On the capacity improvement of ad hoc wireless networks using directional antennas

Abstract

The capacity of ad hoc wireless networks is constrained by the interference between concurrent transmissions from neighboring nodes. Gupta and Kumar have shown that the capacity of an ad hoc network does not scale well with the increasing number of nodes in the system when using omnidirectional antennas [6]. We investigate the capacity of ad hoc wireless networks using directional antennas. In this work, we consider arbitrary networks and random networks where nodes are assumed to be static.In arbitrary networks, due to the reduction of the interfer-Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee.

Sustainable simultaneous communications in ad-hoc networks using smart antenna systems

“…An interesting performance analysis of a directional MAC protocol using realistic antenna radiation patterns is proposed in [20], while, in [21], the same authors extend the conclusions of [17] to the smart antenna case. A further extension of [17] is proposed in [22] in order to include directional transmissions and receptions. A realistic analysis for the directional antenna case is described in [23], where the authors propose a cross-layer approach accounting for path-loss, shadowing and Rayleigh fading.…”

“…From the theoretical point of view, some papers have been proposed to evaluate the capacity of wireless networks [17][18][19][20][21][22][23]. In all these studies the characteristics of the spatial domain, such as the spatial channel model, are not explored completely.…”

Exact and Approximation Algorithms for Geometric and Capacitated Set Cover Problems

“…The use of directional antennas in cellular and wireless communication networks steadily grows [2,[16][17][18]. Although such antennas can only transmit along a narrow beam in a particular direction they have a number of advantages over the standard ones.…”

“…Although such antennas can only transmit along a narrow beam in a particular direction they have a number of advantages over the standard ones. Thus, they allow for an additional independent communication between the nodes in parallel [17], they also attain higher throughput, lower interference, and better energy-efficiency [2,16,18].…”

How is the capacity of ad hoc networks improved with directional antennas?

“…They also show that under some condition on the radius of each transmission, the maximum stable throughput could achieve linear in the number of nodes. This paper builds on the work described in [15] by giving a more complete analysis, extensive discussions on the achieveability of the capacity bound, and simulation results for validation. In this paper we introduce an interference model for antennas to analyze the capacity improvement on using directional antennas.…”