Дослідження каскадних кодів та турбокодів
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Файли
Дата
2018
Автори
Пятін, І.С.
Мішан, В.В.
Вершков, Д.В.
Pyatin, I.S.
Mishan, V.V.
Vershkov, D.B.
Назва журналу
Номер ISSN
Назва тому
Видавець
Хмельницький національний університет
Анотація
В роботі проведений аналіз побудови завадостійких кодів, заснованих на послідовному або паралельному
з’єднанні складових кодів. Представлено порівняння ефективності каскадних кодів і турбокодів з відокремленим
використанням їх складових. Показано, що кращим характеристикам відповідає каскадне з’єднання декількох
складових кодів. Досліджено алгоритм ітеративного декодування турбокодів, ефективність турбокоду у
порівнянні зі згортковим. Зроблений висновок, що турбокод ефективніше послідовного каскадного на 2,5 дБ.
To ensure the minimum probability of mistaken reception of information, it is necessary to use interference-encoding. The purpose of the paper is to investigate the efficiency of cascading codes and turbo codes compared to other methods of noise immunity encoding. In this work an analysis of the construction of noise immunity codes based on the sequential or parallel connection of component codes is carried out. The method of implementing cascading codes consists in the sequential connection of two or more codes. The most common is a circuit with two levels of coding. The paper investigates the cascading coding system, where the Reed-Solomon code is used as an external code, and as an internal - convolutional code. The internal code is decoded by the Viterbi decoder, and the external one is the decoder of Reed-Solomon. It is found that cascading code is more efficiently converting at 5 dB at the level of BER = 10-4. The turbo code is found to be 5.5 dB more efficiently. Simulink-model of the communication system with turbo coding and iterative decoding is researched. It is found that the use of five iteration of decoding a posterior probability (APP) turbo code is more effective than another iteration of 1.7 dB for BER = 10-6. The comparison of the efficiency of cascading codes and turbo codes with the separate use of their constituents is presented. It is shown that the cascading connection of several constituent codes corresponds to the best characteristics. The efficiency of turbo code in comparison with conveying is studied. It is concluded that the turbo code is more efficient than the successive cascade at 2.5 dB.
To ensure the minimum probability of mistaken reception of information, it is necessary to use interference-encoding. The purpose of the paper is to investigate the efficiency of cascading codes and turbo codes compared to other methods of noise immunity encoding. In this work an analysis of the construction of noise immunity codes based on the sequential or parallel connection of component codes is carried out. The method of implementing cascading codes consists in the sequential connection of two or more codes. The most common is a circuit with two levels of coding. The paper investigates the cascading coding system, where the Reed-Solomon code is used as an external code, and as an internal - convolutional code. The internal code is decoded by the Viterbi decoder, and the external one is the decoder of Reed-Solomon. It is found that cascading code is more efficiently converting at 5 dB at the level of BER = 10-4. The turbo code is found to be 5.5 dB more efficiently. Simulink-model of the communication system with turbo coding and iterative decoding is researched. It is found that the use of five iteration of decoding a posterior probability (APP) turbo code is more effective than another iteration of 1.7 dB for BER = 10-6. The comparison of the efficiency of cascading codes and turbo codes with the separate use of their constituents is presented. It is shown that the cascading connection of several constituent codes corresponds to the best characteristics. The efficiency of turbo code in comparison with conveying is studied. It is concluded that the turbo code is more efficient than the successive cascade at 2.5 dB.
Опис
Ключові слова
каскадний код, турбокод, завадостійке кодування, concatenated codes, turbo codes, antinoise coding
Бібліографічний опис
Пятін, І.С. Дослідження каскадних кодів та турбокодів [Текст] / І. С. Пятін, В. В. Мішан, Д. В. Вершков // Вісник Хмельницького національного університету. Технічні науки. – 2018. – № 6, т. 1. – С. 85-91.