• Title/Summary/Keyword: Turbo 부호

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Analysis of Turbo Coding and Decoding Algorithm for DVB-RCS Next Generation (DVB-RCS Next Generation을 위한 터보 부복호화 방식 분석)

  • Kim, Min-Hyuk;Park, Tae-Doo;Lim, Byeong-Su;Lee, In-Ki;Oh, Deock-Gil;Jung, Ji-Won
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.9C
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    • pp.537-545
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    • 2011
  • This paper analyzed performance of three dimensional turbo code and turbo ${\Phi}$ codes proposed in the next generation DVB-RCS systems. In the view of turbo ${\Phi}$ codes, we proposed the optimal permutation and puncturing patterns for triple binary input data. We also proposed optimal post-encoder types and interleaving algorithm for three dimensional turbo codes. Based on optimal parameters, we simulated both turbo codes, and we confirmed that the performance of turbo ${\Phi}$ codes are better than that of three dimensional turbo codes. However, the complexity of turbo ${\Phi}$ is more complex than that of three dimensional turbo codes by 18%.

Experiment performance analysis of turbo code based turbo equalizer (터보 부호 기반의 터보 등화기 실험 성능 분석)

  • Park, Gun-woong;Jung, Ji-won
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.7
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    • pp.1525-1530
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    • 2015
  • In this paper, We analyzed the performance of turbo equalizer using turbo codes thorough the under water experiment. To compensate the distorted signal induced by multipath effect, we apply the iterative turbo codes that iteratively exchange probabilistic information between LMS-DFE and turbo decoder, thereby reducing the error rates significantly. We showed the successful of turbo decoding of iterative turbo equalizer is 93%.

Design and performance analysis of turbo codes employing the variable-sized interleaver (가변 크기 인터리버를 사용한 turbo 부호의 설계와 성능 해석)

  • Lee, Chang-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.2A
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    • pp.86-95
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    • 2003
  • With the advent of future mobile communication systems, the wireless transmission of the huge amount of multimedia data over the error-prone multipath fading channel has to overcome the inherent sensitivity to channel errors. To alleviate the effect of the channel errors, hosts of techniques based on the forward error correction(FEC) has been proposed at the cost of overhead rate. Among the FEC techniques, turbo code, whose performance has been shown to be very close to the Shannon limit, can be classified as a block-based error correction code. In this paper, considering the variable packet size of the multimedia data, we analyzed turbo codes employing the variable-sized interleaver. The effect of the various parameters on the BER performance is analyzed. We show that the turbo codes can be used as efficient error correction codes of multimedia data.

Analysis Performance of Convolutional Code and Turbo code Using The Semi-Random Interleaver (길쌈부호와 세미 랜덤 인터리버를 사용한 터보코드의 성능분석)

  • 홍성원
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.6
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    • pp.1184-1189
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    • 2001
  • In this paper was analyzed the performance of turbo code using semi-random interleaver which proposed a reference numbers 11. Which was analyzed comparison the performance of between the current mobile communication system had been used the viterbe decoding algorithm of convolutional code and turbo codes when fixed constraint length. The result was defined that the performance of turbo code rose a $E_{b/}$ $N_{o}$=4.7[㏈] than convolutional code, when convolutional code and turbo code was fixed by BER = 10$^{-4}$ and constraint length K 5.5.5.

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LLR Based Generalization of Soft Decision Iterative Decoding Algorithms for Block Turbo Codes (LLR 기반 블록 터보 부호의 연판정 복호 알고리즘 일반화)

  • Im, Hyun-Ho;Kwon, Kyung-Hoon;Heo, Jun
    • Journal of Broadcast Engineering
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    • v.16 no.6
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    • pp.1026-1035
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    • 2011
  • This paper presents generalization and application for the conventional SISO decoding algorithm of Block Turbo Codes. R. M. Pyndiah suggested an iterative SISO decoding algorithm for Product Codes, two-dimensionally combined linear block codes, on AWGN channel. It wascalled Block Turbo Codes. Based on decision of Chase algorithm which is SIHO decoding method, SISO decoder for BTC computes soft decision information and transfers the information to next decoder for iterative decoding. Block Turbo Codes show Shannon limit approaching performance with a little iteration at high code rate on AWGN channel. In this paper we generalize the conventional decoding algorithm of Block Turbo Codes, under BPSK modulation and AWGN channel transmission assumption, to the LLR value based algorithm and suggest an application example such as concatenated structure of LDPC codes and Block Turbo Codes.

Improving The Performance of Turbo Code by Optimizing QAM Constellation (QAM 변조방식의 성상도 최적화를 통한 이진 터보 부호의 성능 개선)

  • Lee, Keun-Hyung;Lee, Ji-Yeon;Kang, Dong-Hoon;Oh, Wang-Rok
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.46 no.7
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    • pp.39-44
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    • 2009
  • It is well-known that the performance of turbo codes can be improved by allocating different energies per code symbol. In this paper, based on this observation, we propose a joint encoding and modulation scheme for quadrature amplitude modulated turbo code systems. In the proposed scheme, the amount of energy difference between the turbo coded symbols is optimized by optimizing the constellation of quadrature amplitude modulation (QAM). The proposed scheme offers better coding gain compared to the conventional combination of binary turbo code and QAM at the bit error rate of 10$^{-5}$. Also, the performance of binary turbo codes with the proposed QAM constellation for various code symbol mapping strategies are verified.

Performance of W-CDMA System with SOVA-based Turbo Decoder in ITU-R Realistic Channel (ITU-R 실측채널에서 SOVA 기반의 터보부호를 적용한 W-CDMA 시스템의 성능 분석)

  • Jeon Jun-Soo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.8
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    • pp.1613-1619
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    • 2004
  • Turbo codes of long block sizes have been known to show very good performance in an AWGN channel and the turbo code has been strongly recommended as error correction code for W-CDMA in 3GPP(3rd Generation Partnership Project). Recently, turbo codes of short block sizes suitable for real time communication systems have attracted a lot of attention. Thus, in this paper we consider the turbo code of 1/3 code rate and short frame size of 192 bits in ITU-R channel model. We analyzed the performance of W-CDMA systems of 10MHz bandwidths employing RAKE receiver with not only MRC diversity but also SOVA-based turbo code.

Serially Concatenated Space-Time Code using Iterative Decoding of High Data Rate Wireless Communication (고속 무선 통신을 위한 반복 복호 직렬 연쇄 시.공간 부호)

  • 김웅곤;구본진;양하영;강창언;홍대식
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.4A
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    • pp.519-527
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    • 2000
  • This paper suggests and analyzes the Serially Concatenated Space-Time Code(SCSTC) with the possibility of a efficient high-speed transmission in a band limited channel. The suggested code has a structure that uses the interleaver to connect the space-time code as an inner code and the convolutional code as a outer code serially. This code keeps the advantage of high-speed transmission and also has the high BER performance. The performance of the suggested system is compared with the conventional bandwidth efficient trellis coded modulation, such as a Serially Concatenated Trellis Coded Modulation (SCTCM) and a Turbo-Trellis Coded Modulation(Turbo-TCM). The results show that the suggested system has a 2.8dB and 3dB better BER performance than SCTCM and Turbo-TCM respectively in case of the transmission rate 2b/s/Hz in fading channel.

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Performance of Wireless ATM Cell Transmission with Concatenated Turbo and BCH Coding (터보코드와 BCH코드의 연쇄부호화를 이용한 무선 ATM셀 전송의 성능 분석)

  • 문병현;권광영
    • Journal of Korea Society of Industrial Information Systems
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    • v.7 no.2
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    • pp.1-5
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    • 2002
  • In this paper, a concatenated turbo and BCH coding is proposed for the wireless ATM cell transmission and the bit error rate(BER) and the cell loss ratio(CLR) for the Nosed system is obtained. Turbo code with code rate of 1/2 and BCH code with error correction capability of 5 and 15 bits are used in the simulations. It is shown that the proposed system obtained about 0.2 and 0.4 ㏈ gain over the conventional Turbo code at bit error rate of 0.001. Also the proposed system obtained about 0.1 and 0.2 ㏈ gain over the conventional Turbo code at cell loss rate of 0.01.

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Turbo Codes with DC-Free Trellis Codes as Constituent Codes (무직류 격자형부호를 구성부호기로 가지는 터보부호)

  • 이병길;정창기배상재주언경
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.175-178
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    • 1998
  • In this paper, turbo codes with the DC-free trellis codes based on partition chain as constituent codes are presente. And efficient methods to design the DC-free turbo codes are introduced. An iterative decoding with the MAP algorithm is used for the decoding of the turbo codes designed by various methods. As results of simulations, the presented DC-free turbo codes show better error performances than the DC-free trellis codes.

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