Multiple-access interference management in TH-PPM UWB systems with pulse width randomisation

A new scheme to enhance the random aspect of information symbols in Time Hopping Pulse Position Modulation is proposed to reduce the catastrophic effect of collisions in multiple access. It is evaluated through analytical expressions and simulations. Multiple access interference modeling methods have been proposed in the recent literature to carry out accurately the bit error performance of these systems. The characteristic function method has been used here to derive the analytical expressions. Monte-Carlo simulations help to confirm the accuracy of the obtained expressions. The performances of this scheme and of the classical case are compared in term of Bit-error rates. The results show that the proposed scheme is a good candidate to enhance MAI avoidance.