感知蜂窝网中具有多主用户的干扰对齐算法

Interference alignment algorithm with multiple primary users in cognitive cellular networks

针对具有多个主用户和多个次用户的TD(time division)感知蜂窝网络,给出一种多个主用户和多个次用户的干扰对齐算法。考虑1个宏蜂窝网络与2个小蜂窝网络共存,且同时利用同样频率进行通信的情况,宏蜂窝中有2个主用户,每个小蜂窝中有2个次用户。按照实际应用场景中干扰的多少将次用户分为2类,让主用户也参与次用户的干扰对齐,根据最大信干噪比方案设计干扰对齐算法,利用迭代方法求解。通过系统仿真显示,在主用户容量牺牲很小的情况下次用户的容量得到改善,同时系统的总容量得到提高。

In this paper, an interference alignment （IA） algorithm is proposed for TD （ time division） cognitive cellular networks with multiple primary users and secondary users. Considering the situations that a macroeell and two small cells coexist over the same spectrum and communicating using the same frequency at the same time, there are two primary users in the macrocell, and two secondary users in each small cell. The secondary users are divided into two types according to the application scene, and the primary receiver also participates in the IA algorithm by performing interference suppression. The IA algorithm is projected with Max-SINR（ signal to interference and noise ratio） algorithm and solved by the iterative method. According to the simulation results, in the case of small capacity sacrifice of the primary users, the capacity of secondary users is improved, and the total capacity of the system is also improved.