论文标题
通过最佳功率分配的HARQ重新传播方案的超可靠通信
Ultra Reliable Communication via Optimum Power Allocation for HARQ Retransmission Schemes
论文作者
论文摘要
在这项工作中，我们开发了低复杂性，最佳功率分配算法，这些算法将通过使用Karush-Kuhn-Tucker（KKT）条件在有限的区块长度策略中以最低功率消耗在任何中断概率目标下进行超可靠操作。在我们的设置中，我们假设发射器不知道通道状态信息（CSI）。首先，我们表明，通过使用开放循环设置实现非常低的数据包的概率需要极高的功耗。因此，我们诉诸于作为解决方案的重新传播方案，即自动重复请求（ARQ），CHASE结合混合ARQ（CC-HARQ）和增量冗余（IR）HARQ。国家使用经典方法，在每个变速箱中分配同等功率是最佳的，我们表明，对于在超可靠制度（URR）中的运营，最佳策略表明，每轮都具有增量功率。从数值上讲，我们评估了提出的协议的功率收益。我们表明，最好的节能是由IR-HARQ协议给出的。此外，我们表明，与一射击传输相比，这些协议可以实现大量平均功率和最大功率。最后，我们表明，传输的数量越大，将获得越大的功率增益。
In this work, we develop low complexity, optimal power allocation algorithms that would allow ultra reliable operation at any outage probability target with minimum power consumption in the finite blocklength regime by utilizing Karush-Kuhn-Tucker (KKT) conditions. In our setup, we assume that the transmitter does not know the channel state information (CSI). First, we show that achieving a very low packet outage probability by using an open loop setup requires extremely high power consumption. Thus, we resort to retransmission schemes as a solution, namely Automatic Repeat Request (ARQ), Chase Combining Hybrid ARQ (CC-HARQ) and Incremental Redundancy (IR) HARQ. Countrary to classical approaches, where it is optimal to allocate equal power with each transmission, we show that for operation in the ultra reliable regime (URR), the optimal strategy suggests transmission with incremental power in each round. Numerically, we evaluate the power gains of the proposed protocol. We show that the best power saving is given by IR-HARQ protocol. Further, we show that when compared to the one shot transmission, these protocols enable large average and maximum power gains. Finally, we show that the larger the number of transmissions is, the larger power gains will be attained.
