论文标题
两用户IM/DD干扰通道的容量界限
Capacity Bounds for the Two-User IM/DD Interference Channel
论文作者
论文摘要
本文研究了两用户强度调节/直接检测（IM/DD）干扰通道（IC）的能力，这在多用户光学无线通信的背景下相关。尽管对一般离散无机ICS进行了一些已知的单个字母容量表征，但IM/DD IC的可计算能力表达仍缺少。在本文中，在峰值和平均光学强度约束下，我们为一般的两用户IM/DD IC提供紧密且易于计算的内边界。在对称情况下，界限能够表征强和弱干扰方案中的渐近总和率能力以及广义自由度（GDOF）。使用所获得的边界，IM/DD IC的GDOF显示出具有类似于具有功率约束的高斯IC的“ W”形状。在不同的干扰方案中，获得的界限还进行了数值评估，以显示其紧密度，并用于研究片上和室内OWC系统的性能。
This paper studies the capacity of the two-user intensity-modulation/direct-detection (IM/DD) interference channel (IC), which is relevant in the context of multi-user optical wireless communications. Despite some known single-letter capacity characterizations for general discrete-memoryless ICs, a computable capacity expression for the IM/DD IC is missing. In this paper, we provide tight and easily computable inner and outer bounds for a general two-user IM/DD IC under peak and average optical intensity constraints. The bounds enable characterizing the asymptotic sum-rate capacity in the strong and weak interference regimes, as well as the generalized degrees of freedom (GDoF) in the symmetric case. Using the obtained bounds, the GDoF of the IM/DD IC is shown to have a `W' shape similar to the Gaussian IC with power constraints. The obtained bounds are also evaluated numerically in different interference regimes to show their tightness, and used to study the performance of on-chip and indoor OWC systems.
