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This paper presents a high rate space time coded OFDM system for short range personal networking. The system uses ultra wideband (UWB) propagation to transmit MIMO space time coded signals with orthogonal frequency division multiplexing (OFDM). It can achieve good detection by integrating several pulses and high throughput by transmitting space time coded frequencies in parallel. The capacity of transmission is increased without paying more power. Also provide an analysis and design of the MIMO system in a multipath fading environment and illustrate its performance in different parameters.