Source fidelity over a two-hop fading channel

Konstantinos E. Zachariadis*, Michael L. Honig, Aggelos K. Katsaggelos

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

6 Scopus citations


This paper1 studies the transmission of a continuous source over a two-hop fading channel. The source data traverses at least one intermediate node in order to reach the destination node. We assume a Gaussian source with Rayleigh fading links, and model the effect of each link through its outage capacity. We start with a single link, and optimize the transmission rate to minimize the received distortion. This minimum distortion is characterized as a function of transmission time, average channel gain, and transmitted power. We then consider a two-hop channel and optimize the transmission rates and transmission times over the two links. Two cases are compared: (i) The relay is allowed to optimize the transmission rate over the second link; and (ii) The relay retransmits the received bits over the second link at the same rate. Numerical examples show that both types of relays perform similarly over a wide parameter range of interest We characterize the minimum achievable distortion in each case when the ratio between channel gains becomes large, and show that the former (smart) relay gives a performance gain of at most three dB.

Original languageEnglish (US)
Number of pages6
StatePublished - 2004
EventOtLCOM 2004 - 2004 IEEE Military Communications Conference - Monterey, CA, United States
Duration: Oct 31 2004Nov 3 2004


OtherOtLCOM 2004 - 2004 IEEE Military Communications Conference
Country/TerritoryUnited States
CityMonterey, CA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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