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In a cognitive radio network (CRN), when the secondary users (SUs) are battery-powered devices, the concept of energy-efficient design is very important. In this paper, we propose an energy utility function by formulating the achievable data rate of a cooperative CRN in terms of the energy consumption by the CRN. The maximization of the energy utility function is obtained by jointly designing the...
An improvement is introduced of the modified successive-cancellation (MSC) decoding for polar codes, in which local decoders at rate-other nodes are simplified. This improvement reduces the decoding latency and complexity of the MSC decoding with no sacrifice in error performance. Furthermore, in our method, the decoding latency decreases rapidly with increasing signal-to-noise ratio. Significant...
Oil pipeline could be clogged by congealed oil products, due to low temperature. Thus, the distinct pressure difference around the plugged pipe section can be used to detect pipeline clogging, and the decompression wave of water hammer is put forward to identify plugged position of oil pipeline. The detailed theory is given below: when the pipeline is completely plugged, increase the pressure of pipeline,...
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