关键词: 电力线通信, 用户调度, 跨层参数, 资源分配, 地窖注水

Abstract: An optimal multi-layer multi-objective cross-layer resource allocation algorithm with user scheduling in data link control layer and resource allocation in physical layer was proposed for multi-user multi-service OFDMA (Orthogonal Frequency Division Multiple Access) power-line communications systems. Firstly in the user scheduling, the scheduled users and their optimal cross-layer parameters were ascertained based on each user's current QoS, the desired QoS, traffic packet model, channel information and queue status. Secondly, in the resources allocation, according to all the scheduled users' desired QoS, optimal cross-layer parameters and channel state information, power was assigned to every subcarrier by cellar water-filling theory, then each subcarrier to the scheduled users was optimally assigned and the allocated power and bits of each subcarrier were adjusted by bit-loading looking-up table algorithm. Finally in a typical power-line channel environment, the simulation results illustrate that the proposed algorithm can ensure users' QoS and effectively improve the resource utilization.

Key words: Power-line communications, user scheduling, cross-layer parameter, resource allocation, cellar water-filling