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UBC Theses and Dissertations

Faster-than-Nyquist system design for next generation fixed transmission networks Jana, Mrinmoy


Monumental growth of traffic load in the communication networks has heavily strained the existing fixed transmission network infrastructure. Such enormous surge of traffic warrants enabling higher data rates in these networks, where predominantly optical fibers and microwave radio links are deployed. With bandwidth becoming an expensive resource, and owing to the practical constraints of the electronic components, employing high baud rates alone may be insufficient to accomplish such high throughputs in these optical fiber communication (OFC) and microwave communication (MWC) systems. Hence, increasing the spectral efficiency (SE) is a key requirement for these networks. For this pursuit, this thesis investigates the application of Faster-than-Nyquist (FTN) signaling in fixed transmission networks, with an objective to achieve high SE and data rates. FTN is an enabling technology that offers SE improvements by allowing controlled overlap of the transmitted symbols in time or frequency or both. OFC and MWC systems are suitable platforms for the introduction of FTN signaling, since FTN can moderate the need for higher order modulation formats, which are sensitive to phase noise and fiber nonlinearity. In this thesis, we combine the concept of FTN signaling with other conventional throughput increasing techniques, such as polarization multiplexing and multicarrier transmission, to further the data rate improvements. However, FTN introduces inter-symbol-interference and/or inter-carrier interference. Moreover, integrating FTN signaling with polarization multiplexing and multicarrier transmission complicates the realistic implementation. OFC and MWC systems also pose additional practical challenges stemming from the specific communication channel environments and the transceiver components. If not successfully mitigated, all of these impairments and non-idealities significantly deteriorate the performance of the communication links. In this thesis, we address each of these unique challenges through suitable mitigation algorithms, to facilitate an efficient FTN transmission. For this, we present sophisticated system designs equipped with powerful digital signal processing tools. We numerically evaluate the performance of our proposed methods by simulating realistic OFC and MWC systems. The simulation results indicate that our proposed spectrally efficient designs offer significant performance advantages over existing competitive schemes.

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