无线多址接入网络编码中继的信道分配算法

无线多址接入中继网络中,用户可选择是否接入中继,同时中继也可选择所服务的用户。在中继处应用网络编码技术可使单个中继同时服务于2个用户共享同一时频资源进行无干扰信息传输。基站采用联合检测方法恢复原始信息,从而得到传输速率的提升。针对多用户多中继场景,为了进一步提升系统的吞吐量,需要为用户选择合适的中继协助其传输,考虑到多址网络编码中继的中继选择问题是一个复杂的优化问题,为了降低其求解复杂度,分别采用基于贪婪准则和考虑用户公平性的信道分配算法进行求解。仿真结果表明,所提信道分配算法相比于随机信道分配可获得较大的性能增益,并且基于贪婪准则的算法性能优于考虑用户公平性的算法。

Channel Allocation Algorithmin Wireless Multiple Access Relay with Network Coding

In the wireless multiple access relay network, the user can choose whether to access to the relay, meanwhile, the relay can choose the user it serves.The network coding in the relay enables a single relay to serve two users at the same time who can share the same time and frequency resources and transmit without interference.The base station applies combined detection to recover original message,in order to raise the transmission rate.Considering multi-user and multi-relay,to further improve the throughput of system ,we need to choose proper relay to assist the users＇ transmission. Also considering that the relay choosing is a complicated optimization problem in multi-access network coding,we use the channel allocation algorithms based on greedy principle and considering the users＇ fairness respectively.The simulation result shows,the said channel allocation algorithms have larger gains in performance compared with random channel allocation algorithm, and the algorithm based on greedy principle has better performance than that of algorithm considering the users＇ fairness.