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OFDM系统中的差分调制及其性能 被引量:2

Differential Modulation and Its Performance in OFDM Systems
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摘要 基于子载波采用高阶差分幅度相移键控(MDAPSK)的正交频分复用(OFDM)系统,针对其独特的数据帧结构,提出并定义了OFDM系统的几种差分调制方案,仿真了不同信道环境下各种方案的误码性能。仿真结果表明,针对时间选择性和频率选择性衰落信道衰落程度的不同,在满足一定的时间相关性和(或)频率相关性的条件下,采用相应的时域和(或)频域差分调制方案,可以保证MDAPSK-OFDM系统的误比特率(BER)维持在较低的水平。 Considering the special structure of transmitted data in orthogonal frequency division multiplexing (OFDM) systems, some differential modulation schemes are presented and defined for differential amplitude and phase shift keying (DAPSK) modulation in OFDM systems. The bit error rate (BER) performance is simulated with these modulation schemes respectively in different channels. The simulation results show that the BERs of Multilevent DAPSK (MDAPSK) OFDM systems can be maintained at a lower level relatively if the time correlation or (and) frequency correlation is satisfied and a proper time-domain or (and) frequency domain differential modulation scheme is applied under time-selective and frequency-selective fading channels.
出处 《铁道学报》 EI CAS CSCD 北大核心 2006年第1期59-62,共4页 Journal of the China Railway Society
基金 国家863计划课题任务合同(2001AA123016)
关键词 正交频分复用 差分幅度相移键控 时域差分 频域差分 时间相关性 频率相关性 orthogonal frequency division multiplexing (OFDM) differential amplitude and phase shift keying(DAPSK) ~ time domain differential~ frequency-domain differential time correlation frequency correlation
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参考文献8

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同被引文献7

  • 1陆浩,陈静,朱琦,张澍泽.差分调制在OFDM系统中的应用[J].中国数据通信,2005,7(1):40-46. 被引量:2
  • 2LIU Kai-ming,WANG Wen-bo,LIU Yuan-an.High Data Rate OFDM System with Simplified DAPSK Demodulation[J].The Journal of China Universities of Posts and Telecommunications,2005,12(2):30-34. 被引量:3
  • 3Proakis J G, Sozer E M, Rice J A, et al. Shallow water acoustic networks[J]. Communications Magazine, 2001,39 ( 11 ) : 114 - 119.
  • 4Hayri Sari,Bryan Woodward. Underwater acoustic voice communi- cation using digital pulse position modulation [ C] //OCEANS ' 97. MTS/ IEEE Conference Proceedings. Halifax, NS: IEEE, 1997:870 - 874.
  • 5McCree A, Truong K, George E B,et al. A 2.4 kbit/s MELP co- der candidate for the new U. S. Federal Standard [ C ] ///Acous- tics, Speech, and Signal Processing, Atlanta, GA: ICASSP, 1996 : 200 - 203.
  • 6Tahereh Fazel and Thomas Fuja. Robust transmission of MELP- compressed speech:an illustrative example of joint source-channel decodlng[ J ]. IEEE Transaction on Communications, 2003,51 (6) :973 -982.
  • 7Khalid H. Sayhood Wu Lenan (Radio Engineering Department, Southeast University, Nanjing 210096).DIFFERENTIAL AMPLITUDE PHASE SHIFT KEYING: A NEW MODULATION METHOD FOR TURBO CODE IN DIGITAL RADIO BROADCASTING[J].Journal of Electronics(China),2003,20(2):86-96. 被引量:2

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