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    題名: Continuous Phase Modulation (CPM) Revisited: Using Time-limited Phase Shaping Pulses
    作者: Yang, Richard Hsin-Hsyong;Lee, Chia-Kun;Chern, Shiunn-Jang
    貢獻者: 淡江大學電機工程學系
    關鍵詞: Continuous Phase Modulation;Time-limited Phase Shaping
    日期: 2013-11-01
    上傳時間: 2013-11-01 21:43:19 (UTC+8)
    出版者: Tokyo: Denshi Jouhou Tsuushin Gakkai
    摘要: Conventional CPM signals employ information sequence with time-unlimited phase shaping pulse (PSP) to achieve power and bandwidth efficient transmission. On the contrary, information sequence using time-limited PSP was believed to produce power-wasting data-independent discrete spectral lines in CPM spectra, and was suggested to be avoided.
    In this paper, we revisit this problem and adopt the time-limited PSP to replace the one with time-unlimited, it turns out to have an alternative solution to the CPM scheme. We first modify the spectral computing formula for the CPM with time-limited PSP (or CPM-TL) from conventional CPM formula and show that the discrete spectral lines appeared in the power density spectrum of CPM-TL signals can be diminished or become negligible by appropriately choosing PSP. We also show that this class of CPM can use any real number modulation index (h) and the resultant trellis structure of CPM guarantees the maximum constraint length allowed by the number of states in the MLSD receiver. Finally, the energy-bandwidth performance of CPM using time-limited PSP is investigated and compared with conventional CPM with time-unlimited PSP. From numerical results we show that, under the same number of states in the MLSD receiver and bandwidth occupancy, this subclass of CPM could outperform the conventional CPM up to 6 dB coding gain, for h < 1, in many cases.
    關聯: IEICE Transactions on Communication E96-B(11), pp.2828-2839
    顯示於類別:[電機工程學系暨研究所] 期刊論文

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