Chi-Squared Distribution Approximation for Probabilistic Energy Equalizer Implementation in Impulse-Radio UWB Receiver

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Executive Summary

Ultra-wideband Impulse Radio (IR) is considered as a promising candidate for indoor communications and wireless sensor networks, as described. Both transmitter and receiver are facing difficulties of implementation due to the technological limits. Coherent IR UWB reception based on Rake receiver is limited in number of implementable Rake fingers. An alternative is given by the Transmitter Reference (TR) method, however the electronic architecture is more complex as it needs analog delay lines and mixers. Non-coherent energy detection receiver is far less complex as a few components like shottky diodes and capacitors suffice. Nevertheless transmitting impulses at high data rate causes inter-symbol interference which could seriously decrease the performances of a simple energy detector.

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