Performance Improvement of the Flattening Effect of the new Asymmetric Turbo Codes 


Vol. 27,  No. 6, pp. 533-539, Jun.  2002


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  Abstract

It is well known the fact that turbo codes has better performance as the number of iteration and the inter-leaver size increases in the AWGN channel environment. However, as the number of iteration and the interleaver size are increased, it is required much delay and computation for iterative decoding, and caused the flattening effect phenomenon which is very littel BER performance improvement at the arbitrary SNR. In this paper, We proposed the new asymmetric turbo codes, which consist of parallel concatenated turbo codes that use mixed types of component codes with different not only constraint length but also generate polynomial and analyzed its BER performance for log-MAP decoding algorithm with frame size of 128, 256, 512 and 1024 bits, and coding rate of 1/3. As a results of simulation, proposed asymmetric turbo codes verify that its BER performance is superior to conventional symmetric turbo codes. It can be also observed that the flattening effect phenomenon is very reduced by applying the proposed asymmetric turbo codes. It gains respectively 1.7dB ~2.5dB and 2.0dB~2.5dB SNR improvements in the case of short frame(128, 256) and large frame(512, 1024) size for the BER 10⁴ region.

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  Cite this article

[IEEE Style]

D. Jeong, S. Jung, K. Chung, H. Kim, "Performance Improvement of the Flattening Effect of the new Asymmetric Turbo Codes," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 6, pp. 533-539, 2002. DOI: .

[ACM Style]

Dae-ho Jeong, Sung-tae Jung, Kyung-taek Chung, and Hwan-yong Kim. 2002. Performance Improvement of the Flattening Effect of the new Asymmetric Turbo Codes. The Journal of Korean Institute of Communications and Information Sciences, 27, 6, (2002), 533-539. DOI: .

[KICS Style]

Dae-ho Jeong, Sung-tae Jung, Kyung-taek Chung, Hwan-yong Kim, "Performance Improvement of the Flattening Effect of the new Asymmetric Turbo Codes," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 6, pp. 533-539, 6. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880