采用复合调制的AM广播功率谱分析

Journal of Applied Sciences ›› 2007, Vol. 25 ›› Issue (6): 583-583 .

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Power Spectrum Density Analysis on AM Broadcasting Using Hybrid Modulation

QI Chen-hao, WU Le-nan

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

Abstract

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

QI Chen-hao;WU Le-nan. Power Spectrum Density Analysis on AM Broadcasting Using Hybrid Modulation[J]. Journal of Applied Sciences, 2007, 25(6): 583-583 .

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