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The authors propose a selective signal combining scheme to effectively improve Bit Error Rate (BER) performance of non-coherent Ultra Wide Band (UWB) systems utilizing Binary Pulse Position Modulation (2PPM) based on impulse radio. First, to effectively combine multipath components at the non-coherent UWB receiver, the proposed scheme preserves the energies during the pulse width interval for the received UWB signals. Next, it calculates the approximate Signal-to-Noise Ratio (SNR) by comparing the difference in signal energies during the pulse width interval.
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