On the Capacity Region of the Layered Packet Erasure Broadcast Channel with Feedback
On the Capacity Region of the Layered Packet Erasure Broadcast Channel with Feedback
复制标题
带反馈的分层分组擦除广播信道的容量域
DOI：
10.1109/icc.2019.8761871
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
N. Devroye
中科院分区：
文献类型：
--
作者：
Siyao Li;Daniela Tuninetti;N. Devroye
本文研究了具有信道输出反馈（COF）的分层包擦除广播信道（LPE-BC）的容量域。LPE-BC是Tse和Yates最近提出的衰落高斯BC的高SNR近似，Tse和Yates在没有COF时表征了任何数量的用户和任何数量的层的容量区域。本文推导了两个用户和任意层数的情况下，具有COF的LPE-BC的容量内界和外界。内界推广了两用户擦除BC的过去结果，这是具有仅一层COF的LPE-BC的特殊情况。新奇在于使用用户间和层间网络编码重传（对于仅由非预期用户接收的那些分组），其中每个随机线性组合可以涉及在任何层上最初发送的旨在用于任何用户的分组。分析和数值算例表明，所提出的外边界是最佳的一些LPE-BC。
In this paper the capacity region of the Layered Packet Erasure Broadcast Channel (LPE-BC) with Channel Output Feedback (COF) available at the transmitter is investigated. The LPE-BC is a high-SNR approximation of the fading Gaussian BC recently proposed by Tse and Yates, who characterized the capacity region for any number of users and any number of layers when there is no COF. This paper derives capacity inner and outer bounds for the LPE-BC with COF for the case of two users and any number of layers. The inner bounds generalize past results for the two-user erasure BC, which is a special case of the LPE-BC with COF with only one layer. The novelty lies in the use of inter-user & inter-layer network coding retransmissions (for those packets that have only been received by the unintended user), where each random linear combination may involve packets intended for any user originally sent on any of the layers. Analytical and numerical examples show that the proposed outer bound is optimal for some LPE-BCs.