计算机工程 ›› 2008, Vol. 34 ›› Issue (14): 20-22.doi: 10.3969/j.issn.1000-3428.2008.14.008

• 博士论文 • 上一篇    下一篇

低复杂度的时域同步OFDM信号检测算法

郭永正,安建平,夏彩杰   

  1. (北京理工大学信息科学技术学院电子工程系,北京 100081)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-07-20 发布日期:2008-07-20

Low-complexity Signal Detection Algorithm for TDS-OFDM

GUO Yong-zheng, AN Jian-ping, XIA Cai-jie   

  1. (Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081)
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-07-20 Published:2008-07-20

摘要: 构造一种在所有正交频分复用(OFDM)符号中使用同一PN序列作为保护间隔的时域同步OFDM信号格式,提出一种基于快速傅里叶变换的PN码干扰消除和信号检测算法,该算法不使用FIR均衡技术,复杂度低,仅与常规CP-OFDM信号检测算法的复杂度相当,但由于引入了部分保护间隔内的噪声,因此BER性能不如CP-OFDM系统。仿真结果表明,在典型的双径短波信道中,两者的BER性能差距小于0.1 dB,在信道时域扩展较大的四径短波信道中,两者的BER性能差距小于1 dB。

关键词: 信号检测, 时域同步正交频分复用, 基于循环前缀的OFDM

Abstract: A new Orthogonal Fre-quency Division Multiplexing(OFDM) signal structure is constructed by using the same PN sequence as guard interval for Time Domain Synchronous Orthogonal Fre-quency Division Multiplexing(TDS-OFDM) system. A low- complexity PN subtraction and signal detection algorithm is proposed based on FFT. The complexity of the algorithm is similar to that of the regular Cyclic Prefix OFDM(CP-OFDM) without complex FIR equalizer. Because some noises in guard interval are introduced to the signal detection, the BER performance of the algorithm degrades compared with that of CP-OFDM. Simulation results show that their BER performance difference is less than 0.1 dB in typical 2-path HF channel, while the performance difference is less than 1 dB in 4-path HF channel whoes time spread is relatively large.

Key words: signal detection, Time Domain Synchronous Orthogonal Fre-quency Division Multiplexing(TDS-OFDM), Cyclic Prefix OFDM(CP-OFDM)

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