Impact of Processing Energy on the Capacity of Wireless Channels
Impact of Processing Energy on the Capacity of Wireless Channels
复制标题
处理能量对无线信道容量的影响
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Pamela Youssef
中科院分区：
文献类型：
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作者：
Pamela Youssef
由于移动终端的电池寿命有限，能量分配是移动无线网络中的一个重要问题。本文从信息论的角度对这一问题进行了研究。传统的信息论能量约束只考虑用于传输目的的能量。我们通过显式地考虑当发射机处于开启状态时运行的传输以外的进程所消耗的能量来研究最优传输策略。我们把这种能量称为“加工能量”。在这些新的约束条件下，我们推导了加性高斯白噪声(AWGN)信道的容量。我们证明，与只考虑传输能量的情况不同，达到容量可能需要间歇性或“突发性”传输。特别地，我们证明了在低信噪比条件下，当处理能量大于发射机可用总能量的一半时，突发是最优的。
Energy eciency is an important issue in mobile wireless networks, since the battery life of mobile terminals is limited. In this paper, we address this issue from the information theoretic point of view. Traditional information theoretic energy constraints consider only the energy used for transmission purposes. We study optimal transmission strategies by explicitly taking into account the energy expended by processes other than transmission, that run when the transmitter is in the ‘on’ state. We term this energy by ‘processing energy’. Under these new constraints, we derive the capacity of an Additive White Gaussian Noise (AWGN) channel. We prove that, unlike the case where only transmission energy is taken into account, achieving capacity may require intermittent, or ‘bursty’, transmission. In particular, we show that in the low SNR regime, burstiness is optimal when the processing energy is greater than half the square of the total energy available to the transmitter.