S.B. Makarov – Dr.Sc.(Eng.), Professor, Director of Institute of Physics, Nanotechnology and Telecommunications  of Peter The Great St. Petersburg Polytechnic University

E-mail: director@phnt.spbstu.ru

A.M. Markov – Leading Engineer, Institute of Physics, Nanotechnology and Telecommunications  of Peter The Great St. Petersburg Polytechnic University E-mail: markov@cee.spbstu.ru

The paper deals with orthogonal multifrequency signals based on the IOTA function, called IOTA-OFDM signals. The application of the IOTA-function allows to increase the spectral efficiency of multifrequency signals. In this case, there is no reduction in the BER performance in comparison with classical OFDM signals. However, IOTA-OFDM signals as well as OFDM signals have a significant peak to average power ratio (PAPR), which requires high linearity of the static modulation characteristic of a power amplifier. In order to reduce the PAPR, amplitude limitation (clipping) is applied in the paper. It is shown that the use of clipping and subsequent increase in the average power of signals allows to reduce the peak power of a transmitter amplifier by 3.7 dB while maintaining the same BER performance.

1. Markus Muck, Jean-Philippe Javaudin. Advanced OFDM Modulators considered in the IST-WINNER framework for future wireless systems // Pro-ceedings of the 14th IST Mobile and Wireless Communication Summit, Dresden. Germany. 2005.
2. 3GPP TR 25.892. 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Feasibility Study for Orthogonal Frequency Division Multiplexing (OFDM) for UTRAN enhancement (Release 6). 2004.
3. Zhou Xiao. Performance Comparison between OFDMA-IOTA and OFDM/CDMA-IOTA Systems. Master Thesis. Inha University. Korea. August 2005.
4. Krishna P. Kongara, Peter J. Smith, Stephen Mann. A Comparison of CP-OFDM with IOTA-OFDM Under Typical System Imperfections // 2008 IET Seminar on Wideband and Ultrawideband Systems and Technologies: Evaluating current Research and Development. 2008.
5. Jinfeng Du, Svante Signell. Classic OFDM Systems and Pulse Shaping OFDM/OQAM Systems // Electronic, Computer, and Software Systems, Information and Communication Technology. KTH–Royal Institute of Technology, SE-100 44 Stockholm. Sweden. 2007.
6. Bangjiang Lin, Xuan Tang, Zabih Ghassemlooy, Xi Fang, Chun Lin, Yiwei Li, Shihao Zhang. Experimental Demonstration of OFDM/OQAM Transmission for Visible Light Communications // IEEE Photonics Journal. 2016. V. 8. № 5.
7. Zav’yalov S.V., Makarov S.B. Optimizacziya formy’ ogibayushhix spektral’no-e’ffektivny’x mnogochastotny’x signalov // E’lektromagnitny’e volny’ i e’lektronny’e sistemy’. 2014. T. 19. № 7. S. 38−45.
8. Zavjalov S.V., Makarov S.B., Volvenko S.V. Nonlinear coherent detection algorithms of nonorthogonal multifrequency signals // 14th International Conference, NEW2AN/ruSMART 2014, St. Petersburg, Russia, August 27−29. 2014. Proceedings, 8638 LNCS. P. 703−713.
9. Zavjalov S.V., Makarov S.B., Volvenko S.V. Application of optimal spectral effective signals in systems with frequency division multiplexing // 14th International Conference, NEW2AN/ruSMART 2014, St. Petersburg, Russia, August 27−29. 2014. Proceedings, 8638 LNCS. P. 676−685.
10. Shatrughna Prasad Yadav, Subhash Chandra Bera. PAPR reduction using clipping and filtering technique for nonlinear communication systems // IEEE International Conference on Computing, Communication and Automation. 15−16 May 2015. P. 1220−1225.