Investigation and Analysis of CDMA and OFDM Based Performance Enhancement Techniques in Wireless Communication Systems

  • Ahmed El Kalagy

Student thesis: Phd


This thesis introduces performance analysis on the effect of using orthogonal polyphase spreading sequences in the uplink scenario of Code Division Multiple Access (CDMA) systems, with the use of two novel dynamic code allocation algorithms to exploit the cross-correlation properties of the spreading sequences. The analysis is also extended to the cooperative communication world, where a cooperative uplink technique is presented that builds on the results and conclusions achieved in the conventional uplink scenario. Theoretical analysis and simulation results are given to highlight the performance gains achieved using the proposed techniques.As Multiple-Input Multiple-Output (MIMO) systems have been increasingly studied and researched in the recent literature to accommodate for the high demand of current and future generations of wireless communications, this thesis follows the same pattern and investigates a new MIMO transmission technique, namely, Spatial Modulation. The thesis then proposes new novel Spatial Modulation enhancement techniques that focus on utilising more of the available system resources for further performance improvements.
Date of Award1 Aug 2012
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorEmad Alsusa (Supervisor)


  • CDMA
  • Polyphase
  • OFDM
  • Code Allocation
  • Spatial Modulation

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