In this paper a new high data rate IR-UWB communication system is proposed. Our approach concerns two areas of applications: Multimedia communication systems and Intelligent Transportation system (ITS). This paper presents an original modulation schemes, called M-OAM (Orthogonal Amplitude Modulation) aiming to improve data rate. The main advantage of this modulation technique is its low complexity with a very high data rate. The performance of the proposed system is evaluated for different modulation schemes (MOAM) in AWGN and UWB channels. However, the system performance degraded due to the multipath effect. Thus, the contribution of S-RAKE receiver architecture in performance improvement is investigated. An other originality of this paper concerns the experimental tests performed on real conditions.