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Using a real wireless sensor network testbed, we have demonstrated and analyzed the performance of fixed and dynamic transmission-power-control algorithms. Several transmission power control algorithms have been proposed, but little empirical data is available. We test several popular algorithms on convergence and aggregation traffic patterns, which are commonly used in multi-hop wireless sensor networks for data collection. For the convergence traffic pattern, we have found that the dynamic transmission-power-control algorithm enabled a wireless sensor network to sustain the desired end-to-end throughput while consuming less energy than the fixed transmission-power-control algorithm.

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