Signaling with imperfect channel state information: A battery power efficiency comparison

Fengzhong Qu, Dongliang Duan, Liuqing Yang, Ananthram Swami

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

Abstract

Due to complexity considerations, pulse-hased modulations such as pulse position modulation (PPM) and on-off keying (OOK) are well suited for wireless sensor networks (WSNs) since they provide the possibility of carrier-less signaling and, more importantly, non-coherent reception bypassing channel estimation at the receiver. In this paper, we compare PPM and OOK in terms of their battery power efficiencies (BPE). using a nonlinear battery model, and under the same bandwidth efficiency and cutoff rate constraints. Cutoff rate is employed as our comparison criterion because it leads to a tractable analysis that is often impossible through direct evaluation of random coding exponent or capacity. In addition, cutoff rate gives a universal expression for both coherent and non-coherent detection by simply setting different channel state information (CSI) qualities. Our system model integrates typical WSN transmission and reception modules with realistic nonlinear battery models. Circuit power consumption. DC/DC converter efficiency and power amplifier efficiency are also taken into consideration. Our analytical results characterize the signal-to-noise ratio (SNR) - cutoff rate - CSI region where PPM (OOK) is more power efficient than OOK (PPM). We provide an interpretation in terms of transmission range and symbol set size. Numerical results verify the analysis.

Original languageEnglish (US)
Title of host publicationMilitary Communications Conference, MILCOM 2007
DOIs
StatePublished - 2007
Externally publishedYes
EventMilitary Communications Conference, MILCOM 2007 - Orlando, FL, United States
Duration: Oct 29 2007Oct 31 2007

Publication series

NameProceedings - IEEE Military Communications Conference MILCOM

Conference

ConferenceMilitary Communications Conference, MILCOM 2007
CountryUnited States
CityOrlando, FL
Period10/29/0710/31/07

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