关键词: 决策融合, 莱斯衰落, 三级量化

Abstract:

Considering the problem of event detection in censoring sensor networks, an optimal fusion rule based on the three-level quantization was derived for the mode of Rician fading channels. However, the optimal fusion rule requires instantaneous channel state information which may be too costly for resource-constrained sensor networks. A sub-optimal alternative with the knowledge of channel statistics was proposed. To further simplify the fusion rules, three simple approximations were also presented. Simulations show that, by the proposed censoring strategy, the goal of energy saving and performance improvement can be achieved. In addition, the performance analysis and comparision between different fusion rules show that in resource-constrained sensor networks, a tradeoff between detection performance and the requirement on system resource should be considered when choosing the fusion rules.

Key words: decision fusion, Rician fading, three-level quantization