NDLI: On Energy Efficient Communications over Rayleigh Fading Channel with Delivery Rate and Delay Constraints in Wireless Sensor Networks

Content Provider	IEEE Xplore Digital Library
Author	Xiao-Hui Lin Yu-Kwong Kwok
Copyright Year	2007
Description	Author affiliation: Shenzhen Univ., Shenzhen (Xiao-Hui Lin)
Abstract	There is a plethora of recent research on high performance wireless communications using a cross-layer approach in that adaptive modulation and coding (AMC) schemes at wireless physical layer are used for combating time varying channel fading and enhance link throughput. However, in a wireless sensor network, transmitting packets over deep fading channel can incur excessive energy consumption due to the usage of stronger forwarding error code (FEC) or more robust modulation mode. To avoid such energy inefficient transmission, a straightforward approach is to temporarily buffer packets when the channel is in deep fading, until the channel quality recovers. Unfortunately, packet buffering may lead to communication latency and buffer overflow, which, in turn, can result in severe degradation in communication performance. Specifically, to improve the buffering approach, we need to address two challenging issues: (1) how long should we buffer the packets?, and (2) how to choose the optimum channel transmission threshold above which to transmit the buffered packets? In this paper, by using discrete-time queuing model, we analyze the effects of Rayleigh fading over AMC- based communications in a wireless sensor network. We then analytically derive the packet delivery rate and average delay. Guided by these numerical results, we can determine the most energy-efficient operation modes under different transmission environments. Extensive simulation results on NS-2 have validated the analytical results, and indicates that under these modes, we can achieve as much as 40% reduction in energy dissipation.
Starting Page	70
Ending Page	70
File Size	221702
Page Count	1
File Format	PDF
ISBN	0769529348
ISSN	15302016
DOI	10.1109/ICPPW.2007.62
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-10
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Energy efficiency Fading Wireless sensor networks Modulation coding Rayleigh channels Delay Wireless communication Physical layer Throughput Energy consumption link adaptation wireless sensor networks cross-layer design Rayleigh fading
Content Type	Text
Resource Type	Article

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