Interference Channels With Rate-Limited Feedback
Interference Channels With Rate-Limited Feedback
复制标题
具有速率限制反馈的干扰通道
DOI：
10.1109/tit.2011.2181938
复制
发表时间：
2011
影响因子：
2.5
通讯作者：
A. Avestimehr
中科院分区：
文献类型：
--
作者：
Alireza Vahid;Changho Suh;A. Avestimehr
我们考虑了速率受限反馈的两用户干扰信道。相关的工作集中在反馈链路具有无限容量的情况下，而没有研究已经做了速率限制的反馈问题。几个新的挑战出现，由于反馈链路的容量限制，无论是在推导的内部边界和外部边界。我们在三种不同的干扰模型下研究这个问题：El Gamal-Costa确定性模型、线性确定性模型和高斯模型。对于前两个模型，我们开发了一个可实现的方案，采用三种技术：汉小林消息分裂，量化和分仓，解码和转发。我们还推导出新的外边界的所有三个模型，我们表明我们的计划下的线性确定性模型的最优性。在高斯的情况下，我们提出了一个传输策略，采用格码，灵感来自前两个模型中开发的想法。对于对称的信道增益，我们证明了所提出的方案和我们的新的外部边界的可实现的和速率之间的差距是有界的一个常数的比特数，独立的信道增益。
We consider the two-user interference channel with rate-limited feedback. Related prior works focus on the case where feedback links have infinite capacity, while no research has been done for the rate-limited feedback problem. Several new challenges arise due to the capacity limitations of the feedback links, both in deriving inner bounds and outer bounds. We study this problem under three different interference models: the El Gamal-Costa deterministic model, the linear deterministic model, and the Gaussian model. For the first two models, we develop an achievable scheme that employs three techniques: Han-Kobayashi message splitting, quantize-and-binning, and decode-and-forward. We also derive new outer bounds for all three models and we show the optimality of our scheme under the linear deterministic model. In the Gaussian case, we propose a transmission strategy that incorporates lattice codes, inspired by the ideas developed in the first two models. For symmetric channel gains, we prove that the gap between the achievable sum rate of the proposed scheme and our new outer bounds is bounded by a constant number of bits, independent of the channel gains.