基于并行比特加载的DMT系统最优离散比特分配算法

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。

Parallel bit-loading-based optimal discrete bit allocation algorithm for DMT systems

An optimal discrete bit allocation algorithm was developed for resource allocation in future high-speed discrete multitone(DMT) systems.The algorithm first performs maximum bit rate allocation,then uses a parallel bit-loading algorithm to achieve the target bit rate.If the target bit rate allocation is not optimal,bit swapping is used to obtain the optimal solution.Simulations using a standard asymmetric digital subscriber line(ADSL) test loop show that the computational load of this algorithm is less than the optimal discrete bit allocation algorithm when the target rate is between 60% and 99% of the loop's maximum bit rate.Therefore the algorithm is especially useful for optimal discrete bit allocation in medium and high target bit rate DMT systems.