Investigation and Improvement of Maximum Likelihood Channel Estimator in OFDM Systems


Mohamed, Khalid Sheikhidris and Alias, Mohamad Yusoff and Roslee, Mardeni (2017) Investigation and Improvement of Maximum Likelihood Channel Estimator in OFDM Systems. In: 2017 International Conference on Platform Technology and Service (PlatCon). IEEE, pp. 1-4. ISBN 978-1-5090-5140-3, 978-1-5090-5141-0

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Frequency offsets are the most destructive effects to the orthogonality between carriers, also known as Inter-Carrier-Interference (ICI) in OFDM systems. This offset can be corrected by implementing a proper correction scheme which relies on channel estimation techniques such as Maximum Likelihood Channel Estimator (MMLE). Further improvements enhance the reliability, Accuracy and Quality of Service (QoS) of OFDM. This paper studies MMLE behavior to improve the limitation and the overall performance of channel estimation process using matlab simulation software and propose an improved version of MMLE which shows the noticeable degradation of Bit Error Rate (BER). Simulation results shows that lower Bit Error Rates (BER) can be achieved using this improved method which further achieves more orthogonal OFDM carriers and less ICI.

Item Type: Book Section
Uncontrolled Keywords: Orthogonal frequency division multiplexing, OFDM, Channel estimation, Frequency estimation, Bit error rate, Maximum likelihood estimation, Doppler shift
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 27 Oct 2020 15:03
Last Modified: 27 Oct 2020 15:03


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