Hard Decision-Based PWM for MIMO-OFDM Radar

Omar Daoud

Communications and Electronics Engineering Department, Philadelphia University, Amman, Jordan.

DOI: 10.4236/cn.2015.71004                

Abstract

For the purpose of target localization, Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) radar has been proposed. OFDM technique has been adopted in order to a simultaneous transmission and reception of a set of multiple narrowband orthogonal signals at orthogonal frequencies. Although multi-carrier systems such as OFDM support high data rate applications, they do not only require linear amplification but also they complicate the power amplifiers design and increase power consumption. This is because of high peak-to-average power ratio (PAPR). In this work, a new proposition has been made based on the Pulse Width Modulation (PWM) to enhance the MIMO-OFDM radar systems’ performance. In order to check the proposed systems performance and its validity, a numerical analysis and a MATLAB simulation have been conducted. Nevertheless of the system characteristics and under same bandwidth occupancy and system’s specifications, the simulation results show that this work can reduce the PAPR values clearly and show capable results over the ones in the literature.

Keywords

Multiple Input Multiple Output, Orthogonal Frequency Division Multiplexing, RADAR, Peak to Average Power Ratio, Pulse Width Modulation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Nee, R. and Prasad, R. (2000) OFDM for Wireless Multimedia Communications. Artech House, Norwood.
[2]	Umali, E., Toyama, Y. and Yamao, Y. (2008) Power Spectral Analysis of the Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Amplification of OFDM Signals. IEEE Vehicular Tec-hnology Conference (VTC), Singapore, 1261-1265.
[3]	3GPP, Tech. Specif. Group Services and System Aspects Service Requirements for Evolution of the 3GPP System (Rel. 8), 3GPP TS 22.278.
[4]	Dahlman, E., et al. (2008) 3G Evolution: HSPA and LTE for Mobile Broadband. 2nd Edition, Academic Press.
[5]	Abeta, S. (2010) Toward LTE Commercial Launch and Future Plan for LTE Enhancements (LTE-Advanced). IEEE International Conference on Communication Systems (ICCS) Proceedings, Singap-ore, 146-150.
[6]	Andrews, J., Ghosh, A. and Muhamed, R. (2007) Fundamentals of WiMAX: Understanding Broadband Wireless Networking. Prentice Hall.
[7]	Jiang, T. and Yu, Y. (2008) An Overview: Peak-to-Average Power Ratio Reduction Techniques for OFDM Signals. IEEE Transaction on Broadcasting, 54, 257-268. http://dx.doi.org/10.1109/TBC.2008.915770
[8]	Saeed, A., Elbably, M. and Abdelfadeel, G. (2009) Efficient FPGA Implementation of FFT/IFFT Processor. International Journal of Circuits, Systems and Signal Processing, 3, 103-110.
[9]	Foschini, G. and Gans, M. (1998) On Limits of Wireless Communications in a Fading Environment When Using Multiple Antennas. Wireless Personal Communications, 6, 311-335. http://dx.doi.org/10.1023/A:1008889222784
[10]	Telatar, E. (1995) Capacity of Multi-Antenna Gaussian Channels’. AT & T Bell Laboratories.
[11]	Zelst, V. and Schenk, T. (2004) Implementation of a MIMO OFDM-Based Wireless LAN System. IEEE Transactions on Signal Processing, 52, 483-494. http://dx.doi.org/10.1109/TSP.2003.820989
[12]	Bekkemani, I. and Tabrkian, J. (2006) Target Detection and Localization Using MIMO Radars and Sonars. IEEE Transactions on Signal Processing, 54, 3873-3883. http://dx.doi.org/10.1109/TSP.2006.879267
[13]	Wang, Y. and Luo, Z. (2011) Optimized Iterative Clipping and Filtering for PAPR Reduction of OFDM Signals. IEEE Transactions on Communications, 59, 33-37. http://dx.doi.org/10.1109/TCOMM.2010.102910.090040
[14]	Chen, J.C. (2010) Partial Transmit Sequence for PAPR Reduction of OFDM Signals with Stochastic Optimization Techniques. IEEE Transactions on Consumer Electronics, 56, 1229-1234. http://dx.doi.org/10.1109/TCE.2010.5606251
[15]	Sohn, I. (2014) A Low Complexity PAPR Reduction Scheme for OFDM Systems via Neural Networks. IEEE Communications Letters, 18, 225-228. http://dx.doi.org/10.1109/LCOMM.2013.123113.131888
[16]	Wang, F.P., Kimball, D., Popp, J., Yang, A., Lie, D., Asbeck, P. and Larson, L. (2005) Wideband Envelope Elimination and Restoration Power Amplifier with High Efficiency Wideband Envelope Amplifier for WLAN 802.11g Applications. IEEE Microwave Symposium Digest, Long Beach, 12-17 June 2005, 645-648.
[17]	Vasca, F. and Lannelli, L. (2012) Dynamics and Control of Switched Electronic Systems: Advanced Perspectives for Modelling, Simulation and Control of Power Converters. Springer Publisher, Berlin.
[18]	Koyuncu, M., van den Bos, C. and Serdijn, W. (2000) A PWM Modulator for Wireless Infrared Communication. Proceedings of the ProRISC/IEEE Workshop on Semiconductors, Circuits, Systems and Signal Processing, Veldhoven, 30 November-1 December 2000, 351-353.
[19]	Ochiai, H. and Imai, H. (2001) On the Distribution of the Peak-to-Average Power Ratio in OFDM Signals. IEEE Transactions on Communications, 49, 282-289. http://dx.doi.org/10.1109/26.905885
[20]	Wei, S., Goeckel, D. and Kelly, P. (2010) Convergence of the Complex Envelope of Bandlimited OFDM Signals. IEEE Transactions on Information Theory, 56, 4893-4904. http://dx.doi.org/10.1109/TIT.2010.2059550
[21]	Lin, H. and Siohan, P. (2008) OFDM/OQAM with Hermitian Symmetry: Design and Performance for Baseband Communication. IEEE International Conference on Communications (ICC’ 08), Beijing, 19-23 May 2008, 652-656.