基于格基约减的扩频通信多址干扰抑制算法

发布时间：2019-07-06 16:01

【摘要】：在链路资源受限条件下的扩频通信应用中,多址干扰是限制系统多用户服务能力和通信质量的主要因素。该文针对多址干扰消除问题,首次将格基约减理论应用到扩频通信多址干扰消除中,提出基于格基约减辅助的多用户检测算法,通过格基约减变换实现对信号间互相关矩阵的正交性优化,使多用户检测算法性能得到改进,以较低的运算复杂度实现了逼近最大似然算法的检测性能。该算法在对抗强远近效应方面表现出优异性能,不同于传统多用户检测算法在恶劣多址环境下检测性能的严重退化,该算法能够保持对最大似然检测算法性能的逼近,可以使扩频通信系统的传输可靠性、多用户服务能力以及环境适应性得到显著增强。
[Abstract]:In the application of spread spectrum communication under the condition of limited link resources, multiple access interference (mai) is the main factor that limits the multi-user service ability and communication quality of the system. In order to solve the problem of multiple access interference cancellation, the lattice reduction theory is applied to the multiple access interference cancellation of spread spectrum communication for the first time. A multi-user detection algorithm based on lattice reduction subtraction is proposed. The orthogonal optimization of the cross-correlation matrix between signals is realized by lattice basis reduction transform, so that the performance of the multi-user detection algorithm is improved, and the detection performance of the approximate maximum likelihood algorithm is realized with lower computational complexity. The algorithm shows excellent performance in fighting the strong far and near effect, which is different from the serious degradation of the detection performance of the traditional multi-user detection algorithm in the harsh multiple access environment. The algorithm can maintain the approximate performance of the maximum likelihood detection algorithm, and can significantly enhance the transmission reliability, multi-user service ability and environmental adaptability of the spread spectrum communication system.
【作者单位】：中国电子科技集团公司第五十四研究所;卫星导航系统与装备技术国家重点实验室;
【基金】：国家自然科学基金(91638203) 国家重点研发计划(2016YFB0502102)~~
【分类号】：TN914.42

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