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This paper demonstrates the Data aided (DA) synchronization for single user in IEEE 802.15.4a channel for coherent and Non-coherent UWB-IR receivers. Random Timing Offset before every transmitted sequence is estimated using Walsh codes which act as pilot sequence to achieve timing synchronization. Sliding correlation window of appropriate length is used to perform correlation of received bit stream and locally generated templates at receiver. Autocorrelation of Walsh code will show a peak value at an instant, this instant of peak is estimated as symbol boundary. In order to show the performance of pilot sequence, Error variance Vs SNR (dB) and its BER performance is plotted for different lengths of pilot sequences in Residential and Office environments.Index terms-Ultra-wide band Impulse radio (UWB-IR), IEEE 802.15.4a channel model (Saleh-Valenzuela model), Sliding correlation window, Walsh code, Error variance.