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WLC13-3: A Study of Tradeoff between Energy Efficiency and Control Complexity for CDMA Wireless Sensor Networks

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2 Author(s)
Tao Shu ; Dept. of Electr. & Comput. Eng., Univ. of Arizona, Tucson, AZ ; Marwan Krunz

For CDMA-based WSNs, we quantitatively investigate and compare the optimal energy efficiencies and control complexities for three different power/time control (PTC) schemes: PTC with independent transmission power and time (PTC-IPT), PTC with unified transmission time (PTC-UT), and PTC with unified spreading gain (PTC-USG). These schemes provide different degrees of control and require different amounts of overhead. Under each scheme, the minimization of system's energy consumption is formulated as a non-convex optimization problem. The optimal transmission power and time are derived analytically through a variable-decoupling approach. The analytical nature of our results makes it feasible to compare the performance in closed form. Numerical examples and simulations are provided to validate our analysis.

Published in:

IEEE Globecom 2006

Date of Conference:

Nov. 27 2006-Dec. 1 2006