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| Power Spectral Density of Digital Ultra Wide-band Signals |
| Ma Xiao-hui; Zou Chuan-yun |
| Department of Telecommunications and Information Engineering, Guilin University of Electronic Technology, Guilin 541004, China |
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Abstract In this paper, a unified model of the random impulse radio signals is presented based on the characters of a variety of UWB modulation signals. The Power Spectral Density(PSD)for the signals is carried out using stochastic theory. This PSD expression is used widely, such as for various modulation forms, various multi-access forms, either binary or M-ary systems. The PSD expressions for several typical modulation signals with or without the uniformly distributed timing jitter are taken for example and analyzed in details. The results show that the timing jitter smoothes the spectrum and alleviates the interferences on other narrowband communication systems. Furthermore, the results can be used to estimate the effect of changes in various parameters on PSD of transmitted signal, without going through the detailed design procedure.
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Received: 22 December 2005
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2007, Vol. 29 
