基于空间分集增益的分布式快速空频编码算法.docVIP

基于空间分集增益的分布式快速空频编码算法 　　摘 要： 针对多点协作（CoMP）无线通信系统的下行传输问题，提出一种分布式快速空频编码（DF?SFC）的方案。通过将小区边缘用户分组和分享相邻小区间的子载波获得空间分集增益，有效缓解了载波间干扰（ICI），基于此设计分布式解码器，将用户的解码复杂度降低到相同的非分布式空频编码最佳解码器的50%。通过将所提方案与Alamouti多点协作和非多点协作方案做比较，对用户与其基站之间相对距离对比研究了可实现的传输速率，并且推断出它的性能上限和下限，用于确立小区边缘用户的阈值，实现在提出的多点协作和非多点协作模式之间切换，以提高整体性能。仿真结果表明，在服务小区边缘用户方面提出的方案均优于Alamouti多点协作和非多点协作方案。 　　关键词： 协作多点传输； 载波间干扰； 空频编码； 子载波分配 　　中图分类号： TN919.3+1?34； TP391 文献标识码： A 文章编号： 1004?373X（2016）23?0029?05 　　Distributed fast space?frequency encoding algorithm based on space diversity gain 　　CHANG Benchao1， WANG Dan2， YANG Xinfeng3， 4 　　（1. Information Management Center， Huanghe Jiaotong University， Jiaozuo 454950， China； 　　2. Department of Information Engineering， Huanghe Jiaotong University， Jiaozuo 454950， China； 　　3. School of Computer Science and Technology， Wuhan University of Technology， Wuhan 430070， China； 　　4. College of Computer and Information Engineering， Nanyang Institute of Technology， Nanyang 473004， China） 　　Abstract： Aiming at the downlink transmission problem of the coordinated multi?point （CoMP） wireless communication system， a distributed fast space?frequency coding （DF?SFC） scheme is presented. The cell?edge users are grouped and the sub?carriers among neighbor cells are shared to obtain the space subset gain， so as to alleviate the inter?carrier interference （ICI）. In distributed decoder design based on above step， the user decoding complexity is reduced by 50% of the same non?distributed space?frequency coding optimal decoder. The proposed scheme is compared with Alamouti multipoint cooperation and non?multipoint cooperation schemes. The achievable transmission rate of the relative distance among the user and its base station is studied. The performance upper and lower limits are inferred to determine the threshold of the cell edge users， realize the switching between the proposed multipoint cooperation mode and non?multipoint cooperation mode， and improve the overall performance. The simulation r