Layered transmission of signals over power-constrained wireless channels
ICIP '95 Proceedings of the 1995 International Conference on Image Processing (Vol. 3)-Volume 3 - Volume 3
Wireless image sensor networks: event acquisition in attack-prone and uncertain environments
Multidimensional Systems and Signal Processing
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Scalable encoded information, as in the JPEG 2000 standard, results in files, which can be truncated at an arbitrary point and decoded. This work introduces a tractable, yet flexible model appropriate for resource management involving scalably encoded information. At its core is a function yielding a measure of "quality" of the decoded information as a function of the number of bits chosen for decoding. It is assumed that all that is known about this function is that its graph yields an "S-curve". An energy-efficient policy for the transmission over a wireless network of scalably- encoded images is sought. Two variables are jointly optimized: transmission power, and the number of bits of each file to be decoded ("coding rate"). The single-user case is fully analyzed, and a closed-form solution given, which can be clearly identified, graphically. The analysis indicates that both variables can be "decoupled", and their optimal values found independently of each other.