An Enhanced Pulse Position Modulation (PPM) for Both IR-UWB and DCC-UWB Communication

摘要

In the present paper, an enhanced Pulse Position Modulation (PPM) technique is proposed for Ultra Wideband (UWB) communication systems based on Impulse Radio-UWB (IR-UWB) or Direct Chaotic Communication-UWB (DCC-UWB). The proposed technique is a non-coherent modulation based on using an adaptive threshold at the receiver. The basic idea consists on the use of hypothesis test, inspired from the Cell Averaging-Constant False Alarm Rate (CA-CFAR) algorithm used in Radar systems, to detect the received digital information. The simulation results show that the Bit Error Rate (BER) performance in Additive White Gaussian Noise (AWGN) channel is quite similar to the classical PPM and Chaos Based-PPM (CB-PPM) which use the maximum energy criteria to make a decision. However, in multipath environment such as indoor office LOS (Line Of Sight)/NLOS (Non Line Of Sight) and outdoor LOS/NLOS IEEE 802.15.4a channel models, the BER performance of the proposed CA-PPM outperforms those of the classical PPM and CB-PPM. The obtained results show that the proposed detection scheme opens promising perspectives and provides challenging performances for UWB communication systems.