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Improved Turbo Decoding Using Soft Combining Principle

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Abstract

One great challenge in wireless communication systems is to ensure reliable communications. Turbo codes are known by their interesting capabilities to deal with transmission errors. In this paper, we present a novel turbo decoding scheme based on soft combining principle. Our method improves decoding performance using soft combining technique inside the turbo decoder. Working on Max-Log-Maximum a Posteriori (Max-Log-MAP) turbo decoding algorithm and using an Additive White Gaussian Noise (AWGN) channel model and 16 Quadrature Amplitude Modulation (16QAM), simulation results show that the suggested solution is efficient and outperforms the conventional Max-Log-MAP algorithm in terms of Bit Error Rate (BER). The performance analysis is carried out in terms of BER by varying parameters such as the Energy per bit to Noise power spectral density ratio (\(\text {E}_{\text {b}}/\text {N}_{\text {o}}\)), and decoding iterations number. We call our proposed solution Soft Combined Turbo Codes.

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Authors and Affiliations

  1. Laboratoire des Technologies de l’Information et de la Communication, Ecole Nationale des Sciences Appliquées, Université Abdelmalek Essaadi, Tangier, Morocco

    Salima El Makhtari, Mohamed Moussaoui & Hassan Samadi

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  1. Salima El Makhtari
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  2. Mohamed Moussaoui
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  3. Hassan Samadi
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Correspondence to Salima El Makhtari.

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El Makhtari, S., Moussaoui, M. & Samadi, H. Improved Turbo Decoding Using Soft Combining Principle. Wireless Pers Commun 78, 1115–1127 (2014). https://doi.org/10.1007/s11277-014-1805-0

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  • DOI: https://doi.org/10.1007/s11277-014-1805-0

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