分组空时块码系统中的Turbo接收技术研究  

A List Sphere Decoder Based Turbo Receiver for Groupwise STBC Systems

作　　者：张晓瀛[1] 王欣[1] 魏急波[1] 

机构地区：[1]国防科技大学电子科学与工程学院二系,湖南长沙410073

出　　处：《系统仿真学报》2008年第1期248-250,255,共4页Journal of System Simulation

摘　　要：在分组空时块码系统中引入了基于软球形译码的Turbo接收机。利用分组空时块码系统的正交性特点,设计了新的综合考虑信道状态、噪声影响和映射星座的软球形译码初始搜索半径确定方法。根据信道解码器反馈的先验信息扩充了传统软球形译码的搜索列表。通过仿真实验对接收机和两种传统迭代接收机进行了分析和比较,结果表明接收机在相同的迭代次数下较具有更好的性能,可以更快接近分组空时块码系统的性能限。A list sphere decoder （LSD） based turbo receiver was introduced for groupwise STBC systems. Using the orthogonality property of the groupwise STBC systems, a method was proposed to calculate the initial sphere radius for LSD, which took into account the channel state information, noise and constellation. Utilizing the prior information from the decoder, the conventional candidate list was augmented. Comparisons were made between the new receiver and the conventional iterative receivers through simulations. The results show that the new receiver has better performance than the conventional receivers at the same iteration and it can converge to the groupwise STBC system＇s performance bound faster.

关 键 词：分组空时块码系统 软球形译码 TURBO接收机 多输入多输出 

分 类 号：TN919[电子电信—通信与信息系统]