摘要
Ｔｕｒｂｏ码的译码过程引入一种全新的迭代译码思想。这种思想不仅仅适用于Ｔｕｒｂｏ码的译码，也适用于更为广泛的检测译码问题，如串行级联码译码、均衡、编码调制、多用户检测等。文中简述了Ｔｕｒｂｏ译码原理及逐符号最大后验算法（ｓｙｍｂｏｌ－ｂｙ－ｓｙｍｂｏｌＭＡＰ），将Ｔｕｒｂｏ译码原理应用于ＣＤＭＡ系统的多用户检测，提出了基于Ｔｕｒｂｏ译码原理的多用户检测接收机方案，并通过计算机仿真验证该方案的性能。结果表明，文中所提出的方案经过４次迭代之后，其误码率接近单用户界，这种接收机可去除多址干扰（ＭＡＩ）的影响。
Turbo decoder introduce a iterative decoder,which can be successfully applied to more general detection and decoding problems such as serial concatenation,equalization and multiuser detection.In the paper,we introduce the basic Turbo principle and symbol by symbol MAP algorithm.And we apply it to multiuser detection in a convolutionally coded asynchronous multipath CDMA system.We propose a multiuser detection scheme based on Turbo decoder principle and simulate its performance by computer simulation.Finally simulation results show that the proposed multiuser receiver has performance very close to single user bound.
出处
《桂林电子工业学院学报》
1998年第4期20-24,共5页
Journal of Guilin Institute of Electronic Technology
关键词
TURBO码
码分多址
多用户检测
信道编码
Turbo code,CDMA,multiuser detection,iterative decoder,soft in soft out
