The approval of the new mobile WiMAX helps in realizing the real time wireless broadband networks with large coverage area and high data rate. In mobile WiMAX whenever a subscriber comes into the cell radius of base station (BS), it has to get synchronized; this process in mobile WiMAX is termed as initial ranging. This paper proposes a novel Multiuser Detection for uplink mobile WiMAX with better timing offset estimation and reduces the multiple access interference (MAI) at the base station. © 2005 - 2012 JATIT & LLS.