OFDM/OQAM이 적용된 저궤도위성통신체계의 PAPR 저감을 위한 저복잡도 적응형 SLM 기법

양성훈¹^{, *} ; 최경억²

1해군소령/해군본부 기획관리참모부 지휘통제전력사업담당
2해군대령/해군본부 기획관리참모부 공통전력과장

Low Complexity Adaptive SLM Method to Reduce PAPR of OFDM/OQAM Signals for LEO SatComm System

Sunghoon Yang¹^{, *} ; Gyung Uk Choi²

1LCDR/C4I Force Program Manager, Office of DCNO for Planning and Management, ROK Navy HQ
2CAPT/Chief of Common Force Branch, Office of DCNO for Planning and Management, ROK Navy HQ

Correspondence to: ^*Sunghoon Yang Department of Electronic Engineering, Gyeongsang National University, Jinju-si, Jinjudae-ro 501 Gyeongsangnam-do, 52828, Korea Tel: +82-55-772-1726 E-mail: jikoh@gnu.ac.kr

초록

본 논문에서는 OFDM/OQAM 신호의 PAPR 저감을 위해, 신호의 각 인터벌 마다 중첩된 심볼에 의한 PAPR을 사전에 정의된 임계치와 비교하고, 그 결과에 따라 연산과정을 적응적으로 사용하는 SLM 기법을 개발하였다. 제안된 기법은 OFDM/OQAM에서 SLM 기법을 이용하여 얻을 수 있는 최적 성능에 근접한 성능을 보이면서도 부가적인 복잡도 증가는 제한할 수 있음을 전산모의실험으로 확인하였다.

Abstract

In this paper, we propose adaptive SLM Method which demonstrates PAPR reduction perfomance approaching to SLM optimal performance and prevents exponential incline of complexity when applying SLM for OFDM/OQAM. Even if the signal has high PAPR, high peak does no happen often in whole signal. Proposed method is based on this idea. Basically, it carries out the Basic Search of low complexity during searching the phase rotation vector to reduce PAPR for each symbol. And it carries out the Extended Search of high complexity for only the symbol that has high peak.

Keywords:

OFDM/OQAM, Peak-to-Average Power Ratio, PAPR reduction, Selective Mapping, Overlapped Structure, Adaptive

키워드:

첨두대평균전력비, PAPR 저감, 선택사상기법, 중첩구조, 적응형

References

TTAS.KO-07.0024/R1, "지상파 디지털멀티미디어방송(DMB) 송수신정합 표준"
3GPP TS 36.201 "E-UTRA - LTE Physical Layer - General Description" v. 12.2.0. Mar. 2015.
IEEE Std 802.11-2012 Local and metropolitan area networks—Specific Requirements—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, Mar. 2012.
B. Farhang-Boroujeny, "OFDM Versus Filter Bank Multicarrier," IEEE Signal Process. Mag., Vol. 28, No. 3, pp. 92–112, May 2011. [https://doi.org/10.1109/MSP.2011.940267]
L. Fa‐Long, Digital Front‐End in Wireless Communications and Broadcasting: Circuits and Signal Processing, New York, USA: Cambridge Univ. Press, 2011.
S. Han, and J. Lee, "An Overview of Peak-to-Average Power Ratio Reduction Techniques For Multicarrier Transmission," IEEE Wireless. Commun., Vol. 12, No. 2, pp.56-65, April. 2005. [https://doi.org/10.1109/MWC.2005.1421929]
T. Jiang, and Y. Wu, "An Overview: Peak-to-average Power Ratio of OFDM Signals," IEEE Trans. Broadcast., Vol. 54, No. 2, pp. 257–268, June. 2008. [https://doi.org/10.1109/TBC.2008.915770]
R. O'Neill, and L. B. Lopes, "Envelope Variations and Spectral Splatter in Clipped Multicarrier Signals," in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC '95), Toronto, Canada, Sept. 1995, pp. 71-75.
X. Wang, T. T. Tjhung, and C. S. Ng, "Reduction of Peak-to-average Power Ratio of OFDM System Using a Companding Technique," IEEE Trans. Broadcast., Vol. 45, No. 3, pp. 303-307, Sept. 1999. [https://doi.org/10.1109/11.796272]
B. S. Krongold, and D. L. Jones, "PAR Reduction in OFDM via Active Constellation Extension," IEEE Trans. Broadcast., Vol. 49, No. 3, pp. 258-68, Sept. 2003. [https://doi.org/10.1109/TBC.2003.817088]
S. H. Müller, and J. B. Huber, "OFDM With Reduced Peak-to-Average Power Ratio by Optimum Combination of Partial Transmit Sequences," Elect. Lett., Vol. 33, No. 5, Feb. 1997, pp. 368-369. [https://doi.org/10.1049/el:19970266]
R. W. Bäuml, R. F. H. Fisher, and J. B. Huber, "Reducing the Peak-to-Average Power Ratio of Multicarrier Modulation by Selected Mapping," Elect. Lett., Vol. 32, No. 22, Oct. 1996, pp. 2056–2057. [https://doi.org/10.1049/el:19961384]
Y. Zhou, T. Jiang, C. Huang, and S. Cui, "Peak-to-Average Power Ratio Reduction for OFDM/OQAM Signals via Alternative-Signal Method," IEEE Trans. Veh Technol., Vol. 63, No. 1, pp. 494-499, Jan. 2014. [https://doi.org/10.1109/TVT.2013.2273557]
O. Kwon, and Y. Ha, "Multi-carrier PAP Reduction Method Using Suboptimal PTS With Threshold," IEEE Trans. Broadcast., Vol. 49, No. 2, pp. 232–236, Jun. 2003. [https://doi.org/10.1109/TBC.2003.813648]
P. Siohan, and C. Siclet, N. Lacaille, "Analysis and Design of OFDM/OQAM Systems Based on Filterbank Theory," IEEE Trans. Signal Process., Vol. 50, No. 5, pp. 1170–1183, May 2002. [https://doi.org/10.1109/78.995073]
B. Le Floch, M, Alard, and C. Berrou, "Coded Orthogonal Frequency Division Multiplex," Proceedings of the IEEE, Vol.83, No.6, pp. 982-996, June 1995. [https://doi.org/10.1109/5.387096]
P. Siohan, and C. Roche, "Cosine-modulated Filterbanks Based on Extended Gaussian Functions," IEEE Trans. Signal Proces., Vol.48, No.11, pp. 3052-3061, Nov. 2000. [https://doi.org/10.1109/78.875463]
A. Skrzypczak, J.-P. Javaudin, and P. Siohan, "Reduction of the Peak-to-average Power Ratio for OFDM/OQAM Modulation," in The IEEE 63rd Veh. Technol. Conf.(VTC2006-Spring), Vol. 4, pp. 2018-2022, May 2006. [https://doi.org/10.1109/vetecs.2006.1683200]
D. Qu, S. Lu, and T. Jiang, "Multi-Block Joint Optimization for the Peak-to-Average Power Ratio Reduction of FBMC-OQAM Signals," IEEE Trans. Signal Proces., Vol. 61, No. 7, pp. 1605-1613, April. 2013. [https://doi.org/10.1109/TSP.2013.2239991]
C. Rapp, "Effects of HPA-Nonlinearity on a 4-DPSK/OFDM Signal for a Digital Sound Broadcasting System," in Proceedings of the Second European Conference on Satellite Communications, Liège, Belgium, October 22-24, 1991, pp.179-184, Oct. 1991.