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采用复合调制的AM广播功率谱分析

戚晨皓，吴乐南   

  1. 东南大学 信息科学与工程学院, 江苏 南京 210096
  • 收稿日期:2007-06-27 修回日期:2007-09-03 出版日期:2007-11-30 发布日期:2007-11-30

Power Spectrum Density Analysis on AM Broadcasting Using Hybrid Modulation

QI Chen-hao, WU Le-nan   

  1. School of Information Science and Engineering, Southeast University, Nanjing 210096, China
  • Received:2007-06-27 Revised:2007-09-03 Online:2007-11-30 Published:2007-11-30

被引次数

18

摘要： 分析采用EBPSK/DSB-AM复合调制的AM广播发射信号功率谱，给出复合传输系统的结构和发射信号的波形表达式。以美国FCC规定的功率谱发射掩模和我国关于AM发射机基本参数的国家标准为具体指标，对比了通过几种不同的发射滤波器后复合调制信号的功率谱结构，以及相应的数据传输性能。系统仿真表明，在满足给定发射信号功率谱衰减和一定的信噪比条件下，模拟AM广播和EBPSK数据传输都能获得良好的性能。

关键词: 功率谱, AM广播, 扩展的二元相移键控, FCC功率谱掩模

Abstract: Power spectrum density (PSD) analysis for hybrid modulated signal is presented in the paper. The system, which combines extended binary phase shift keying (EBPSK) with double sideband amplitude modulation (DSB-AM), is introduced, and its waveform expression given. With regard to FCC’s(federal communications commission) AM spectral emission mask and China’s national standards on AM transmitter, comparisons are made on the effects of taking different band-pass filters into the hybrid system, and on the demodulation performances. Computer simulations demonstrate that good performance of both modulations can be obtained at certain SNR within the given PSD constraint.

Key words: power spectrum density (PSD), AM, EBPSK, FCC spectral mask