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  Hybrid OFDM transmission system for connected autonomous vehicles


   School of Computing, Engineering & the Built Environment

  Assoc Prof Petros Karadimas  Applications accepted all year round  Self-Funded PhD Students Only

About the Project

Orthogonal Frequency Division Multiplexing (OFDM) is a technique that exploits orthogonal carriers to transmit information and enhance received signal diversity and consequently increase received signal-to-noise ratio (SNR). In wireless mobile communications, carrier orthogonality is violated due to the inherent Doppler spread arisen by the temporal variability of the wireless channel. This effect causes degradation of received signal quality and becomes more evident in high mobility scenarios such as in connected autonomous vehicles (CAVs). However, the increased Doppler spread in CAVs provides an alternative signal diversity mechanism characterized as Doppler diversity. Starting from a very thorough literature review, the OFDM technique will be theoretically studied and analyzed to understand the important parameters affecting its performance in CAV scenarios. The PhD candidate should come up with a solution compensating the increased Doppler spread in such scenarios. The project will then investigate the implementation of a hybrid OFDM architecture by incorporating Doppler diversity in CAV scenarios. Both the hybrid and the standard OFDM architectures should be then implemented/simulated in an appropriate software tool (e.g., Matlab, Labview). A comparative study of both architectures will demonstrate the performance improvement (if any) of the hybrid against the standard OFDM architecture.

Academic qualifications 

A first-class honours degree, or a distinction at master level, or equivalent achievements ideally in Electrical/Electronic Engineering, or Mathematics. 

English language requirement 

If your first language is not English, comply with the University requirements for research degree programmes in terms of English language

Application process 

Prospective applicants are encouraged to contact the supervisor, Dr Petros Karadimas () to discuss the content of the project and the fit with their qualifications and skills before preparing an application. 

The application must include:  

Research project outline of 2 pages (list of references excluded). The outline may provide details about 

  • Background and motivation, explaining the importance of the project, should be supported also by relevant literature. You can also discuss the applications you expect for the project results. 
  • Research questions or 
  • Methodology: types of data to be used, approach to data collection, and data analysis methods. 
  • List of references 

The outline must be created solely by the applicant. Supervisors can only offer general discussions about the project idea without providing any additional support. 

  • Statement no longer than 1 page describing your motivations and fit with the project. 
  • Recent and complete curriculum vitae. The curriculum must include a declaration regarding the English language qualifications of the candidate. 
  • Supporting documents will have to be submitted by successful candidates. 
  • Two academic references (but if you have been out of education for more than three years, you may submit one academic and one professional reference), on the form can be downloaded here

Applications can be submitted here.

Download a copy of the project details here

Engineering (12) Mathematics (25)

References

[1] A. Goldsmith, "Wireless communications," Cambridge university press, 2005.
[2] A. M. Sayeed and B. Aazhang, "Joint multipath-Doppler diversity in mobile wireless communications," IEEE Transactions on Communications, vol. 47, no. 1, pp. 123-132, Jan. 1999.
[3] Tiejun Wang, J. G. Proakis, E. Masry and J. R. Zeidler, "Performance degradation of OFDM systems due to Doppler spreading," IEEE Transactions on Wireless Communications, vol. 5, no. 6, pp. 1422-1432, June 2006.
[4] R. Hadani et al., "Orthogonal Time Frequency Space Modulation," 2017 IEEE Wireless Communications and Networking Conference (WCNC), 2017, pp. 1-6.
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