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为满足未来高速离散多音频调制(DMT)系统资源分配的需要,提出一种新的最优离散比特分配算法。初始阶段进行最大比特率加载,然后利用并行比特加载实现目标比特率分配,最后通过比特互换使非最优目标比特率分配最优化。针对标准非对称数字用户线测试环路的仿真实验表明,在目标比特率为环路最大比特率的60%~99%范围内,该算法的运算量明显低于现有最优算法,适用于中高目标比特率DMT系统的最优离散比特分配。
In order to meet the need of resource allocation of high speed discrete multi-tone modulation (DMT) system in the future, a new optimal discrete bit allocation algorithm is proposed. In the initial stage, the maximum bit rate is loaded, and then the target bit rate allocation is achieved by using parallel bit loading. Finally, the non-optimal target bit rate allocation is optimized through bit swap. Simulation experiments on a standard asymmetric digital subscriber line test loop show that the computational complexity of this algorithm is significantly lower than that of the existing optimal algorithm at a target bit rate of 60% ~ 99% of the maximum bit rate of the loop, Optimal Discrete Bit Allocation in DMT System with High Target Bit Rate.