Concatenated turbo polar-convolutional codes based on soft cancellation algorithm

Alebady, Wallaa Yaseen; Hamad, Ahmed A.

doi:10.1016/j.phycom.2023.102010

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…The scheme of the cascade connection of recursive systematic convolutional codes (RSCC) in the turbo code, which was proposed by a group of French scientists [1], presents a turbo code with a speed of R=1/2 and a polynomial G=15/13, which was then approved in the third generation CDMA2000/LTE standard [2]. But as it was noted in works [3,4], when recursive systematic convolutional codes are connected in parallel in the turbo code, the phenomenon of the error floor (error floor) occurs in turbo codes -at values of the probability of a bit error from 10 -5 to 10 -6 the decrease in the probability of an error is slowed down. As further studies have shown, the phenomenon of the error threshold is affected by the type and parameters of the interleaver [4].…”

Section: Introductionmentioning

confidence: 99%

Modification of chaotic interleaver for turbo codes with a change to the duffing equation and accounting for the distance spectrum of the code

Topalov,

Tregubova,

Severyn

et al. 2023

EEJET

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Various types of interleavers in turbo codes and their parameters affecting the efficiency of turbo codes are considered. It is noted that the type of interleaver directly affects the efficiency and error correcting of turbo codes. Also, the efficiency of turbo codes is influenced by the parameters of the minimum distance, the length of interleaver, and the distance spectrum of the code. A modification of the chaotic interleaver of turbo codes is proposed with the change of the equation to the Duffing and with examining the code's distance spectrum with the condition of increasing the code's distance between the code words with a small weight. The algorithm for modifying the chaotic interleaver with the Duffing equation and with examining the code's distance spectrum of turbo codes is presented. The characteristics of the modified chaotic interleaver with the Duffing equation and with examining the code's distance spectrum of turbo codes according to various parameters of turbo codes are given. This modification of the interleaver of turbo codes increased the minimum distance between elements for different lengths of the interleaver and polynomials of the turbo code by 10 % …33 %. Given this, there was an increase in the energy efficiency of the turbo codes by 0,05, …, 0,25 dB in comparison with a chaotic interleaver without modification at the same value of the bit error probability. When increasing the length of the modified chaotic interleaver with the Duffing equation and applying distance spectrum of the code the increasing the energy efficiency of the turbo code slows down compared to the chaotic interleaver without modification. The application scope of the modified chaotic interleaving with the Duffing equation and with examining the code's distance spectrum of turbo codes is the infocommunication channels for mobile, wired, and satellite communications

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