Improving Performance of SC-UWB Systems with the Optimum SRAKE Based RAKE-DFE Receiver

Zhenyu XIAO  Li SU  Depeng JIN  Lieguang ZENG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E92-B   No.8   pp.2751-2754
Publication Date: 2009/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2751
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
UWB,  SC-UWB,  RAKE,  single carrier,  SRAKE,  

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Summary: 
Single-carrier ultra-wideband (SC-UWB) is weak due to the problem of serious inter-symbol interference (ISI), which is generated in dense multipath with a long root-mean-square (RMS) delay spread. The selective RAKE (SRAKE) based RAKE-decision feedback equalizer (RAKE-DFE) receiver is usually employed to combat ISI in practical SC-UWB systems. Considering the system complexity, however, the number of RAKE fingers is usually small. In this case, conventional RAKE-DFE receivers can hardly collect enough energy to achieve a good performance. In this paper, the optimum SRAKE based RAKE-DFE receiver was proposed as a solution. Theoretical analysis and simulations are presented. Results and conclusions show that the proposed SRAKE scheme is optimum to collect energy of multipath. Moreover, the proposed RAKE-DFE receiver outperforms conventional RAKE-DFE receiver by about 1 dB, but the complexity for them both is almost the same.