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Title: Mathematical modelling and signal and system design for spectrally efficient future wireless communications
Author: Ghannam, Hedaia
ISNI:       0000 0004 8507 5182
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2019
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This thesis addresses engineering studies and design of a multi-carrier signalling format known as spectrally efficient frequency division multiplexing (SEFDM), in which higher spectral efficiency compared to conventional orthogonal frequency division multiplexing (OFDM) is achieved by compressing the spacing between subcarriers below the orthogonality limit. Work reported in this thesis comprises: i) Critical revision of existing studies of multi-carrier modulation formats and techniques developed for improving the spectral efficiency, with special emphasis on SEFDM system. ii) Mathematical modelling of interference in SEFDM and its potential capacity advantages. iii) The introduction of powerful channel coding techniques to mitigate the effect of interference in SEFDM, and the design of successive interference cancellation method, with a special case for broadband and broadcasting applications (DVB-S2) being considered. iv) A novel channel estimation scheme is developed to enhance channel estimation accuracy and to reduce its complexity for SEFDM signals for 5G systems. v) An experimental demonstration of successful SEFDM signals transmission over the E-Band frequency range 81-86 GHz. The systems proposed are described in detail with numerical simulations of the newly proposed system models to compare their performance to conventional OFDM systems. It is shown that SEFDM with the aforementioned techniques can achieve significant spectral efficiency gains at the expense of moderate increase in receiver complexity or increase in the transmitted power level compared to OFDM. Overall, theoretical, simulation and experimental results show key advantages of SEFDM signals and systems over other signal formats, thus paving the way to practical inclusion of SEFDM in future wireless standards.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available