| 1. |
- Farias, Fabricio, et al.
(författare)
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Cost- and energy-efficient backhaul options for heterogeneous mobile network deployments
- 2016
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Ingår i: Photonic network communications. - : AMER INST PHYSICS. - 1387-974X .- 1572-8188. ; 32:3, s. 422-437
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Tidskriftsartikel (refereegranskat)abstract
- Heterogeneous networks (HetNets) have the potential to cater for the capacity requirements of mobile broadband services at reduced cost and energy consumption levels. One key aspect in HetNets is the role of the backhaul. More specifically, it is crucial for a mobile operator to understand the impact of specific technological and architectural upgrades in the mobile backhaul network on the capital and operational expenditure (i.e., CAPEX and OPEX). This paper proposes a comprehensive methodology that can be used to analyze the total cost of ownership of a number of backhaul options based on fiber, microwave, and copper technologies. The study considers both a Greenfield and a Brownfield scenario and takes into account the mobile broadband capacity requirements for the time period between years 2015 and 2025. From the results presented in the paper it can be concluded that even though microwave and fiber will be predominately used in the future, the possible migration paths leading to such fiber- and microwave-based backhaul scenarios might be different, depending upon factors such as spectrum and license costs, time to deployment, availability of equipment, and required quality of service levels.
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| 2. |
- Fiorani, Matteo, et al.
(författare)
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On the design of 5G transport networks
- 2015
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Ingår i: Photonic network communications. - : Springer-Verlag New York. - 1387-974X .- 1572-8188. ; 30:3, s. 403-415
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Tidskriftsartikel (refereegranskat)abstract
- Future 5G systems will pave the way to a completely new societal paradigm where access to information will be available anywhere, anytime, and to anyone or anything. Most of the ongoing research and debate around 5G systems are focusing on the radio network segment (e.g., how to offer high peak-rates per subscriber, and how to handle a very large number of simultaneously connected devices without compromising on coverage, outage probability, and latency). On the other hand, understanding the impact that 5G systems will have on the transport network (i.e., the segment in charge of the backhaul of radio base stations and/or the fronthaul of remote radio units) is also very important. This paper provides an analysis of the key architectural challenges for the design of a flexible 5G transport infrastructure able to adapt in a cost-efficient way to the plethora of requirements coming from the large number of envisioned future 5G services.
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| 3. |
- Leong, Miu Yoong, et al.
(författare)
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Low-complexity BCH codes with optimized interleavers for DQPSK systems with laser phase noise
- 2017
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Ingår i: Photonic network communications. - : Springer Science and Business Media LLC. - 1387-974X .- 1572-8188. ; 33:3, s. 328-333
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Tidskriftsartikel (refereegranskat)abstract
- The presence of high phase noise in addition to additive white Gaussian noise in coherent optical systems affects the performance of forward error correction (FEC) schemes. In this paper, we propose a simple scheme for such systems, using block interleavers and binary Bose-Chaudhuri-Hocquenghem (BCH) codes. The block interleavers are specifically optimized for differential quadrature phase shift keying modulation. We propose a method for selecting BCH codes that, together with the interleavers, achieve a target post-FEC bit error rate (BER). This combination of interleavers and BCH codes has very low implementation complexity. In addition, our approach is straightforward, requiring only short pre-FEC simulations to parameterize a model, based on which we select codes analytically. We aim to correct a pre-FEC BER of around . We evaluate the accuracy of our approach using numerical simulations. For a target post-FEC BER of , codes selected using our method result in BERs around 3 target and achieve the target with around 0.2 dB extra signal-to-noise ratio.
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| 4. |
- Monti, Paolo, et al.
(författare)
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Special issue based on selected ONDM 2014 papers
- 2015
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Ingår i: Photonic network communications. - : Springer Science and Business Media LLC. - 1387-974X .- 1572-8188. ; 29:3, s. 227-229
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Monti, Paolo, et al.
(författare)
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Special issue on energy-efficient optical networks
- 2015
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Ingår i: Photonic network communications. - : Springer Science and Business Media LLC. - 1387-974X .- 1572-8188. ; 30:1, s. 1-3
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 6. |
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| 7. |
- Ruiz, Marc, et al.
(författare)
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Column Generation Algorithm for RSA Problems in Flexgrid Optical Networks
- 2013
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Ingår i: Photonic Network Communications. - : Springer Science and Business Media LLC. - 1387-974X .- 1572-8188. ; 26:2-3, s. 53-64
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Tidskriftsartikel (refereegranskat)abstract
- Finding optimal routes and spectrum allocation in flexgrid optical networks, known as the RSA problem, is an important design problem in transport communication networks. The problem is NP -hard, and its intractability becomes profound when network instances with several tens of nodes and several hundreds of demands are to be solved to optimum. In order to deal with such instances, large-scale optimization methods need to be considered. In this work, we present a column (more precisely, path) generation-based method for the RSA problem. The method is capable of finding reasonable sets of lightpaths, avoiding large sets of precomputed paths, and leading to high-quality solutions. Numerical results illustrating effectiveness of the proposed method for obtaining solutions for large RSA problem instances are presented.
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