Wireless Personal Area Network System becomes popular in replacing a wire technologies for short area range communication system. Technologies such as Bluetooth, Wi-Fi and ZigBee are used for this purpose but due to their low transfer data rates they are unable to handle all those applications which need high transfer rate like transfer of files which has a size in GB's. Ultra Wide Band is such a wireless promising technology which covers all these aspects by using its MBOFDM Infrastructure. MBOFDM structure supports data rate up to 0.5 Gbps by dividing the 7.5 GHz broad frequency spectrum of UWB into sub bands. Baseband portion of UWB Transmitter is modeled in this paper which proves to be helpful in the evaluation of various parameters of UWB.
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