北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (5): 998-1003.doi: 10.13700/j.bh.1001-5965.2016.0351

• 论文 • 上一篇    下一篇

基于SOVA的低复杂度FTN信号接收算法

张晨宇, 刘荣科   

  1. 北京航空航天大学 电子信息工程学院, 北京 100083
  • 收稿日期:2016-04-28 出版日期:2017-05-20 发布日期:2017-05-27
  • 通讯作者: 刘荣科,E-mail:rongke_liu@buaa.edu.cn E-mail:rongke_liu@buaa.edu.cn
  • 作者简介:张晨宇,男,硕士研究生。主要研究方向:超奈奎斯特传输技术、空天信息网络;刘荣科,男,博士,教授,博士生导师。主要研究方向:空天信息网络、多媒体通信与计算、专用集成电路设计。
  • 基金资助:
    国家自然科学基金(91438116);上海航天科技创新基金(SAST2015089)

Low-complexity algorithm for FTN signal based on SOVA

ZHANG Chenyu, LIU Rongke   

  1. School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2016-04-28 Online:2017-05-20 Published:2017-05-27
  • Supported by:
    National Natural Science Foundation of China (91438116);Shanghai Innovation Foundation of Aerospace Science and Technology (SAST2015089)

摘要: 超奈奎斯特(FTN)传输技术是一种高频谱效率的信号传输方式。针对FTN信号存在的码间串扰,基于软输出维特比算法 (SOVA)提出FTN信号的低复杂度接收算法。根据幸存路径和竞争路径的判决结果,动态地调整每个时刻回溯过程的比较次数,降低比较次数平均值。在实际应用中,根据不影响误码性能的统计经验值直接截短回溯路径的长度。直接截短回溯深度算法可在不恶化误码率 (BER)的前提下,降低比较运算次数2/3,同时减少回溯过程所需寄存器资源和延时50%以上。

关键词: 超奈奎斯特(FTN)传输信号, 低复杂度, 回溯过程, 比较次数, 寄存器资源

Abstract: Faster-than-Nyquist (FTN) signaling is a transmission method with high bit density and inevitable inter-symbol interference. Based on soft output Viterbi algorithm (SOVA), a low complexity receiver for FTN was introduced. The number of comparison in the backtracking process was adjusted by the result of survivor path and competitive path, and was reduced during the process. In application, a fixed backtracking length was searched and defined by statistical value, which was shorter than that in SOVA. The presented method reduces the complexity and time delay in the FTN signal detector. Without deteriorating bit error rate (BER), the number of comparison operations is reduced by 2/3, the number of registers is reduced by more than 50%, and the system delay is reduced by more than 50%.

Key words: faster-than-Nyquist (FTN) signaling, low complexity, backtracking process, number of comparison, number of registers

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