Refined analysis of the Poisson channel in the high-photon-efficiency regime
Refined analysis of the Poisson channel in the high-photon-efficiency regime
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高光子效率状态下泊松通道的精细分析
DOI：
10.1109/itw.2012.6404742
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
G. Wornell
中科院分区：
文献类型：
--
作者：
Ligong Wang;G. Wornell
我们研究其平均输入功率（在每个通道使用中）不得超过某些常数ε，我们考虑宽带，高光效率极端，而ε在ε接近零的位置，并且在频道的位置，则不得超过某些常数。 “深色电流”以ε的比例接近零。术语。我们还表明，脉冲位置调制在此通道上是最佳的，直到容量为二阶。
We study the discrete-time Poisson channel under the constraint that its average input power (in photons per channel use) must not exceed some constant ε. We consider the wideband, high-photon-efficiency extreme where ε approaches zero, and where the channel's “dark current” approaches zero proportionally with ε. Improving over a previously obtained first-order capacity approximation, we derive a refined approximation which also includes the second-order term. We also show that pulse-position modulation is optimal on this channel up to the second-order term in capacity.