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For high data rate ultra wideband communication system, performance study RAKE-MMSE time domain equalization (both LE and DFE) is attempted in these paper. We focus our attention on the effects of the number of RAKE fingers and equalizer taps on the error performance. The proposed receiver combats inter-symbol interference by taking advantage of the RAKE and equalizer structure. The receiver performance is investigated using a semi analytical approach and Monte-Carlo simulation on IEEE 802.15.3a UWB channel models. We show that for a MMSE equalizer operating at low to medium SNR's, the number of Rake fingers is the dominant factor to improve system performance, while at high SNR's the number of equalizer taps plays a more significant role in reducing error rates.