFDM is concerned by the filed of communication, being regarded as an important component in the fourth generation mobile communication technique.By analyzing the application of auto-adapted threshold frame synchronization algorithm in MIMO_OFDM system, combined the performance with the fixed threshold frame synchronization algorithm, And carry on the simulation experiment to the coarse synchronization effect,fine synchronization effect and correct examination rate of the auto-adapted threshold frame synchronization algorithm using the Matlab simulation platform, Simulation results show that,the auto-adapted threshold frame synchronization algorithm has the better performance in the aspect of realizing the synchronized capture rapidity and accurate. This article has mainly carried on the following works:Firstly,it analyse the performance that realize the frame synchronization auto-adapted threshold frame synchronization algorithm from the angle of theory and experiment in MIMO_OFDM system.This algorithm has overcome the questions of synchronous false alarm rate and police rate increases doubled and re-doubled which caused by the fixed threshold frame synchronization algorithm under the Rayleigh fading channel.Secondly,It analyses the algorithm flow and the characteristic of every kind of auto-adapted threshold synchronous detection algorithm in the wireless communication system.and then studies the synchronization capture situation of the auto-adapted threshold frame synchronization algorithm and the frame synchronization algorithm based on the orthogonal frame head the under the Rayleigh fading channel in MIMO_OFDM system,and obtains the dynamic changes.Thirdly,it establishes completely simulation platform which bases on Rayleigh the multi-diameter fading channel of MIMO_OFDM system, carries on the simulation opposite experiment to coarse synchronization effect, fine synchronization effect of two kinds of frame synchronization algorithm. At the same time, in the situation of no fixed signal-to-noise, carries on the simulation experiment toframe synchronization correct detection probability of two algorithms, The result show that auto-adapted threshold frame synchronization algorithm has the superiority of shorter capture time lower false alarm probability,and highly detection probability. It has the widespread application prospect. |
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