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Open AccessArticle

Improving the Performance of Turbo-Coded Systems under Suzuki Fading Channels

by Ali J. Al-Askery 1,*,†, Ali Al-Naji 1,2,† and Mohammed Sameer Alsabah 1,†
1
Electrical Engineering Technical College, Middle Technical University, Al Doura 10022, Baghdad, Iraq
2
School of Engineering, University of South Australia, Mawson Lakes, SA 5095, Australia
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
J. Low Power Electron. Appl. 2019, 9(2), 13; https://doi.org/10.3390/jlpea9020013
Received: 7 February 2019 / Revised: 10 March 2019 / Accepted: 25 March 2019 / Published: 29 March 2019
(This article belongs to the Special Issue Emerging Interconnection Networks Across Scales)
In this paper, the performance of coded systems is considered in the presence of Suzuki fading channels, which is a combination of both short-fading and long-fading channels. The problem in manipulating a Suzuki fading model is the complicated integration involved in the evaluation of the Suzuki probability density function (PDF). In this paper, we calculated noise PDF after the zero-forcing equalizer (ZFE) at the receiver end with several approaches. In addition, we used the derived PDF to calculate the log-likelihood ratios (LLRs) for turbo-coded systems, and results were compared to Gaussian distribution-based LLRs. The results showed a 2 dB improvement in performance compared to traditional LLRs at 10 6 of the bit error rate (BER) with no added complexity. Simulations were obtained utilizing the Matlab program, and results showed good improvement in the performance of the turbo-coded system with the proposed LLRs compared to Gaussian-based LLRs. View Full-Text
Keywords: log-normal distribution; Rayleigh distribution; Suzuki distribution log-normal distribution; Rayleigh distribution; Suzuki distribution
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Al-Askery, A.J.; Al-Naji, A.; Alsabah, M.S. Improving the Performance of Turbo-Coded Systems under Suzuki Fading Channels. J. Low Power Electron. Appl. 2019, 9, 13.

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