Interference Mitigation Using Improved Spectrum Shaping TH Codes to Address Coexistence Issue in UWB Systems
Keywords:
Ultra Wide Band (UWB) System, Time Hopping (TH) Codes, Frequency Hopping (FH) CodesAbstract
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 authors provides algorithms 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 paper provides a novel and general mathematical model for improving correlation properties of
spectrum shaping code using basic code construction of known FH code family, which can be used for both
synchronous as well as asynchronous systems.
Downloads
References
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. In 2004 IEEE Wireless Communications and Networking Conference (IEEE Cat. No.
TH8733) (Vol. 2, pp. 914-919). IEEE.
Piazzo, L., & Romme, J. (2003, April). Spectrum control by means of the TH code in UWB systems. In the 57th
IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring. (Vol. 3, pp. 1649-1653). IEEE.
Journal of Graphic Era University
Vol. 8, Issue 1, 16-26, 2020
ISSN: 0975-1416 (Print), 2456-4281 (Online)
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 in Science 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. In 2016 International Conference on Emerging Trends in Communication
Technologies (ICETCT) (pp. 1-5). IEEE.
Singh, R., & Jassal, B. S. (2018). Novel method 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
