标题： 并行中继网络的分布式功率分配策略 显示英文标题

标题： Distributed Power Allocation Strategies for Parallel Relay Networks

摘要： 我们考虑一个由并行再生解码转发中继通过正交信道协助的源-目的地对。 我们研究了在源和中继节点处具有有限信道状态信息的该系统的分布式功率分配策略。 我们首先提出一种分布式决策机制，使每个中继能够单独决定是否转发源数据。 该决策机制要求每个能够从源解码信息的中继将其到目的地的信道增益与给定的阈值进行比较。 我们确定了最优的分布式功率分配策略，在提供目标信噪比和目标中断概率的同时，最小化总发射功率。 该策略规定了源功率以及中继处的阈值的最佳选择。 接下来，我们考虑两种更简单的分布式功率分配策略，即被动源模型，其中源功率和中继阈值是固定的，以及单中继模型，其中只允许一个中继转发源数据。 这些模型是由于可用信道状态信息的限制以及与最优分布式策略相比更容易实现而提出的。 给出了仿真结果以展示所提出的分布式功率分配方案的性能。 具体来说，与随机中继选择相比，所提出的方法显示出显著的功率节省。 显示英文摘要

摘要： We consider a source-destination pair assisted by parallel regenerative decode-and-forward relays operating in orthogonal channels. We investigate distributed power allocation strategies for this system with limited channel state information at the source and the relay nodes. We first propose a distributed decision mechanism for each relay to individually make its decision on whether to forward the source data. The decision mechanism calls for each relay that is able to decode the information from the source to compare its relay-to-destination channel gain with a given threshold. We identify the optimum distributed power allocation strategy that minimizes the total transmit power while providing a target signal-to-noise ratio at the destination with a target outage probability. The strategy dictates the optimum choices for the source power as well as the threshold value at the relays. Next, we consider two simpler distributed power allocation strategies, namely the passive source model where the source power and the relay threshold are fixed, and the single relay model where only one relay is allowed to forward the source data. These models are motivated by limitations on the available channel state information as well as ease of implementation as compared to the optimum distributed strategy. Simulation results are presented to demonstrate the performance of the proposed distributed power allocation schemes. Specifically, we observe significant power savings with proposed methods as compared to random relay selection.