摘要
当主用户和次用户在地理上存在一定距离时,由于次用户到达主用户系统的信号不同步,会产生异步干扰,此干扰不但影响主用户系统,使得其干扰增大,也会影响次用户系统,使得次用户系统传输速率损失,特别是误比特性能上升。为了消除异步干扰对主次用户系统的影响,提出了一种基于最小均方误差的预编码方法,此方法在预编码阶段就预先消除了异步干扰,并且是在保证主用户的服务质量基础上进行的。通过分析和仿真结果表明,所提方案在对主用户系统干扰受限的条件下,有效提升了次用户系统和次用户系统的容量,同时提高了次用户系统传输的可靠性。
When the primary users and second user geographically has certain distance, there are asynchronous interferen- ces. The interferences not only influence the primary user system, also can affect second user system. In order to elimi- nate the influence of asynchronous interference on primary and secondary users systems, this paper put forward a kind of precoding based on the minimum mean square error. Analysis and simulation results show that the proposed scheme in the main user system interference limited conditions, effectively enhances the user＇s system and second user system capacity, and improves the reliability of the transmission system of second users system,
出处
《计算机科学》
CSCD
北大核心
2013年第7期77-79,112,共4页
Computer Science
基金
河南省科技攻关项目(122102310393)资助
