Interference Mitigation Using Improved Spectrum Shaping TH Codes to Address Coexistence Issue in UWB Systems

  • Rajendra Singh Defence Electronics Applications Laboratory, Graphic Era Deemed to be University, Dehradun, Uttarakhand, India
  • B.S. Jassal Department of Electronics and Communication, Graphic Era Deemed to be University, Dehradun, Uttarakhand, India
Keywords: Ultra Wide Band (UWB) System, Time Hopping (TH) Codes, Frequency Hopping (FH) Codes


The power spectrum of UWB systems can be controlled by proper selection of any of the three entities pulse, modulation scheme and Time Hopping (TH) codes, or their combinations. This paper proposes algorithms to improve the correlation properties of these TH codes without changing their spectrum shaping property, so that system performance is not comprised. The earlier work of the authorsprovidesalgorithms to design TH codes with good correlation properties for spectrum shaping to create Null at a selected frequency, of multiuser UWB signals, to avoid interference to existing narrow band systems. These algorithms are presented in the form of three methods (Method I, Method II and Method III) to show correlation improvement in synchronous system first. The paperprovides a novel and general mathematical model for improving correlation properties of spectrum shapingcode using basic code construction of known FH code family, which can be used for both synchronous as well as asynchronous systems.


Download data is not yet available.


Chiani, M.,& Giorgetti, A. (2009). Coexistence between UWB and narrow-band wireless communication systems.Proceedings of the IEEE,97(2), 231-254.

Chung, J. H.,& Yang, K. (2012). New frequency-hopping sequence sets with optimal average and good maximum hamming correlations.IET Communications,6(13), 2048-2053.

Fan, P.,& Darnell, M. (1996).Sequence design for communications applications(Vol. 1). Research Studie.

Fan, P., Lee, M. H., & Peng, D. (2005). New family of hopping sequences for time/frequency-hopping CDMA systems. IEEE Transactions on Wireless Communications,4(6), 2836-2842.

Ghavami, M., Michael, L., & Kohno, R. (2007). Ultra wideband signals and systems in communication engineering. John Wiley & Sons.

Guvenc, I., & Arslan, H. (2004, March). Design and performance analysis of TH sequences for UWB-IR systems. In2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No. 04TH8733)(Vol. 2, pp. 914-919). IEEE.

Piazzo, L.,& Romme, J. (2003, April). Spectrum control by means of the TH code in UWB systems. Inthe 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring.(Vol. 3, pp. 1649-1653). IEEE.

Ren, W., Fu, F. W., & Zhou, Z. (2013). On the average partial Hamming correlation of frequency-hopping sequences.IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,96(5), 1010-1013.

Singh, R.,& Jassal, B. S. (2015, January). Spectrum nulling TH codes with improved correlation performance for multi-user UWB systems.International Journal of Enhanced Research inScience Technology and Engineering, 4(1), 1-8.

Singh, R.,& Jassal, B. S.(2016, November). Lower bounds of correlation measure for time hopping codes in UWB communication systems. In2016 International Conference on Emerging Trends in Communication Technologies (ICETCT)(pp. 1-5). IEEE.

Singh, R.,& Jassal, B. S. (2018). Novelmethod for the selection of time hopping codes for UWB communication systems.International Journal of Engineering & Technology, 7(4), 2063-2067.

Wang, J.,& Tung, W. T. (2006). Narrowband interference suppression in time-hopping impulse radio ultra-wideband communications. IEEE Transactions on Communications, 54(6), 1057-1067