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Impact of Group Delay in RF BPF on Impulse Radio Systems  

Myoung Seong-Sik (Dept. of Electrical and Electronic Engineering, Yonsei University)
Kwon Bong-Su (Dept. of Electrical and Electronic Engineering, Yonsei University)
Kim Young-Hwan (Samsung Advanced Institute of Technology)
Yook Jong-Gwan (Dept. of Electrical and Electronic Engineering, Yonsei University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.4, 2005 , pp. 380-388 More about this Journal
Abstract
This paper presents analysis results of the effects of RF filter characteristics on the system performance of impulse radio. The impulse radio system transmits modulated pulses having very short time duration and information can be extracted in receiver side based on cross-correlation between received and transmitted pulses. Accordingly, the pulse distortion due to in-band group delay variation can cause serious system performance degradation. In general, RF bandpass filters inevitably cause group delay difference to the signal passing through the filter which is proportional to its skirt characteristic due to its resonance phenomenon. For time as well as frequency domain analysis, small signal scattering parameter $S_{21}$ and its Fourier transform are used to characterize output pulse waveform under the condition that the input and output ports are matched. The output pulse waveform of the filter is predicted based on convolution integral between input pulse and filter transfer function, and resulting BER performances in the BPM and PPM based impulse radio system are calculated.
Keywords
Impulse Radio; Filter; Group Delay; Pulse Waveform; BPM; PPM;
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