Thesis

Multimedia services over wireless networks using OFDM

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Awarding institution
  • University of Strathclyde
Date of award
  • 2013
Thesis identifier
  • T13596
Qualification Level
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Department, School or Faculty
Abstract
  • This Thesis presents Multimedia systems based on Orthogonal Frequency Division Multiplexing (OFDM) multi carrier modulation system (MCM) architecture and signal processing techniques including discrete fractional Fourier transform (DFrFT), discrete fractional Cosine transform (DFrCT), and equalisation algorithms to mitigate the doubly dispersive channel effect on the OFDM communication systems. Equalisation algorithms are implemented for both the OFDM and the DFrFT orthogonal chirp division multiplexing (OCDM) systems. Mathematical formulae for the equalisation problem in doubly dispersive channel scenario are derived. A multimode system using both the OFDM and the DFrFT-OCDM depending on the communication channel characteristics and the system performance are presented. New low complexity equalisers based on the LSMR iterative algorithm are developed. The performance of these new equalisers is shown to be comparable to conventional low complexity equalisers however they require less complexity. A good improvement in the MCM systems under doubly dispersive channels is gained using the DFrCT transformation as bases for the MCM system with the new low complexity equalisers. Finally, extension to the previous work in multi input multi output (MIMO) is proposed including multi input single output (MISO) Alamouti space time block codes (STBCs), the extended orthogonal STBC (EO-STBC) MISO systems and the MIMO systems with the using of equalisation to improve the overall system performance under doubly dispersive fading channels.
Resource Type
DOI
Date Created
  • 2013
Former identifier
  • 1002001

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