THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2017 Nov.; 28(11), 837 842. http://dx.doi.org/10.5515/kjkiees.2017.28.11.837 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) 8PSK-TCM Design and Performance Evaluation of 8PSK-TCM System Using Turbo Equalizer for Satellite Communication 안창영 유상범 이상규 유흥균 Changyoung An Sang-Burm Ryu* Sang-Gyu Lee* Heung-Gyoon Ryu 요약 CCSDS(Consultative Committe for Space Data Systems) X (X-Band) 4D(Dimension)-8PSK(Phase Shift Keying)-TCM(Trellis Coded Modulation) 8PSK-TCM,. AWGN, Proakis B, Proakis C, 8PSK 8PSK-TCM BER., 8PSK 8PSK-TCM BER, 8PSK-TCM ISI BER. 8PSK-TCM 5 Proakis B 10-3 BER 5.9 db SNR, Proakis C 10-2 BER 9.1 db SNR. Abstract In this paper, as a basic study for combination of turbo equalizer and 4D-8PSK-TCM(4 Dimensional 8 Phase Shift Keying Trellis Coded Modulation) system, which is recommended for X-band band satellite communication in CCSDS, a system combining 8PSK- TCM system and turbo equalizer has designed and performance evaluation of the system has performed. BER performance of 8PSK and 8PSK-TCM systems has evaluated and analyzed in AWGN, Proakis B and Proakis C channels in detail. As results of simulation, BER performance of 8PSK-TCM system is better than 8PSK system in AWGN environment. Furthermore, it can be confirmed that the system combining the 8PSK-TCM system with the turbo equalizer can further improve the BER performance through iterative equalization in the ISI channel environment. The 8PSK-TCM system combined with the turbo equalizer requires SNR of 5.9 db for BER performance of 10-3 with 5 iterative equalization in Proakis B and SNR of 9.1 db for BER of 10-2 with 5 iterative equalization in Proakis C. Key words: TCM, 8PSK-TCM, Turbo Equalizer, Satellite Communication, ISI Channel 2017. (Department of Electronics Engineering, Chungbuk National University) * (Payload Electronics Team, Korea Aerospace Research Institute) Manuscript received July, 14, 2017 ; Revised October, 20, 2017 ; Accepted October, 25, 2017. (ID No. 20170714-066) Corresponding Author: Heung-Gyoon Ryu (e-mail: ecomm@cbu.ac.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 837
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 11, Nov. 2017.. 서론 [1]. 25 30 cm. 800 1,200 Mbps. (Consultative Committe for Space Data Systems: CCSDS) X 4-D(Dimension) 8PSK(Phase Shift Keying) TCM(Trellis Coded Modulation) [2]. CCSDS 4D-8PSK-TCM [3] [5]. TCM. TCM [6]. TCM PSK QAM(Quadrature Amplitude Modulation) (trellis). 8PSK 8PSK-TCM. ISI(Inter-Symbol Interference),.,, ISI. ISI ZF(Zero Forcing), MMSE(Minimum Mean Square Error), ML(Maximum Likelihood),, [7],[8]. ISI. ISI [9]. CCSDS X 4D-8PSK-TCM, 8PSK-TCM,., 8PSK-TCM 8PSK-TCM, MAP(Maximum A Posteriori) TCM. 8PSK-TCM AWGN, Proakis B, Proakis C. 2-1 8PSK-TCM. 시스템모델 1 8PSK-TCM. 8PSK- TCM, 2 b0, b1., b1 1/2 (convolution coding) c0, c1., b0 c0, c1 8PSK [6]. Viterbi TCM 8PSK-TCM [6]. 2 8PSK-TCM. 2 1/2 8PSK- TCM. 그림 1. 8PSK-TCM Fig. 1. Block diagram of 8PSK-TCM system. 838
8PSK-TCM 그림 2. 8PSK-TCM Fig. 2. Convolution coder for 8PSK-TCM modulation. 2-2 Turbo Equalization 3.,. (interleaving). 8PSK., MAP(Maximum A Posteriori Probability) 1 [8]. Log LLR(Log Likelihood Ratio). (deinterleaving), LLR [8]. LLR, MAP 그림 4. 8PSK-TCM Fig. 4. Block diagram of 8PSK-TCM system using turbo equalizer.., [8]. 2-3 터보등화기를사용하는 8PSK-TCM 4 8PSK-TCM. 8PSK- TCM., MAP. MAP LLR., Viterbi TCM., TCM TCM. MAP. TCM.. 시뮬레이션결과및분석 그림 3. Fig. 3. Block diagram of turbo equalizer system. 8PSK, 8PSK-TCM, 8PSK-TCM,. 1. 8PSK TCM 1/2. TCM Viterbi. 839
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 11, Nov. 2017. 표 1. Table 1. Simulation parameters. Parameter Modulation Value 8PSK, 8PSK-TCM Code rate of convolution coder for TCM 1/2 TCM decoding Inner equalizer for turbo equalization Interleaver for 8PSK-TCM Viterbi algorithm MAP equalizer Symbol interleaver # of symbol per tx block 1,024 Channel AWGN, Proakis B channel, Proakis C channel Iteration for turbo equalization 0, 1, 2, 3, 4, 5 MAP. TCM (burst error). 1,024, AWGN (Additive White Gaussian Noise), Proakis B, Proakis C. ISI 8PSK MAP, 8PSK- TCM MAP. 5 8PSK 8PSK-TCM BER. 8PSK-TCM TCM 1/2 2/3. AWGN 8PSK-TCM BER. 8PSK SNR 5.5 db 10-4 BER, 8PSK-TCM SNR 10 db 10-4 BER. 10-4 BER 8PSK-TCM 4 db SNR. 6 Proakis B 8PSK-TCM BER. QPSK Proakis B MAP 10-2 BER 7 db SNR. 8PSK-TCM MAP, 10-2 BER 7.7 db SNR., 8PSK-TCM BER. Proakis B, 그림 5. 8PSK 8PSK-TCM BER Fig. 5. BER performance of 8PSK and 8PSK-TCM system. 그림 6. Proakia B 8PSK- TCM BER Fig. 6. BER performance of 8PSK-TCM system using turbo equalizer in Proakis B channel. 840
8PSK-TCM, ISI. AWGN 8PSK- TCM 8PSK, ISI 8PSK- TCM 8PSK., 8PSK- TCM BER. References 그림 7. Proakia C 8PSK- TCM BER Fig. 7. BER performance of 8PSK-TCM system using turbo equalizer in Proakis C channel. 8PSK-TCM 5, 10-4 BER 5.9 db SNR. 7 Proakis C 8PSK-TCM BER. QPSK Proakis C MAP 10-2 BER 10.4 db SNR. 8PSK-TCM, MAP, SNR 10 db 6 10-2 BER., ISI 8PSK-TCM BER. Proakis C, 8PSK-TCM 5, 10-2 BER, 9.1 db SNR.. 결론 8PSK-TCM [1] Space Imaging Middle East, WorldView3, [Online]. Available: https://www.spaceimagingme.com/downloads/sensors/ datasheets/dg_worldview3_ds_2014.pdf [2] Radio Frequency and Modulation Systems - Part 1: Earth Stations and Spacecraft, CCSDS 401.0-B: Blue Book, Issue 2000-06, Apr. 2009. [3] A. Guérin, G. Lesthievent, and J.-L. Issler, "Telemetry architectures for future earth observation missions: Over 1 Gbit/s in X-band", in ITC2010, pp. 1-10, San Diego, 2010. [4] Christine M. Hartzell, "Data system design for a hyperspectral imaging mission concept", in 2009 IEEE Aerospace Conference, pp. 1-21, Mar. 2009. [5] W. Fong, A. Gray, and P.-S. Yeh, "Bandwidth efficient baseband multi-modulator", in NASA Earth Science Technology Conference, Jun. 2003. [6] L. Huang, J. Wang, J. Zhu, J. Yang, F. Ren, and X. Liu, "Research on 4-D 8PSK TCM decoding algorithm", in Proceedings of 2012 2nd International Conference on Computer Science and Network Technology, Changchun, 2012, pp. 1894-1897. [7] C. Tuna, "Comparison of BER performances of MMSE equalizer and viterbi algorithm for the MLSE solution in 60 GHz communication channel", in 2015 9th International Conference on Electrical and Electronics Engineering (ELECO), Bursa, Nov. 2015, pp. 1212-1215. [8] M. Tuchler, R. Koetter, and A. C. Singer, "Turbo equalization: principles and new results", in IEEE Transactions 841
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