Ultra-wideband (UWB) impulse radio uses very short pulses that meet spectral mask released by Federal Communications Commission (FCC). In addition, to eliminate inter-symbol interference in the multiple-access applications, these pulses should be orthogonal. One technique to generate these pulses is shaping. The shaping is realized with bandpass filters called pulse shapers. The most popular FCC-compliant orthogonal pulses utilize prolate spheroidal wave functions. In this paper, we propose analog pulse shapers whose impulse responses approximate the prolate spheroidal pulses in the least squares sense. Furthermore, we provide their FCC-compliant transfer functions that yield highly orthogonal impulse responses.
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