北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2010, Vol. 33 ›› Issue (2): 39-43.doi: 10.13190/jbupt.201002.39.262

• 论文 • 上一篇    下一篇

基于DCT的OFDMNMSK/NQMSK系统及其性能分析

翁玮文 1 刘元安 1 胡鹤飞 2 袁东明 1   

  1. (1北京邮电大学电子工程学院, 北京 100876; 2北京邮电大学信息与通信工程学院,北京 100876)
  • 收稿日期:2009-06-21 修回日期:2009-09-27 出版日期:2010-04-28 发布日期:2010-04-28
  • 通讯作者: 刘元安
  • 作者简介:翁玮文(1978—), 男, 博士生, Email: wengww@263.net; 刘元安(1963—), 男, 教授, 博士生导师.
  • 基金资助:

    国家自然科学基金项目(60802033);中瑞合作IMTA项目(2008DFA11780); 国家高技术研究发展计划项目(2008AA01Z211)

Performance Analysis of OFDMNMSK/NQMSK Systems Based on DCT

WENG Weiwen1, LIU Yuanan1, HU Hefei2, YUAN Dongming1   

  1. (1School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; 2School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China)
  • Received:2009-06-21 Revised:2009-09-27 Online:2010-04-28 Published:2010-04-28
  • Contact: Yuan-An Liu

摘要:

提出了一类基于离散余弦变换(DCT)的正交频分复用(OFDM)-N重最小频移键控(NMSK)/N重正交最小频移键控系统(NQMSK). 该类系统将NMSK调制方式与基于DCT的OFDM多载波技术结合在一起,尽管系统频谱利用率有所降低,但却有效改善了系统带外衰减并减弱载波频率偏移所引起的性能恶化. 理论分析和仿真结果表明,无论是在加性高斯白噪信道下还是在瑞利衰落信道下,考虑到载波频率偏移等因素的影响,该类系统都展示了其优越性能.

关键词: 离散余弦变换, 正交频分复用, N重最小频移键控, 载波频率偏移, 载波间干扰

Abstract:

One type of orthogonal frequency division multiplexing (OFDM)-N minimumshift keying (NMSK)/N quadrature MSK (NQMSK) system based on discrete cosine transform (DCT) is proposed. By combining the NMSK modulation scheme with the OFDM technology based on DCT, although the frequency efficiency is reduced to some extend, it can improve the outofband attenuation greatly and the performance deterioration caused by carrier frequency offset (CFO) will be mitigated. In the presence of CFO, analysis and simulation results show the excellent performance of the OFDMNMSK/NQMSK system based on DCT over both additive white Gaussian noise (AWGN) and Rayleigh fading channels. 

Key words: discrete cosine transform, orthogonal frequency division multiplexing, N minimum-shift keying, carrier frequency offset, inter-carrier interference