NDLI: DF versus AF: Energy consumption comparison for IEEE 802.15.4 networks

Content Provider	IEEE Xplore Digital Library
Author	Biswas, S. Chandra, A.
Copyright Year	2014
Description	Author affiliation: ECE Dept., Nat. Inst. of Technol., Durgapur, India (Biswas, S.; Chandra, A.)
Abstract	IEEE 802.15.4 refers to a standard meant for short range wireless sensor networks (WSNs). Recently, the standard has gained huge popularity due to its simplicity, scalability, and low power consumption. In this paper, we investigate the energy efficiency of relay assisted dual hop communication between two 802.15.4 compliant wireless nodes. Novel energy consumption models for both amplify-and-forward (AF) and decode-and-forward (DF) selective relaying protocols have been formulated and energy efficiency of these two protocols have been assessed by comparing the respective energy requirement per successful bit transmission. Small scale fading introduces outage during transmission over 802.15.4 links. The results show that although under moderate to high channel outage probability, DF relaying offers better energy efficiency than AF relays, when the outage is low, their performances become identical. Next, variation of energy consumption with data payload size is elaborated for both DF and AF relays. It was found that, under moderate outage, there exists an optimum value for the payload size where energy saving is maximum. For similar channel conditions, the optimum payload size is more for DF relays. When the outage value is very high energy consumption increases exponentially with payload size. The trend reverses when the outage is low.
Starting Page	1
Ending Page	7
File Size	1224177
Page Count	7
File Format	PDF
ISBN	9781479936359
DOI	10.1109/COMSNETS.2014.6734904
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-06
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fading Wireless sensor networks Energy consumption IEEE 802.15 Standards Frame outage Payload Length Decode-and-forward (DF) Amplify-and-forward (AF) IEEE 802.15.4 Instantaneous power scaling (IPS) Wireless relay Relays
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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