無背景噪聲下的光PPM信道容量分析
ANALYSIS OF OPTICAL PPM CHANNEL CAPACITY WITHOUT BACKGROUND NOISE
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摘要: 通過對無背景噪聲下光脈沖位置調(diào)制(PPM)信道容量的分析，證明：光PPM信道容量除受系統(tǒng)時間分辨率(帶寬)限制外，還受信道脈沖功率的限制，實際上對功率受限信道，無限減小時隙寬度反而使光PPM信道容量趨于零，有一個最佳的時隙寬度使功率受限的PPM信道容量最大。存在最佳的PPM符號數(shù)(傳信時隙數(shù))使信道傳輸率和信道容量能量效率(比特／光子)最大，這些結(jié)論為光PPM系統(tǒng)參數(shù)的優(yōu)化設(shè)計提供了依據(jù)。
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關(guān)鍵詞:
- 光PPM通信;信道容量;優(yōu)化設(shè)計
Abstract: The capacity of the optical pulse-position modulation (PPM) channel without background noise is examined.It is shown that the channel capacity is limited not only by the available time resolution (bandwidth) but also by the available pulse power.In fact,as the PPM slot width decreases infinitely,the channel capacity will approach to zero in the power limited channel.There exist the PPM slot width that optimizes the channel capacity and the PPM alphabet sizes that maximize the efficiencies of throughput and energy.These results provide the basis for designing optimum PPM system parameters. -
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