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http://dx.doi.org/10.12815/kits.2017.16.5.152

Design and Performance Analysis of CPSK Transmitter for RF-CBTC System in ISM Band  

Kim, Seong-Cheol (Dept. of Raiload Electrical System Eng., Univ. of Woosong)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.16, no.5, 2017 , pp. 152-161 More about this Journal
Abstract
The CBTC(Communication based Train Control) system employed on 2.4GHz ISM band adopt the IEEE802.11.x standard. Therefor communication time delay, distortion and data losses will be produced. To overcome these problems, CPSK(Continuous Phase shift keying) modulated DS/SS(Direct Sequence Spread Spectrum) transmitter with 908MHz carrier frequency is proposed. Through the eye diagram and scatter diagram the performance is analysed. And the phase noise characteristic of the local oscillator is measured about 60dBc/Hz, this means that the phase noise performance is very good compared to the signal. Reference frequency suppression of the 2nd local oscillator is 50dB below compared to the signal. Through the polarities of the complementary signal equally probable, the line spectrum of the output spectrum is eliminated. The nonlinear effects which introduce the spectral spreading or spectral regeneration is reduced remarkably.
Keywords
CBTC; ISM; Phase Noise; Output Spectrum; Scatter Diagram;
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