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The authors investigate fundamental characteristics of cooperative transmission in terms of power efficiency. To do this, they first propose an optimal power allocation method for wireless cooperative networks with Rayleigh fading. By introducing the concept of "Cooperative region", they then evaluate the average power efficiency which is defined as the ratio of total consumed transmit power with cooperation to that of direct transmission and show how the average performance depends upon the QoS requirement, path loss exponent, distance between source and destination and on node density.
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