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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/75288


    Title: A simple spectra computing approach for continuous-phase phase modulation (CPPM)
    Authors: Yang, Richard Hsin-hsyong;Lee, Chia-kun;Chern, Shiunn-jang
    Contributors: 淡江大學電機工程學系
    Keywords: Continuous-phase Modulation;Power Spectrum;Digital PM;Autocorrelation Function Approach
    Date: 2011-12-07
    Issue Date: 2012-03-17 19:00:46 (UTC+8)
    Publisher: Institute of Electrical and Electronics Engineers
    Abstract: Recently, we have developed a special class of continuous-phase modulation (CPM) scheme, called the continuous-phase phase modulation (CPPM); it transmits the PAM information sequences using time-limited phase shaping pulses. In this paper, the power spectra for this novel CPM are investigated. We employ autocorrelation function approach to modify the CPM spectra computing formula for time-limited phase shaping pulse. Since CPPM is a CPM modulator with time-limited phase shaping function, previous research believed that such modulator will have data-independent spectral lines and suggested to be avoided. However, we show that the spectral lines can be diminished by choosing appropriate modulation index, modulation level and phase shaping pulse. Spectra for two classes of CPPM schemes are given. It is shown that the bandwidth of CPPM scheme can be effectively reduced by using smaller modulation index andlor increasing the correlative length and modulation level. The resultant CPPM schemes have attractive spectral occupancy as compared to conventional CPM.
    Relation: 2011 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), Chiang Mai, Thailand
    DOI: 10.1109/ISPACS.2011.6146115
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Proceeding

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