Frequency Domain MMSE Equalization with Moving FFT for MBOK DS-UWB System

In this paper, we propose a frequency domain (FD) MMSE equalizer for M-ary bi-orthogonal keying direct sequence UWB (MBOK DS-UWB) systems considered as a PHY proposal for high-speed wireless communication in IEEE 802.15.3a. The conventional FD MMSE equalization scheme has a structural limit due to insertion of the cyclic prefix (CP) in all transmit packets, but the proposed scheme is able to equalize the channel effect without CP. In order to overcome channel estimation error by multipath delay, we introduce a moving FFT and a moving average scheme. Compared with the traditional time-domain (TD) MMSE-RAKE receiver, the proposed FD MMSE equalizer has a better BER performance and we demonstrate this result by computer simulation