In this paper, we have investigated the performance of IEEE 802.15.3a channel model with different modulation scheme. The performance parameter Average Bit Error Rate (ABER) is selected. We find out the BER performance of UWB system over the 802.15.3a indoor channel model for all channels profile CM1, CM2, CM3 and CM4 with different modulation scheme. In this paper, all modulation scheme used in UWB are included in different main categories. The major categories are synchronous and asynchronous. In synchronous mode, we again divided different modulation scheme e.g. BPSK, PPM, PAM etc into antipodal and orthogonal schemes. In the asynchronous category, we have studied about DPSK. All these modulation categories are comparing on the common platform and finally we got antipodal modulation scheme category is good for UWB in term of ABER.