And a improved Greedy algorithm is proposed and use in this system. At last , a new adaptive modulation algorithm which is base on the adaptive unsaturated technique is proposed , both the improved Greedy algorithm and the new algorithm can improve the transmission performance of the system and effectively. Especially, the new algorithm base on the best clothes blog adaptive non-saturated has a significant theoretical and practical value. The main works lie:First, a new multimode fiber model which is fit for simulation is proposed .In this chi pink dazzle section ,several old multimode fiber models are describe, through function fitting,a simple model which can describe the performance of the multimode fiber channel exactly is found . Through chi hair straightener simulating by the QQ map in MATLAB, we get the result that the new model is conforming for the old multimode fiber models very well.Second, the current significant adaptive bit assignment ralph lauren polo shirts algorithm theories cheap polo shirts are analyzed, base on these theories, the implement of the algorithm is learnt deeply, and a current best adaptive bit assignment algorithm is used in multimode fiber channel. The simulation result shows that the algorithm can improve the BER effectively. Especially, this algorithm provides a good comparison model with other improved algorithm and new algorithm.Third, a proved adaptive bit assignment algorithm base4 on threshold is proposed. The theory and the flow about the algorithm are described in detail. And the algorithm is used in the OFDM communication system. The algorithm is simulated on different bit rate, different transmission performance.
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