Fading Channels: InformationTheoretic and Communications Aspects

doi:10.1109/9780470544907.ch22

Cited by 250 publications

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Untitled

Vía

Santamarı́a

Pérez

et al. 2010

Wireless Communications

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SummaryThe integration of the Mobile Ad Hoc Networks (MANETs) into 4G systems will help to increase the networking flexibility and coverage of existing infrastructure networks. One of the crucial challenges is modifying existing reactive ad hoc routing protocols to support external routing operations. This paper contributes thorough protocol extensions for connecting DSR-based MANETs with the Internet (DSR-IE). DSR routing protocol is extended to effectively support External Route Discovery and External Route Maintenance functions. In particular, a novel External Route Discovery scheme, Comprehensive External Route Judgment, (CERJ) is proposed. Mobile IP is utilized to manage seamless data services. Finally, OPNET simulation models are developed to demonstrate the implementability and effectiveness of the proposed schemes.

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Untitled

Vía

Santamarı́a

Pérez

et al. 2010

Wireless Communications

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Information Theory of Underspread WSSUS Channels

Durisi

Bölcskei

Schuster

et al. 2011

Wireless Communications Over Rapidly Time-Varying Channels

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In this chapter, we are interested in the ultimate limit on the rate of reliable communication over Rayleigh-fading channels that satisfy the wide-sense stationary (WSS) and uncorrelated scattering (US) assumptions and are underspread [Bel63,Ken69]. Therefore, the natural setting is an information-theoretic one, and the performance metric is channel capacity [CT91, Gal68].The family of Rayleigh-fading underspread WSSUS channels (reviewed in Chapter 1) constitutes a good model for real-world wireless channels: their stochastic properties, like amplitude and phase distributions match channel measurement results [SB07,Sch09]. The Rayleigh-fading and the WSSUS assumptions imply that the stochastic properties of the channel are fully described by a two-dimensional power spectral density (PSD) function, often referred to as scattering function [Bel63]. The underspread assumption implies that the scattering function is highly concentrated in the delay-Doppler plane.To analyze wireless channels with information-theoretic tools, a system model, not just a channel model, needs to be specified. A system model is more comprehensive than a channel model because it defines, among other parameters, the transmit-power constraints and the channel knowledge available at the transmitter and the receiver. The choice of a 1

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