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Wireless Ad Hoc Networks: Strategies and Scaling Laws for the Fixed SNR Regime

机译:无线Ad Hoc网络:固定SNR体制的策略和缩放律

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摘要

This paper deals with throughput scaling laws for random ad hoc wireless networks in a rich scattering environment. We develop schemes to optimize the ratio lambda(n) of achievable network sum capacity to the sum of the point-to-point capacities of source-destinations (S-D) pairs operating in isolation. Our focus in this paper is on fixed signal-to-noise ratio (SNR) networks, i.e., networks where the worst case SNR over the S-D pairs is fixed independent of n. For such fixed SNR networks, which include fixed area networks as a special case, we show that collaborative strategies yield a scaling law of lambda(n)=Omega(11/3) in contrast to multihop strategies which yield a scaling law of lambda(n)=Theta(1/radicn). While networks where worst case SNR goes to zero do not preclude the possibility of collaboration, multihop strategies achieve optimal throughput. The plausible reason is that the gains due to collaboration cannot offset the effect of vanishing receive SNR. This suggests that for fixed SNR networks, a network designer should look for network protocols that exploit collaboration
机译:本文讨论了在分散环境中随机ad hoc无线网络的吞吐量缩放定律。我们开发了一些方案,以优化可实现的网络总容量与独立运行的源目的地(S-D)对的点对点容量之和的比率lambda(n)。本文的重点是固定信噪比(SNR)网络,即在S-D对上最坏情况下SNR与n无关地固定的网络。对于这样的固定SNR网络(其中包括固定区域网络作为一种特例),我们表明与多跳策略产生的缩放定律相比,协作策略产生的缩放定律为lambda(n)= Omega(1 / n1 / 3)。 lambda(n)= Theta(1 / radicn)。尽管在最坏情况下SNR变为零的网络并不排除协作的可能性,但多跳策略可实现最佳吞吐量。可能的原因是,协作带来的增益无法抵消接收信噪比(SNR)消失的影响。这表明对于固定SNR网络,网络设计人员应寻找可利用协作的网络协议

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