传统蜂窝网络采用固定的频谱资源分配方式,导致频谱利用率低且无法满足用户高速和高质量通信需求.针对这种局限性提出了一种将分布式天线系统(Distributed Antenna System,DAS)与终端直通(Device to Device,D2D)通信技术相结合的策略.首先,该方案提出协同上下行链路(Uplink and Down-link Collaboration,UADC)的资源分配算法,并构建了以最大化系统总效率为目标的非线性规划问题.然后,将该问题分为最佳功率选择和信道分配2个子问题,同时利用匈牙利算法为D2D对选择最佳信道.最后,在MATLAB仿真平台进行实验.仿真结果表明,相比于仅复用上行链路的和仅使用DAS系统的方法,所提方案的频谱效率更高.
Spectrum Resource Allocation Scheme for Uplink and Downlink Collaboration
Traditional cellular networks use fixed spectrum resource allocation method,which leads to low spec-trum utilization and inability to meet the needs of high-speed and high-quality communication for users.Aiming at this limitation,a strategy that combines distributed antenna system(DAS)with device to device(D2D)com-munication technology is proposed.Firstly,a resource allocation algorithm for uplink and downlink collaboration(UADC)is proposed,and a nonlinear programming problem is constructed to maximize the total system effi-ciency.Secondly,the problem is divided into two sub-problems,the best power selection and the channel as-signment,and the Hungarian algorithm is used to select the best channel for the D2D pair.Finally,experiments are carried out on the MATLAB simulation platform.The simulation results show that the spectral efficiency of the proposed scheme is higher than that of only multiplexing the uplink and only using the DAS.
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