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In this paper, the energy-efficient massive MIMO design problem is investigated in both single-cell and multi-cell scenarios with the aim of selecting appropriate parameters to maximize the overall system energy utilization. To this end, a more realistic parameter selection model is established by considering the channel estimation error and pilot contamination (PC). In the proposed model, we not...
In this work, we present an optimal power allocation scheme dedicated for variable-hop cooperative relays in cognitive networks, which consists of Secondary users (SUs) operating in Amplify-and-Forward (AF) mode, with a Primary user (PU) receiver nearby. In order to assure the quality of service (QoS) for PU, transmit power of cognitive radio (CR) nodes must be tightly controlled which leads to narrow...
A proof-of-concept prototype of optical sub-wavelength switching fabric is demonstrated. The prototype supports petabit switching capacity with agile service granularity and low power consumption.
In this paper, we investigate the power saving issue in cognitive radio (CR) multi-hop relay network. Due to the dynamic property of the wireless channel, the quality of service (QoS) guarantee for multi-hop transmission is quite challenging. To deal with these problems, automatic repeat-request (ARQ) protocol in an end-to-end manner is incorporated. For multi-hop transmission evaluation purpose,...
In this paper, the authors try to deal with the problem that on arrival of the user's call request, how to ensure the user is accessed by the most appropriate network. And different solution might be given depending on the definition of "most appropriate", which they consider herein as the user's QoS requirement and the power efficiency of the transmission.
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