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Energy-efficient node placement is one of the main design issues for linear structure wireless sensor networks. Two types of node placement schemes studied in the paper are to maximize the network lifetime and to balance the network reload. For a given number of nodes, study the optimal spacing; for a given node spacing, study the optimal density of nodes. Simulation shows, two types of node placement...
This paper presents a new code distribution protocol based on parallel diffusion mechanism, PDM. It is targeted to address the problem of relatively low efficiency and high energy consumption in over-the-air re-programming (OTAP) for wireless sensor networks (WSNs). In PDM, the forwarding nodes are determined by the distances between adjacent nodes, and the transmission power can be adjusted dynamically...
Interesting and important optimization problems arise in systems that are simultaneously very large and very small, for example, very large networks of very small sensors. Regarding energy and information, smaller nodes carry less onboard energy than larger nodes, and they are worse antennas for communication at longer wavelength, i.e., lower energy per photon, so they have smaller total information...
We compare the single-channel transmission performance of 5 different modulation formats (NRZ, RZ, CSRZ, RZ-DPSK and CSRZ-DPSK) over a long haul network with optical add/drop multiplexers at varying node spacing.
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