摘要
针对正交频分复用(OFDM)系统提出了一种基于D-S证据理论的媒体接入控制(MAC)层调度策略,该策略采用QoS要求中时延、速率公平性和丢包率三个评价指标来确定数据包调度优先级。通过为各评价指标分别选取隶属度函数,进而求得基本概率分配值,并利用D-S证据理论的合成法则将三个评价指标进行融合判决,判决后结果作为层间信息传递给物理(PHY)层,PHY层根据MAC层提供的控制参数,完成子载波、功率和比特的分配,实现跨层资源分配。建立电力线通信(PLC)系统模型,仿真并与现有跨层资源分配算法比较,结果表明所提算法能够根据信道条件在满足多业务用户Qos需求的情况下动态分配资源,在保证系统性能的基础上满足不同业务用户的QoS要求。
A media access control （MAC） layer dispatch strategy based on D-S evidence theory is proposed towards OFDM system. The strategy adopts three evaluation indexes to judge packet scheduling priority which including time delay, rate fairness and packet loss ratio. Through selecting membership function for every evaluation indicator, the value of basic probability assignment is gained, and the three evaluation indicators for judging are merged using the combination rule of D-S evidence theory. Then the results of judgment are delivered to physical layer as layer information. According to the controlling parameter offered by MAC layer, physical layer accomplishes the allocation of sub-carrier wave, power and bit, as well as cross-layer resource allocation. By means of establishing power line communication （PLC） system model, simulation is conducted. Comparing with contemporary cross-layer resource allocation algorithm, the results indicate that the proposed algorithm can allot resources dynamically, and meet the demands of multi-service users as well as ensure system performance. This work is supported by National Science and Technology Major Project （No. 2010ZX03006-005-01）.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第14期31-37,共7页
Power System Protection and Control
基金
国家科技重大专项(2010ZX03006-005-01)~~
