A Comparision Study of Time Domain Equalization Technique Using Ultrawide Band Receivers Performance for High Data Rate Wpan System

For high data rate ultra wideband communication system, performance comparison of Rake, MMSE and Rake-MMSE receivers is attempted in this paper. We have taken into account of impact of all the parameters such as the effect of the number of Rake fingers and equalizer taps on the error performance by combating ISI are the major focus of our research. The bit error rate performances are investigated using semi analytical approach and Monte-Carlo simulation on IEEE 802.15.3a UWB channel models. A detail study on UWB channel model (IEEE 802.15.3a) is carried out using four channel models CM1CM4. Simulation results show that the bit error rate probability of rake-mmse receiver is much better than Rake receiver and MMSE equalizer. Within the distance 0 to 4 meter Rake-MMSE performs better in CM1 (LOS) channel model than that of CM2 (NLOS) channel model. Further the simulation results on non-line of sight indoor channel models illustrate bit error rate performance of Rake-MMSE improves for CM3 model with smaller spread compared to CM4 channel model. 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.