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A resource allocation problem considering both efficiency and fairness in orthogonal frequency division multiple access (OFDMA) systems is studied. According to the optimality conditions, a downlink resource allocation algorithm consisting of subcarrier assignment and power allocation is proposed. By adjusting the tradeoff coefficient, the proposed algorithm can achieve different levels of compromise between efficiency and fairness. The well-known classic resource allocation policies such as sum-rate maximization algorithm, proportional fairness algorithm and max-min algorithm are all special cases of the proposed algorithm. Simulation results show that the compromise between efficiency and fairness can be continuously adjusted according to system requirements. 相似文献
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针对传统智能超表面无法透射信号的问题,利用同步透射反射智能超表面,提出了一种基于非正交多址接入的信号增强算法。同步透射反射智能超表面具有全向性的特点,可同时服务两侧的非正交多址接入用户。所提算法将同步透射反射智能超表面的信号与通信信号相干叠加,利用黎曼共轭梯度算法求解优化问题,理论上可大幅增强用户的信号功率,降低中断概率,提高频谱效率性能。由仿真结果可知,与不使用同步透射反射智能超表面相比,随机相位的同步透射反射智能超表面可以提高约3.6 bit/(s·Hz)的系统频谱效率。利用黎曼共轭梯度算法优化后,可进一步提高约2.3 bit/(s·Hz)的系统频谱效率,该结果验证了所提算法的优越性。 相似文献
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TETRA数字集群系统上MAC层协议栈的开发 总被引:1,自引:0,他引:1
文章首先描述TTETRA空中接口协议栈的结构和主要功能,然后详细阐述了上MAC协议栈的功能、工作原理及其开发过程,最后对所开发的协议栈进行了仿真和测试。仿真测试结果与《ETSITS100392—2TETRAV+DPart2:AirInterface》协议一致。 相似文献
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