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- Beygi, Lotfollah, 1977, et al.
(författare)
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Coded Modulation for Fiber-Optic Networks
- 2014
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Ingår i: IEEE Signal Processing Magazine. - 1558-0792 .- 1053-5888. ; 31
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Tidskriftsartikel (refereegranskat)abstract
- In this tutorial, we study the joint design of forward error correction and modulation for fiber-optic communications. To this end, we use an information-theoretic design framework to investigate coded modulation (CM) techniques for standard additive white Gaussian noise channels and fiber-optic channels. This design guideline helps us to provide a comprehensive overview of the CM schemes in the literature. Then, by invoking recent advances in optical channel modeling for non-dispersion-managed links, we discuss two- and four-dimensional CM schemes. Moreover, we discuss the electronic computational complexity and hardware constraints of CM schemes for optical communications. Finally, we address CM schemes with signal shaping and rate-adaptation capabilities to accommodate the data transmission scheme to optical links with different signal qualities.
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| 2. |
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| 3. |
- Beygi, Lotfollah, 1977, et al.
(författare)
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Rate-Adaptive Coded Modulation for Fiber-Optic Communications
- 2014
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Ingår i: Journal of Lightwave Technology. - 0733-8724 .- 1558-2213. ; 32:2, s. 333-343
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Tidskriftsartikel (refereegranskat)abstract
- Rate-adaptive optical transceivers can play an important role in exploiting the available resources in dynamic optical networks, in which different links yield different signal qualities. We study rate-adaptive joint coding and modulation, often called coded modulation (CM), addressing non-dispersion-managed (non-DM) links, exploiting recent advances in channel modeling of these links.We introduce a four-dimensional CM scheme, which shows a better tradeoff between digital signal processing complexity and transparent reach than existing methods. We construct a rate-adaptive CM scheme combining a single low-density parity-check code with a family of three signal constellations and using probabilistic signal shaping. We evaluate the performance of the proposed CM scheme for single-channel transmission through long-haul non-DM fiber-optic systems with electronic chromatic-dispersion compensation. The numerical results demonstrate improvement of spectralefficiency over a wide range of transparent reaches, an improvement over 1 dB compared to existing methods.
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