Computer Science – Information Theory
Scientific paper
2009-12-04
Computer Science
Information Theory
submitted to IEEE Transactions on Wireless Communications (25 pages)
Scientific paper
This paper presents the first in-depth analysis on the energy efficiency of LT codes with Non Coherent M-ary Frequency Shift Keying (NC-MFSK), known as green modulation [1], in a proactive Wireless Sensor Network (WSN) over Rayleigh flat-fading channels with path-loss. We describe the proactive system model according to a pre-determined time-based process utilized in practical sensor nodes. The present analysis is based on realistic parameters including the effect of channel bandwidth used in the IEEE 802.15.4 standard, and the active mode duration. A comprehensive analysis, supported by some simulation studies on the probability mass function of the LT code rate and coding gain, shows that among uncoded NC-MFSK and various classical channel coding schemes, the optimized LT coded NC-MFSK is the most energy-efficient scheme for distance $d$ greater than the pre-determined threshold level $d_T$, where the optimization is performed over coding and modulation parameters. In addition, although uncoded NC-MFSK outperforms coded schemes for $d < d_T$, the energy gap between LT coded and uncoded NC-MFSK is negligible for $d < d_T$ compared to the other coded schemes. These results come from the flexibility of the LT code to adjust its rate to suit instantaneous channel conditions, and suggest that LT codes are beneficial in practical low-power WSNs with dynamic position sensor nodes.
Abouei Jamshid
Brown Jacqueline D.
Pasupathy Subbarayan
Plataniotis Konstantinos N.
No associations
LandOfFree
On the Energy Efficiency of LT Codes in Proactive Wireless Sensor Networks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the Energy Efficiency of LT Codes in Proactive Wireless Sensor Networks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Energy Efficiency of LT Codes in Proactive Wireless Sensor Networks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-420043