无背景噪声下的光PPM信道容量分析
ANALYSIS OF OPTICAL PPM CHANNEL CAPACITY WITHOUT BACKGROUND NOISE
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摘要: 通过对无背景噪声下光脉冲位置调制(PPM)信道容量的分析，证明：光PPM信道容量除受系统时间分辨率(带宽)限制外，还受信道脉冲功率的限制，实际上对功率受限信道，无限减小时隙宽度反而使光PPM信道容量趋于零，有一个最佳的时隙宽度使功率受限的PPM信道容量最大。存在最佳的PPM符号数(传信时隙数)使信道传输率和信道容量能量效率(比特／光子)最大，这些结论为光PPM系统参数的优化设计提供了依据。
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关键词:
- 光PPM通信;信道容量;优化设计
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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