Abstract
Energy conservation is a critical problem in recently-emerging wireless sensor networks (WSNs). Pulse position modulation (PPM), as an exploring-worthy modulation format for energy efficiency, is tailored for WSNs into two schemes, mono-mode PPM and multi-mode PPM, in this paper. Resorting to an idealized system model and a practical system model, which combine the power consumptions in transmission and reception modules of nodes with the idealized and realistic battery characteristics, the battery energy efficiencies of mono-mode PPM and multi-mode PPM are evaluated and compared. To minimize the battery energy consumption (BEC), these schemes are further optimized in terms of constellation size M for a link in path-loss channels. Our analytical and numerical results show that considerable energy can be saved by multi-mode PPM; and the optimization performances of these schemes are noticeable at various communication distances though their optimization properties are different.
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Supported by the National Natural Science Foundation of China (Grant Nos. 60642007 and 10374051) and the Scientific Fundation of Guangxi Education Department of China (Grant No. [2002]316)
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Tang, Q., Yang, L., Qin, T. et al. Energy-saving PPM schemes for WSNs. Sci. China Ser. F-Inf. Sci. 51, 571–585 (2008). https://doi.org/10.1007/PL00022209
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DOI: https://doi.org/10.1007/PL00022209