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In multi-user cooperative diversity systems, energy-efficient optimal power allocation (OPA) is an essential problem. However, most of the existing works only focus on optimizing the overall system energy efficiency (EE), rather than the individual EE for each user. In this paper, we investigate the OPA in multi-user amplify-and-forward cooperative systems aiming at maximizing the EE for each individual...
In this paper, a multi-slot spectrum sensing and transfer scheme inmultichannel CR is proposed by dividing the sensing stage into several time slots that are allocated to the subchannels for spectrum sensing. We formulate an optimization problem that maximizes the SU's aggregate throughput by jointly allocating the optimal number of sensing time slots and transfer power to each subchannel. The simulation...
Network virtualization is regarded as a promising solution to the revolution of the current Internet. With virtualization, disruptive technologies can be easily deployed over the logic (service) network and transparently mapped to the physical network via the network embedding process. In this work, we address the survivability issue in the virtualization context via resolving the survivable network...
To overcome the inefficiency of the rigid frequency allocation in traditional wavelength division multiplexing (WDM) networks, the idea of slicing the optical spectrum for elastic and flexible bandwidth allocation has attracted significant interest recently. The resulting network, namely, the spectrum-sliced elastic optical path (SLICE) network, can facilitate both the super-wavelength and sub-wavelength...
Recently, the OFDM-based Spectrum-sliced Elastic Optical Path (SLICE) network attracts significant interests due to its elastic band-width allocation. The OFDM technology, on one hand, enables both sub-wavelength and super-wavelength traffic accommodation by allocating appropriate number of sub-carriers. On the other hand, it can provide high signal quality by overcoming various impairments. In SLICE...
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