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Multiple access and two-way channels with energy harvesting and bi-directional energy cooperation

机译：具有能量收集和双向能源合作的多种访问和双向通道

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This paper considers the multiple access and two-way channels with energy harvesting transmitters that can cooperate by transferring energy to each other. Specifically, the jointly optimal transmit power allocation and energy transfer policies that achieve the sum-capacity in both models are found. These models were first considered in previous work with unidirectional energy transfer, and optimal policies were found using a two-dimensional water-filling algorithm. In this paper, the bi-directional extension of the energy cooperation model is considered. Using an equivalent energy transfer efficiency representation, it is found that in the optimal policy, a node cannot simultaneously send and receive energy. It is shown that a class of power policies termed procrastinating policies include at least one optimal policy, leading to the insight that the resulting power allocation problem can be solved by a one-dimensional directional water-filling algorithm. It is observed that in the multiple access channel, a node either transfers no energy, or transfers all of its energy to a single user to achieve sum-capacity. For the two-way channel, the optimal policy is found to have a directional water-filling interpretation with two non-mixing fluids whenever optimal energy transfer is non-zero.
机译：本文考虑了具有能量收集的多通道和双向通道，可以通过将能量彼此转移来协作。具体而言，找到了在两个模型中实现总和的共同最佳的发射功率分配和能量转移策略。在以前的工作中首次考虑了这些模型，使用单向能量转移，并使用二维水填充算法找到最佳政策。在本文中，考虑了能量合作模型的双向延伸。使用等效的能量传输效率表示，发现在最佳策略中，节点不能同时发送和接收能量。结果表明，一类被称为拖延政策的电力策略包括至少一个最佳政策，导致能够通过一维方向水填充算法解决所得到的功率分配问题。观察到，在多访问通道中，节点无要么传输能量，或者将其所有能量传输到单个用户以实现总和容量。对于双向通道，发现最佳策略具有定向水填充解释，每当最佳能量转移非零时，具有两个非混合液。

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