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Energy-efficient transmission and bit allocation schemes are investigated in multisource single-sink Wireless Sensor Networks (WSNs). For transmission over Additive White Gaussian Noise (AWGN) channels with path loss, this work shows that the overall energy consumption can be minimised if each sensor transmits with the minimum power and cooperates with others in Time-Division Multiple Access (TDMA) mode. From the efficient correlated source coding perspective, the Slepian - Wolf coding theorem is applied. Jointly considering the two aspects, the authors propose a closed form bit allocation scheme to minimise the overall energy consumption.
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