多径衰落信道下改进的非线性THP预编码

Improved Nonlinear Tomlinson-Harashima Precoding Over Multipath Fading Channels

Tomlinson-Harashima Precoding(称为THP预编码),是一种基于发送端的非线性去相关干扰抵消方法,可以消除直扩码分多址系统下行链路由于多径衰落信道造成的多址干扰(MAI)。因为发送端采用分集合并和MAI抵消技术,大大简化了移动用户接收机。本文提出了两种THP设计方案,预RakeTHP和多径去相关THP(MDTHP),并且通过仿真将它们与传统的线性预编码、Rake和发送端PreRake技术进行了比较。

This paper researches on Tomlinson-Harashima precoding, which is a Transmitter（Tx）-based nonlinear decorrelating interference cancellation scheme, to combat multiple access interference（MAI） for the downlink of Direct Sequence Code Division Multiple Access （DS-CDMA） system in multipath fading channels. Because diversity combining and MAI cancellation are employed in the transmitter, the mobile user receivers are greatly reduced. We propose two THP designs, PreRake THP and Multipath Decorrelating THP （MDTHP）, are compared with conventional linear precoding, Rake and Transmitter（Tx）-based PreRake technology by simulation.