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Abstract
Following FCC approval of ultra-wide band (UWB) radio rules for commercial applications in 2002, a UWB radio physical layer standard is currently under development. Although the UWB transmitting UWB band are spelled out by the FCC, neither UWB signal forms nor modulation schemes are defined by the regulations, stated in ref. [1]. This paper presents the models of two types of impulse radio UWB modulation systems and their simulation performance. They are direct sequence UWB (DS-UWB) and time hopping UWB (TH-UWB). Unique ways of modulating and positioning the impulses, as in transmitted-reference delay (TRD) modulation and pulse-position modulation (PPM) , can result in the simple UWB radio architectures. Systems of TRD for DS-UWB and PPM for TH-UWB are simulated under the same UWB working data rate and under the same AWGN (additive white Gaussian noise) channel conditions. The simulation shows that DS-TRD system presents superior performance over PPM-TH system, which is shown in the comparison chart of the paper. The simulation was verified with ideal calculated performance for DS-TRD modulation. The UWB applications are also discussed in the paper. The original manuscript of the findings in the paper is published in the conference ref. [2].
Additional information
Notes on contributors
S. Vasana
Chun-Ye/Susan Vasana received her B.S.E.E. degree from Shanghai Jiaotong University, Shanghai, China; and her M.S. degree from Tongji University, Shanghai, China. She graduated from Queen’s University, Kingston, Canada with her Ph.D. degree in electrical and computer engineering in 1994. She is currently an Associate Professor in electrical engineering at University of North Florida. Her research interests include wireless communications and digital signal processing. She had taught at Tongji University for 3 years and had worked for Motorola Inc. for 8 years. And she is the inventor of 10 US patents.
K. Phillips
Kevin Phillips received his B.S.E.E degree from University of North Florida in 2004. He is currently an Engineer at WSP Lincolne Scott in Honolulu, Hawaii. There he works as a Design Consultant simulating thermal and day lighting in buildings to optimize energy performance.