基于LTE系统的一种低复杂度的球型译码算法  

A Low-Complexity Algorithm of Sphere Decoding in LTE System

作　　者：袁冬冬[1,2] 仇润鹤[1,2] 

机构地区：[1]东华大学信息科学与技术学院,上海201620 [2]东华大学数字化纺织服装技术教育部工程研究中心,上海201620

出　　处：《通信技术》2015年第2期151-155,共5页Communications Technology

摘　　要：针对球型译码检测算法在信道条件较差时检测复杂度大的问题,在分析比较传统的检测算法的基础上,提出了一种降低球型译码复杂度的算法。该算法采用固定阈值作为可靠性判断标准,将迫零检测算法与球型译码算法相结合,首先利用迫零检测算法对传输数据进行检测,然后对迫零算法检测出来的数据进行可靠性判断,若检测出来的数据可靠性高则采用迫零算法作为最终结果,若可靠性较低则对数据进行球型译码,同时利用迫零检测结果来选择球型译码算法的初始半径。通过仿真得出,在4x4天线下该算法在保证误码率基本不变的情况下大大降低了球型译码的复杂度。Aiming at the high complexity of SD（ Sphere Decoding） detection algorithm under poor channel conditions and based on the analysis and comparison of traditional detection algorithms,this paper proposes a method for reducing the complexity of SD algorithm.This algorithm adopts a fixed threshold as the reliability criterion and combines ZF（ Zero Forcing） algorithm with SD algorithm.Firstly ZF algorithm is used to detect the transmitted data,and then determine the reliability of ZF data.And if the data enjoys high reliability ZF algorithm would be adopted as the final result; if the data is less reliable,SD algorithm be used.Meanwhile,ZF detection result is used to select the initial radius of SF algorithm.Simulation shows that this algorithm could greatly reduce the complexity of SD algorithm while maintaining the error rate almost unchanged in 4 × 4 antenna.

关 键 词：LTE系统 迫零检测 球型译码检测 可靠性判断 

分 类 号：TN929.5[电子电信—通信与信息系统]