Power Spectral Analysis of Orthogonal Pulse-Based TH-UWB Signals

Sudhan Majhi, Paul Richardson

.

DOI: 10.4236/ijcns.2011.311114                

Abstract

The paper analyzes power spectral density (PSD) of orthogonal pulse-based signals for time hopping ultra wideband (TH-UWB) systems. Our extensive studies show that the PSD of these signals not only depends on the time dithering code and the modulation schemes, but also on the energy spectral density (ESD) of orthogonal pulses. The different order orthogonal pulses provide different ESD which changes the shape of continuous spectral component with symbols. We show that orthogonal pulse-based signals reduce the dynamic range of amplitude of discrete spectral components. Further, we reduce the dynamic range by adopting longer TH code over orthogonal pulse-based signals. As a result, UWB system performance improves with average transmitted power. The theoretical analysis of PSD of orthogonal pulse-based TH-UWB signal is provided in details and verified through simulation results.

Keywords

Time Hopping Ultra Wideband Radio, Orthogonal Pulse Modulation, Power Spectral Density

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	S. Majhi, A. S. Madhukumar and A. B. Premkumar, “Reduction of UWB Interference at NB Systems Based on a Generalized Pulse Waveform,” IEICE Electronics Express, Vol. 3, 2006, pp. 361-367.
[2]	W. Lee and S. Jitapunkul, “Orthogonal Pulse Design for UWB Systems with Timing Jitter,” International Conference on Advanced Communication Technology, Phoenix, February 2009, pp. 22-27.
[3]	A. B. P. Sudhan Majhi, A. S. Madhukumar and P. Richardson, “Combining OOK with PSM Modulation for TH-UWB Radio Systems: A Performance Analysis,” EURASIP Journal on Wireless Communications and Networking, Vol. 2008, 2008.
[4]	C. Michell, G. T. F. de Abreu and R. Kohno, “Combined Pulse Shape and Pulse Position Modulation for High Data Rate Transmission in Ultra-Wideband Communication,” International Journal of Wireless Information Networks, Vol. 10, October 2003, pp. 167-178.
[5]	S. Majhi, A. S. Madhukumar, A. B. Premkumar and F. Chin, “M-ary Signaling for Ultra Wideband Communication Systems Based on Pulse Position and Orthogonal Pulse Shape Modulation,” IEEE Wireless Communication and Networking Conference (WCNC), March 2007, pp. 2795-2799.
[6]	I. Dotlic and R. Kohno, “Design of the Family of Orthogonal and Spectrally Efficient Uwb Waveforms,” IEEE Journal of Selected Topic in Signal Processing, Vol. 1, No. 1, June 2007, pp.21-30.
[7]	Y. Chen, E. Gunawan, K. S. Low, S. Wang, Y. Kim and C. B. Soh, “Pulse Design for Time Reversal Method as Applied to Ultrawideband Microwave Breast Cancer Detection: A Two-Dimensional Analysis,” IEEE Transactions on Antennas and Propagation, Vol. 55, No.1, January 2007, pp. 194-204.
[8]	Y. Kim and F. B. Womack, “Performance Evaluation of UWB Systems Exploiting Orthonormal Pulses,” IEEE Transactions on Communications, Vol. 55, No. 5, May 2007, pp. 929-935.
[9]	J. H. Hwang, S. C. Kim, B. K. S. Yoon and J. S. Park, “Performance Analysis of PO-THMA UWB System Using Mutually Orthogonal MHP Pulses,” IEEE Transactions on Consumer Electronics, Vol. 53, No. 1, February 2007. pp. 39-45.
[10]	J. A. N. da Silva and M. L. R. de Campos, “Spectrally Efficient UWB Pulse Shaping with Application in Orthogonal PSM,” IEEE Transactions on Communications, Vol. 55, No. 2, 2007, pp. 313-322.
[11]	J. E. Padgett, J. C. Koshy and A. A. Triolo, “Physical-Layer Modeling of UWB Interference,” White Paper of Telcordia Technologies, January 2003, pp. 1-121.
[12]	S. Majhi, A. S. Madhukumar and Z. Ye, “Coexisting Narrowband and Ultra Wideband Systems: Analysis of Power Spectral Density and In-Band Interference Power,” WSEAS Transaction on Communication, Vol. 6, February 2007, pp. 118-124.