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应用科学学报 ›› 2004, Vol. 22 ›› Issue (3): 273-278.

• 论文 • 上一篇    下一篇

一种新的软判决度量及其在多径衰落信道中的性能

李强, 毕光国, 杜鹏   

  1. 东南大学移动通信国家重点实验室 江苏南京 210096
  • 收稿日期:2003-08-12 修回日期:2003-11-28 出版日期:2004-09-30 发布日期:2004-09-30
  • 作者简介:李强(1974-),male,Neimenggu,Doctor.
  • 基金资助:
    Project Supported by 86 3 Program of China Under Grant (2001AA123015)

Performance of Generalized Soft Decision Metric Without Noise Variance Knowledge over Multipath Fading Channel

LI Qiang, BI Guang-guo, DU Peng   

  1. National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
  • Received:2003-08-12 Revised:2003-11-28 Online:2004-09-30 Published:2004-09-30
  • Supported by:
    Project Supported by 86 3 Program of China Under Grant (2001AA123015)

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被引次数

1

摘要： 提出了一种新的简化软判决度量,并进一步推广到一般的p范数情形,得到了广义的简化软判决度量生成办法.同时给出了几种不同参数下LDPC编码的16QAM/64QAM系统的误比特率性能的计算机仿真结果.仿真结果表明,无论是在AWGN信道还是在多径衰落信道中,所提出的简化方法都没有性能损失.更重要的是,由于无需噪声方差估计,该方法可以简化系统实现,大大降低了实现的复杂度.进一步的计算机仿真显示,在高信噪比的多径信道中,当p略小于2时,广义的简化软判决度量比传统方法的误比特率性能要好.

关键词: 软判决度量, 衰落信道, 低密度校验码

Abstract: A new simplified soft decision metric, without noise variance knowledge, is derived in this paper. By recognizing that it is simply a distance metric in Euclidian space, we further generalize it to p-norm. Performance comparisons are presented for LDPC coded 16QAM/64QAM with different parameters. Simulation results show that, as compared with the simplified soft decision metric reported in ref.[6], there is no performance loss with our proposed generalized soft decision metric for both AWGN and multipath fading channel. Moreover, it is unnecessary to estimate noise variance at channel output, which greatly facilitates practical implementation. Further simulation indicates that, in multipath fading channel, a performance gain can be obtained with p a bit less than 2 at high signal to noise ratio.

Key words: soft decision metric, LDPC, fading channel

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