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Orthogonal Frequency Division Multiplexing (OFDM) is considered as a strong candidate for future wireless communication because it is marked by its higher frequency multiplicity and greater immunity to multipath fading. However, the main drawback of OFDM is its high amplitude fluctuations measured by peak-to-average power ratio (PAPR), which leads to power inefficiency and requires expensive high power amplifier (HPA) with very good linearity. In this paper, we propose selected mapping (SLM) with predistortion technique to decrease the nonlinear distortion and to improve the power efficiency of the nonlinear HPA. In the proposed method SLM reduces the PAPR and improves the power efficiency, the predistorter improves the bit error rate (BER) performance of the system. The PAPR reduction is possible with SLM when compared with original OFDM. After reducing the PAPR with SLM the data goes into the HPA with and without predistorter. The BER performance curves of SLM method with or without predistorter shows that, predistorter operates more effectively in SLM method than original OFDM system. At 4 dB IBO (input backoff) the conventional method with predistorter achieves 1.8 dB SNR gain than conventional method without a predistorter and at 6 dB IBO the BER performance is towards the ideal linear amplifier. The proposed system will be evaluated for OFDM system in the presence of a nonlinear power amplifier.
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Tom
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86--91
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Bibliogr. 12 poz., rys.
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autor
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- Department of Electronics and Communication Engineering, Motilal Nehru National Institute of Technology (MNNIT), Telierganj, Allahabad-211004, India, pankaj354518@yahoo.com
Bibliografia
- [1] P. Banelli and S. Cacopardi, “Theoretical analysis and performance of OFDM signals in nonlinear AWGN channels”, IEEE Trans. Commun., vol. 48, no. 3, pp. 430–441, 2000.
- [2] C. van den Bos, M. H. L. Kouwenhoven, and W. A. Serdijin, “Effect of smooth nonlinear distortion on OFDM symbol error rate”, IEEE Trans. Commun., vol. 49, no. 9, pp. 1510–1514, 2001.
- [3] H. Ochiai and H. Imai, “Performance analysis of deliberately clipped OFDM signals”, IEEE Trans. Commun., vol. 50, no. 1, pp. 89–101, 2002.
- [4] E. Costa and S. Pupolin, “M-QAM-OFDM system performance in the presence of a nonlinear amplifier and phase noise”, IEEE Trans. Commun., vol. 50, no. 3, pp. 462–472, 2002.
- [5] K. R. Panta and J. Armstrong, “ Effects of clipping on the error performance of OFDM in frequency selective fading channels”, IEEE Trans. Wirel. Commun., vol. 3, no. 2, pp. 668–671, 2004.
- [6] H. Besbes and T. Le-Ngoc, “A fast adaptive predistorter for nonlinearly amplified M-QAM signals”, in Proc. IEEE Global Commun. Conf. GLOBECOM, San Francisco, CA, USA, Nov.-Dec. 2000, pp. 108–112.
- [7] P. K. Sharma, R. K. Nagaria, and T. N. Sharma, “A novel approach for power saving in OFDM system using SLM PAPR reduction technique”, IJCITAE, vol. 3, no. 1, pp. 23–26, 2009.
- [8] Y. Guo and J. R. Cavallaro, “A novel adaptive pre-distorter using LS estimation of SSPA non-linearity in mobile OFDM systems”, in Proc. IEEE Int. Symp. Circ. Sys. ISCAS, Phoenix, Arizona, USA, May 2002, pp. 453–456.
- [9] F. H. Gregorio, “Analysis & compensation of nonlinear power amplifier effects in multi antenna OFDM systems”, Ph.D. thesis, Helsinki University of Technology, Nov. 2007.
- [10] K. Wesołowski and J. Pochmara, “ Efficient algorithm for adjustment of adaptive predistorter in OFDM transmitter”, in Proc. IEEE Vehicular Technol. Conf. VTC, Boston, MA, USA, Sept. 2000, pp. 2491–2496.
- [11] R. W. Bauml, R. F. H. Fischer, and J. B. Huber, “Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping”, Electron. Lett., vol. 32, pp. 2056–2057, Oct. 1996.
- [12] J. Minkoff, “The role of AM-to-PM conversion in memory less nonlinear systems”, IEEE Trans. Commun., vol. COM-33, pp. 139–144, July. 1985.
Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-BATA-0015-0022