Analysis of Near-Capacity Iterative Decoding Schemes for Wireless Communication Using EXIT Charts

Nasru Minallah,Songzuo Liu,Ishtiaque Ahmed,Imran Ullah Khan,Muhammad Fasih Uddin Butt,Khurram S Khattak,Gang Qiao

doi:10.1109/access.2020.3006024

Nasru Minallah, Songzuo Liu + Show 5 more

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This article proposes and compares the performance of three flexible and bandwidth efficient transceivers. The terminology of Over-Complete Mapping (OCM) is introduced in the first two schemes. All of the schemes, namely Non-Convergent Serial Concatenated OCM Coding (NCSCOC), Convergent Serial Concatenated OCM Coding (CSCOC) and Self-Concatenated Convolutional Coding (SECCC); are simulated for the Rayleigh channel and employing iterative decoding to attain the refined output stream for feeding the video decoder. Specifically, the iterative decoding is beneficial in acquiring the convergence of EXtrinsic Information Transfer (EXIT) curves by repeatedly sharing of the mutual information. The difference between the NCSCOC and CSCOC schemes lies in the inner and outer rates. This change reflects an improvement in the Bit-Error Rate (BER) and improved EXIT convergence of CSCOC scheme, with reference to NCSCOC scheme. Results show that NCSCOC scheme never reaches the point of perfect convergence despite iterative decoding. However, CSCOC and SECCC schemes succeed in securing perfect convergence. Investigating the BER curves, it is deducible that SECCC is the most desirable transceiver system, having the least BER. Furthermore, it is plausible that the overall performance of SECCC is much better than the preceding schemes. Explicitly, our experimental results show that the proposed CSCOC scheme outperforms its identical code rate counterpart NCSCOC scheme by about 3 dB at the Peak Signal-to-Noise Ratio (PSNR) degradation point of 1 dB. Additionally, an E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">b</sub> /N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> gain of 20 dB is attained using SECCC scheme relative to identical code rate NCSCOC benchmarked scheme.

Highlights

Since the past few decades, wireless communication has revolutionized the outlook of fast and ubiquitous communication
Comparison of the proposed channel coding schemes on account of the Bit-Error Rate (BER) curves, as in Fig.11 reveals that the Self-Concatenated Convolutional Coding (SECCC) scheme outperforms the Non-Convergent Serial Concatenated OCM Coding (NCSCOC) and Convergent Serial Concatenated OCM Coding (CSCOC) schemes, while setting the overall code rate equal in all the schemes
Though convergence is achieved in CSCOC scheme, but the BER curve of SECCC is significantly better than the CSCOC scheme

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Introduction

Since the past few decades, wireless communication has revolutionized the outlook of fast and ubiquitous communication. Wireless services were mostly used by the rich and some important security authorities, mainly due to the high power cost requirements. Researcher have put dedicated efforts to overcome the issue of power requirements while maintaining high data rate with a low error rate. Generation 5G communication aims at increasing the data rate manifolds in comparison with the 4G technology, by utilizing huge bandwidth available [3]. This escalation in the demand of wireless services is expected to grow continually, so researchers have to inevitably keep on designing efficient systems. Researchers believe that it is impractical to expect any fixed coding and modulation design that could best fit in a longer run [4]

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