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Title: Enhanced Channel Estimation Techniques for Pilot Assisted OFDMA Systems
Author: Liu, Hongju
Awarding Body: University of Surrey
Current Institution: University of Surrey
Date of Award: 2008
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Generalised orthogonal frequency-division multiple-access (OFDMA) has been one of key air-interfaces for next-generation mobile communication systems. Allocated pilot symbols play a key iole for the channel estimation and prediction that is essential for the design of OFDMA transceivers. In the past years, pilot...;assisted channel estimation (PACE) has received extensive investigations particularly for the downlink. Many classical PACE schemes have been developed together with the pilot optimisation that minimises the noise-induced channel estimation error. However, in uplink communicatiOllS, where polynomial interpolation schemes are usually employed, the interpolation error induced by the mismatch between interpolation models and actual channels often exists besides the noise-induced error. Conventional PACE approaches assume that the interpolation-error can be ignored. However, throughout the investigation of this thesis, it was found the interpolation error could not be compensated by increasing signal-to-noise-ratio (SNR), meanwhile it could be the dominative factor to affect the PACE performance in high-SNR or high-mobility environments. Therefore, investigation for uplink PACE by considering the interpolation error becomes an interesting issue.
Supervisor: Not available Sponsor: Not available
Qualification Name: Not available Qualification Level: Doctoral
EThOS ID:  DOI: Not available