Computational Complexity and Performance of RAKE Receivers with Channel Estimation for DS-UWB
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Frequency domain equalization for single-carrier broadband wireless systems
IEEE Communications Magazine
CISST'10 Proceedings of the 4th WSEAS international conference on Circuits, systems, signal and telecommunications
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In this paper, a robust adaptive MMSE Rake-equalizer receiver scheme is presented with channel estimation that has been transmitted in Direct Sequence-Ultra Wideband (DS-UWB) system. The DS-UWB has a fine path resolution by transmitting information with ultra short pulses. The Rake receiver is known as a technique that can effectively combine paths with different delays and obtain the path diversity gain. Due to sub-nano seconds narrow pulse and the large transmission bandwidth in the systems, we therefore use equalizer to overcome the resulting ISI and a long delay spread in the characterization of the UWB channel. The proposed receiver structure reduces intense multi-path destruction and severe inter-symbol interference (ISI) by using a combined adaptive Rake and equalizer structure referred to as the MMSE (minimum mean square error) algorithm. Channel information is obtained through the use of a least mean square (LMS) adaptive algorithm on the training sequence of a preamble. The indoor environment is represented by dense multipath channel models proposed by IEEE 802.15.3a. Simulation results show that the new scheme employing the energy of a few paths to obtain better performance than the traditional maximum ratio combining (MRC) Rake receiver.