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arXiv 1704.04584cs.ITmath.IT
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能量收集接收机的功率优化性能

Performance of Energy Harvesting Receivers with Power Optimization

Zhengwei Ni, Mehul Motani

摘要:

通信系统中能量消耗建模的困难导致了能量收集(EH)系统的挑战,其中节点从其环境中获取能量。EH接收器必须收集足够的能量用于解调和解码。所需的能量取决于可以动态调整的因素,如码率和信噪比。我们考虑从环境源和发射机中获取能量的接收机,这意味着接收到的信号用于EH和信息解码。假设一个广义函数的能量消耗,我们最大限度地提高了解码的信息比特的总数,在平均和峰值功率的限制下,在发射机,通过仔细优化用于EH的功率,用于信息传输的功率,用于EH的时间分数,和码率。对于在单个块上的传输,我们发现存在最大化信息传输功率或最大化EH功率的问题参数是最优的。在一般情况下,最优解是两者的折衷。对于多块传输,我们给出了性能上界,并给出了实现这一界的充分必要条件。最后,我们给出了一些数值结果来说明我们的结果和分析。

英文摘要:

The difficulty of modeling energy consumption in communication systems leads to challenges in energy harvesting (EH) systems, in which nodes scavenge energy from their environment. An EH receiver must harvest enough energy for demodulating and decoding. The energy required depends upon factors, like code rate and signal-to-noise ratio, which can be adjusted dynamically. We consider a receiver which harvests energy from ambient sources and the transmitter, meaning the received signal is used for both EH and information decoding. Assuming a generalized function for energy consumption, we maximize the total number of information bits decoded, under both average and peak power constraints at the transmitter, by carefully optimizing the power used for EH, power used for information transmission, fraction of time for EH, and code rate. For transmission over a single block, we find there exist problem parameters for which either maximizing power for information transmission or maximizing power for EH is optimal. In the general case, the optimal solution is a tradeoff of the two. For transmission over multiple blocks, we give an upper bound on performance and give sufficient and necessary conditions to achieve this bound. Finally, we give some numerical results to illustrate our results and analysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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