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Title:Broadband Fading Channels: Signal Burstiness and Capacity
Author(s):Subramanian, Vijay Gautam
Doctoral Committee Chair(s):Hajek, Bruce
Department / Program:Electrical Engineering
Discipline:Electrical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Electronics and Electrical
Abstract:The general wide-sense stationary and uncorrelated scattering (WSSUS) fading channel has a similar behavior in that the capacity per unit energy equals the capacity per unit energy of the AWGN channel with the same signal-to-noise ratio. The fourth-moment cost is generalized to a fourth-order functional called fourthegy which depends on the square of the signal ambiguity function. The capacity per unit fourthegy for WSSUS channels is identified and is finite and nonzero. It follows that signals with small values of fourthegy per unit energy are able to communicate only a small number of bits per unit energy. It shown in this thesis that for wideband fading channels the nonbursty direct-sequence spread spectrum signals have small values of fourthegy per unit energy; therefore, such signals can only achieve small rates of reliable information transfer. This result holds in general for diffuse WSSUS fading channels as well as specular WSSUS fading channels with many multipath components. The accompanying reliability function per unit energy and reliability function per unit fourthegy are also derived.
Issue Date:1999
Description:90 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.
Other Identifier(s):(MiAaPQ)AAI9953150
Date Available in IDEALS:2015-09-25
Date Deposited:1999

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