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http://dx.doi.org/10.5573/ieek.2013.50.8.028

Design and Performance Evaluation of Improved Turbo Equalizer  

An, Changyoung (Department of Electronic Engineering, Chungbuk National University)
Ryu, Heung-Gyoon (Department of Electronic Engineering, Chungbuk National University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.8, 2013 , pp. 28-38 More about this Journal
Abstract
In this paper, we propose a improved turbo equalizer which generates a feedback signal through a simple calculation to improve performance in single carrier system with the LMS(least mean square) algorithm based equalizer and LDPC(low density parity check) codes. LDPC codes can approach the Shannon limit performance closely. However, computational complexity of LDPC codes is greatly increased by increasing the repetition of the LDPC codes and using a long parity check matrix in harsh environments. Turbo equalization based on LDPC code is used for improvement of system performance. In this system, there is a disadvantage of very large amount of computation due to the increase of the repetition number. To less down the amount of this complicated calculation, The proposed improved turbo equalizer adjusts the adoptive equalizer after the soft decision and the LDPC code. Through the simulation results, it's confirmed that performance of improved turbo equalizer is close to the SISO-MMSE(soft input soft output minimum mean square error) turbo equalizer based on LDPC code with the smaller amount of calculation.
Keywords
improved turbo equalizer; LDPC code; low complexity; LMS algorithm;
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1 Futaki, H., Ohtsuki, T., "Low-density parity-check (LDPC) coded MIMO systems with iterative turbo decoding," Vehicular Technology Conference 2003. (VTC 2003-Fall), pp. 342-346, Orlando, Florida, USA, Oct. 2003.
2 D. J. MacKay, "Good error correcting codes based on very sparse matrices", IEEE Trans. Inform. Theory, vol. 45, pp. 399-431, Mar. 1999.   DOI   ScienceOn
3 Richardson, T.J., Urbanke, R.L., "The capacity of low-density parity-check codes under message-passing decoding," Information Theory, IEEE Transactions on, vol. 47, no. 2, pp. 599-618, Feb 2001.   DOI   ScienceOn
4 Po-Hui Yang, Jung-Chieh Chen, Ya-Ting Chan, Ming-Yu Lin, "A simplified addition operation Log-SPA LDPC decoder," The 14th Asia-Pacific Conference on Communications (APCC 2008), pp. 1-4, Tokyo, Japan, Oct. 2008.
5 Tüchler, M., Koetter, R., Singer, A.C., "Turbo equalization: principles and new results," Communications, IEEE Transactions on, vol. 50, no. 5, pp. 754-767, May 2002.   DOI   ScienceOn
6 Fertonani, D., Barbieri, A., Colavolpe, G., "Reduced-Complexity BCJR Algorithm for Turbo Equalization," Communications, IEEE Transactions on, vol. 55, no. 12, pp. 2279-2287, Dec. 2007.   DOI   ScienceOn
7 Qing. S. T., Dong S. H., "Performance Analysis of DVB-T2 Turbo Equalization with LDPC and MAP Detector," The Korean Society of Broadcast Engineers, vol. 15, no. 5, pp. 665-671, Sep. 2010.
8 Abu-Surra, S., Ryan, W.E., Divsalar, D., "Asymptotic ensemble enumerators for protograph-based generalized LDPC codes: Computational complexity," Information Theory and Applications Workshop, 2008, pp. 63-65, UCSD, USA, Jan.-Feb. 2008.
9 Do-Hoon Kim, Heung-Gyoon Ryu, "An efficient blind Pseudo turbo equalizer with CMA and SAGMCMA for single-carrier system," 15th International Conference on Advanced Computing Technologies (ICACT- 2013), pp. 418-422, Korea, Pyeongchang, Jan. 2013.
10 Zogovic, N., Dimic, G., Bajic, D., "PHY-MAC cross-layer approach to energy-efficiency improvement in low-power communications," 8th International Symposium on Wireless Communication Systems (ISWCS 2011), pp. 402-406, Aachen, Germany, Nov. 2011.
11 Saad, W., El-Fishawy, N., El-Rabaie, S., Shokair, M., "An efficient designed prototype technique for OFDM PAPR reduction using FPGA," Japan-Egypt Conference on Electronics, Communications and Computers (JEC-ECC 2012), pp. 47-52, Alexandria, Egypt, Mar. 2012.
12 Qureshi, S.U.H., "Adaptive equalization," Proceedings of the IEEE, vol. 73, no .9, pp. 1349-1387, Sept. 1985.   DOI   ScienceOn
13 Do-Hoon Kim, Heugn-Gyoon Ryu, Rahman, T.A., "Analysis and performance evaluation of turbo equalizer for fast equalization in single-carrier system," ICT Convergence (ICTC), 2012 International Conference on, pp. 642-646, Jeju island, Korea, Oct. 2012.
14 Pancaldi, F., Vitetta, G.M., Kalbasi, R., Al-Dhahir, N., Uysal, M., Mheidat, H., "Single-carrier frequency domain equalization," Signal Processing Magazine, IEEE , vol. 25, no. 5, pp. 37-56, September 2008.