In this paper, we present a model of visible light communication (VLC) systems which exploit light beams for downlink transmission. A calculation method is proposed for light beam configuration (LBC) which guarantees ...
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ISBN:
(纸本)9781509027118
In this paper, we present a model of visible light communication (VLC) systems which exploit light beams for downlink transmission. A calculation method is proposed for light beam configuration (LBC) which guarantees no blind areas in the whole VLC coverage while minimizing the number of light beams. As a major contribution in this paper, a light beam allocation algorithm (LBAA) is proposed which aims to eliminate interferences between inter VLC Access Points (inter-APs) by using information of incoming data queue length and co-channel interference (CCI) conditions to decide which VLC beams are used for transmitting data to appropriate user equipment (UEs). By deploying the proposed algorithm, CCI can be eliminated because noise-effected regions and noise-free regions can be separated. Performance of the novel LBAA is analyzed, evaluated and then compared with that of another light beam allocation method using the Round-Robin algorithm. Performance results show that there are significantly improvements in term of SINR, user throughput and packet delay parameters when deploying the proposed LBAA.
In order to enhance the network throughput for modern fiber optic networks, disruptive capacity-expanding technologies are emerging, such as spatial division multiplexing or adding L-band transmission, at the cost of ...
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A virtualization architecture is presented for deploying multitenant virtual networks on top of multi-technology optical networks. A multidomain network hypervisor (MNH) and a multidomain SDN orchestrator (MSO) are in...
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A virtualization architecture is presented for deploying multitenant virtual networks on top of multi-technology optical networks. A multidomain network hypervisor (MNH) and a multidomain SDN orchestrator (MSO) are introduced with this purpose. The MNH provides an abstract view of each virtual network and gives control of it to each independent customer SDN controller. The MNH is able to provide virtual networks across heterogeneous control domains (i.e., generalized multiprotocol label switching and OpenFlow) and transport technologies (i.e., optical packet switching and elastic optical networks). The MSO is responsible for providing the necessary end-to-end connectivity. We have designed, implemented, and experimentally evaluated the MNH and MSO in an international testbed across Spain, UK, Germany, and Japan.
In this paper, we propose two efficient and practical resource allocation algorithms to maximize the weighted sum-rate of coordinated multipoint (CoMP) transmission with joint processing in multiuser multiple-input mu...
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ISBN:
(纸本)9781479935130
In this paper, we propose two efficient and practical resource allocation algorithms to maximize the weighted sum-rate of coordinated multipoint (CoMP) transmission with joint processing in multiuser multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) systems subject to per-antenna power constraints. We first propose a continuous-rate algorithm that utilizes successive convex approximation (SCA) to dynamically allocate the transmit powers of multiple CoMP base stations (BSs) transmitting to multiple co-channel user terminals (UTs). Next, we propose a discrete-rate algorithm that takes the continuous-rate result as a starting point and redistributes the transmit powers to obtain a discrete solution. Simulation results are provided to benchmark our continuous-rate algorithm with two alternative approaches: iterative waterfilling (IWF), and zero-forcing beamforming (ZFB). Results show that SCA provides significant sum-rate improvements over IWF in medium to high interference scenarios, and outperforms ZFB in low to medium interference scenarios. Moreover, our proposed discrete rate algorithm produces a higher discrete sum-rate with much lower computational complexity compared to existing algorithms.
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