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  1. (清华大学 微波与数字通信国家重点实验室,北京 100084)
  • 收稿日期:2008-05-09 修回日期:1900-01-01 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 李海涛

Water-filling precoder for single-carrier communication systems

LI Hai-tao;LIN Xiao-kang

  1. (State Key Lab. of Micro. and Digital Comm., Dept. of Electronic Eng., Tsinghua Univ., Beijing 100084, China)
  • Received:2008-05-09 Revised:1900-01-01 Online:2008-12-20 Published:2008-12-20
  • Contact: LI Hai-tao

摘要: 针对码间干扰信道下的单载波频域均衡系统,提出了一种可以在频域快速实现的注水预编码.该预编码的引入不需要增加循环前缀的长度,也不会在接收机端产生额外的均衡开销.在信息论上,证明了应用注水预编码的叠加码在基于线性最小均方误差准则的频域均衡检测下可以实现信道容量.基于单层卷积码的仿真结果表明,注水预编码可以取得1~2dB的功率增益.

关键词: 单载波通信系统, 频域均衡, 码间干扰信道, 预编码

Abstract: A water-filling precoder is proposed for shaping the spectrum of transmitted signals in single-carrier systems over inter-symbol interference (ISI) channels. This precoder can be efficiently implemented in the frequency domain without incurring extra receiver complexity. Furthermore, it does not increase the required length of the cyclic prefix (CP). It is proved in the information theory that with the water-filling precoder, superposition codes can achieve the ISI channel’s capacity with linear-minimum-mean-square-error (LMMSE)-based frequency domain equalization. Simulation results based on single-layer convolutional codes show that a power gain of 1~2dB can be achieved by the water-filling precoder.

Key words: single-carrier communication systems, frequency-domain equalization, inter-symbol interference channels, precoder


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