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arXiv 1503.04381cs.ITmath.IT
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具有无线信息和能量传输的全双工中继的中继控制

Relay Control for Full-Duplex Relaying with Wireless Information and Energy Transfer

Hongwu Liu, Kyeong Jin Kim, H. Vincent Poor, Kyung Sup Kwak

摘要:

本研究探讨双跳放大转发全双工中继系统的无线信息与能量传输。通过将能量效率(EE)最大化问题转化为传输功率的凹分式规划,分别设计了三种中继控制方案,实现能量收集和全双工信息中继.在Rician衰落模型下,给出了最大中继、信干噪比(SINR)中继和目标中继的中断概率和各态历经容量的解析表达式。证明了最大继电器的EE最大化问题对于时间开关因子是凹的,从而应用二分法得到最优值。通过结合瞬时信道信息,SINR中继与附带的时间切换因子实现了改进的EE在延迟限制和延迟容忍传输中的最大中继。在不需要第二跳的信道信息的情况下,目标中继确保了中断概率,遍历容量和EE的竞争性能。与直接源-目的地传输相比,数值结果表明,所提出的中继方案是有益的,在实现低速率延迟限制传输的可比EE。

英文摘要:

This study investigates wireless information and energy transfer for dual-hop amplify-and-forward full-duplex relaying systems. By forming energy efficiency (EE) maximization problem into a concave fractional program of transmission power, three relay control schemes are separately designed to enable energy harvesting and full-duplex information relaying. With Rician fading modeled residual self-interference channel, analytical expressions of outage probability and ergodic capacity are presented for the maximum relay, signal-to-interference-plus-noise-ratio (SINR) relay, and target relay. It has shown that EE maximization problem of the maximum relay is concave for time switching factor, so that bisection method has been applied to obtain the optimized value. By incorporating instantaneous channel information, the SINR relay with collateral time switching factor achieves an improved EE over the maximum relay in delay-limited and delay-tolerant transmissions. Without requiring channel information for the second-hop, the target relay ensures a competitive performance for outage probability, ergodic capacity, and EE. Comparing to the direct source-destination transmission, numerical results show that the proposed relaying scheme is beneficial in achieving a comparable EE for low-rate delay-limited transmission.

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