Villacrés Grace, Koch Tobias, Sezgin Aydin, Vazquez-Vilar Gonzalo
Signal Theory and Communications Department, Universidad Carlos III de Madrid, 28911 Leganés, Spain.
Gregorio Marañón Health Research Institute, 28007 Madrid, Spain.
Entropy (Basel). 2018 Nov 12;20(11):870. doi: 10.3390/e20110870.
This paper studies a bursty interference channel, where the presence/absence of interference is modeled by a block-i.i.d. Bernoulli process that stays constant for a duration of symbols (referred to as coherence block) and then changes independently to a new state. We consider both a quasi-static setup, where the interference state remains constant during the whole transmission of the codeword, and an ergodic setup, where a codeword spans several coherence blocks. For the quasi-static setup, we study the largest rate of a coding strategy that provides reliable communication at a basic rate and allows an increased (opportunistic) rate when there is no interference. For the ergodic setup, we study the largest achievable rate. We study how non-causal knowledge of the interference state, referred to as (), affects the achievable rates. We derive converse and achievability bounds for (i) local CSI at the receiver side only; (ii) local CSI at the transmitter and receiver side; and (iii) global CSI at all nodes. Our bounds allow us to identify when interference burstiness is beneficial and in which scenarios global CSI outperforms local CSI. The joint treatment of the quasi-static and ergodic setup further allows for a thorough comparison of these two setups.
本文研究了一个突发干扰信道，其中干扰的存在与否由一个分组独立同分布（i.i.d.）的伯努利过程建模，该过程在 个符号的持续时间内（称为相干块）保持恒定，然后独立地改变到一个新状态。我们考虑两种情况：一种是准静态设置，其中干扰状态在码字的整个传输过程中保持恒定；另一种是遍历设置，其中一个码字跨越多个相干块。对于准静态设置，我们研究一种编码策略的最大速率，该策略以基本速率提供可靠通信，并在无干扰时允许增加（机会性）速率。对于遍历设置，我们研究最大可实现速率。我们研究干扰状态的非因果知识（称为 ）如何影响可实现速率。我们推导了以下三种情况下的逆界和可达界：（i）仅在接收端的局部信道状态信息（CSI）；（ii）发射端和接收端的局部 CSI；（iii）所有节点的全局 CSI。我们的界使我们能够确定干扰突发性何时有益，以及在哪些场景下全局 CSI 优于局部 CSI。对准静态和遍历设置的联合处理进一步允许对这两种设置进行全面比较。
