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针对多用户电力线通信系统的资源分配问题,为了保证用户间的公平性,引入速率比例约束条件,建立了功率最小化模型,然后分步进行子载波分配及功率分配,并提出了一种基于比特交换的最优功率分配算法。该算法先根据各用户的目标速率要求,在其占用子载波上进行等比特分配;再根据功率最小化准则,将剩余比特分配给增加1比特所需额外功率最小的子载波;最后在各用户分配总比特不变情况下,根据比特交换准则在子载波间进行比特交换,从而使功率分配达到最优。在经典电力线信道环境下仿真结果表明,本文算法在满足各用户间速率比例约束下能够有效降低系统能耗。
In order to ensure the fairness among users, aiming at the problem of resources allocation in multi-user power line communication system, a rate-proportional constraint is introduced and a power minimization model is established. Then sub-carrier allocation and power allocation are performed step by step. Exchange the optimal power allocation algorithm. The algorithm firstly allocates the same bit on its occupied subcarriers according to the target rate requirement of each user. According to the power minimization criterion, the remaining bits are allocated to the subcarriers with the minimum extra power required for adding 1 bit. Finally, Under the condition of allocating the total bits, the bit exchange between the subcarriers is carried out according to the bit exchange rule so that the power allocation is optimized. The simulation results in the classical power line channel environment show that the proposed algorithm can effectively reduce the system energy consumption while satisfying the rate proportional constraints among users.