论文标题
关于IM/DD广播频道中均匀间隔离散均匀分布的可实现速度
On Achievable Rates of Evenly-Spaced Discrete Uniform Distributions in the IM/DD Broadcast Channel
论文作者
论文摘要
在光学无线通信中，采用强度调制和直接检测（IM/DD）的广播通道（BC）通常被建模为峰值约束BC。尚不清楚其峰约束BC的容量区域的封闭式表达。本文介绍了通过一类离散输入分布（特别是均匀间隔的离散均匀分布（ESDU））实现的分析能力内部结合。与提供基准的连续输入分布相反，ESDU在应用峰约束的高斯通道时更有希望。新获得的容量内结合易于计算，并且在数值上显示比基准更紧密。此外，我们指出了新开发的ESDU速率的分析上限，在所有测试的设置中都很紧。
In optical wireless communications, a broadcast channel (BC) employing intensity modulation and direct detection (IM/DD) is often modelled as a peak-constrained BC. A closed-form expression for its capacity region of the peak-constrained BC is not known. This paper presents an analytical capacity inner bound for the peak-constrained Gaussian BC achieved by a class of discrete input distribution, specifically, the evenly-spaced discrete uniform distribution (ESDU). In contrast to the continuous input distribution that provides the benchmark, ESDU is more promising in the application of peak-constrained Gaussian channels. The newly obtained capacity inner bound is easily-computable and is numerically shown to be tighter than the benchmark. Besides, we remark the newly developed analytical upper bound for the ESDU rate, which is tight in all tested settings.
