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UWB (Ultra-wideband) radio is a fast emerging technology with uniquely attractive features inviting major advances in wireless communications, networking, radar, imaging, and positioning systems. UWB technology is advance technology for high speed data transfer for indoor as well as outdoor communication. Paper provides the coexistence of WiMax and UWB system that work in band 3.1GHz to 10.6 GHz. The brief introduction of UWB system as well as various issues of coexistence between WiMax and UWB is described. PSD of OFDM signal is simulated using Matlab software.