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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/2696

Title: The effect of fading, channel inversion, and threshold scheduling on ad hoc networks
Authors: Weber, Steven
Andrews, Jeffrey G.
Jindal, Nihar
Keywords: Ad Hoc Networks;Channel Inversion;Fading;Threshold Scheduling;Transmission Capacity (TC)
Issue Date: Nov-2007
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: IEEE Transactions on Information Theory, 53(11): pp. 4127-4149.
Abstract: This paper addresses three issues in the field of ad hoc network capacity: the impact of i) channel fading, ii) channel inversion power control, and iii) threshold–based scheduling on capacity. Channel inversion and threshold scheduling may be viewed as simple ways to exploit channel state information (CSI) without requiring cooperation across transmitters.We use the transmission capacity (TC) as our metric, defined as the maximum spatial intensity of successful simultaneous transmissions subject to a constraint on the outage probability (OP). By assuming the nodes are located on the infinite plane according to a Poisson process, we are able to employ tools from stochastic geometry to obtain asymptotically tight bounds on the distribution of the signal-to-interference (SIR) level, yielding in turn tight bounds on the OP (relative to a given SIR threshold) and the TC. We demonstrate that in the absence of CSI, fading can significantly reduce the TC and somewhat surprisingly, channel inversion only makes matters worse. We develop a threshold-based transmission rule where transmitters are active only if the channel to their receiver is acceptably strong, obtain expressions for the optimal threshold, and show that this simple, fully distributed scheme can significantly reduce the effect of fading.
URI: http://dx.doi.org/10.1109/TIT.2007.907482
Appears in Collections:Faculty Research and Publications (ECE)

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