A signal combining technique based on channel shortening for cooperative sensor networks

Syed Imtiaz Hussain, Mohamed-Slim Alouini, Mazen Omar Hasna

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The cooperative relaying process needs proper coordination among the communicating and the relaying nodes. This coordination and the required capabilities may not be available in some wireless systems, e.g. wireless sensor networks where the nodes are equipped with very basic communication hardware. In this paper, we consider a scenario where the source node transmits its signal to the destination through multiple relays in an uncoordinated fashion. The destination can capture the multiple copies of the transmitted signal through a Rake receiver. We analyze a situation where the number of Rake fingers N is less than that of the relaying nodes L. In this case, the receiver can combine N strongest signals out of L. The remaining signals will be lost and act as interference to the desired signal components. To tackle this problem, we develop a novel signal combining technique based on channel shortening. This technique proposes a processing block before the Rake reception which compresses the energy of L signal components over N branches while keeping the noise level at its minimum. The proposed scheme saves the system resources and makes the received signal compatible to the available hardware. Simulation results show that it outperforms the selection combining scheme. ©2010 IEEE.
Original languageEnglish (US)
Title of host publication2010 IEEE International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Print)9781424472659
DOIs
StatePublished - Jun 2010

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