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http://dx.doi.org/10.5573/ieek.2013.50.7.003

Selective-Weighted Energy Detector(S-WED) and Synchronization algorithm for IR-UWB systems  

Ji, Sinae (Department of Electrical and Electronics Engineering, Yonsei University)
Kim, Jaeseok (Department of Electrical and Electronics Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.7, 2013 , pp. 3-9 More about this Journal
Abstract
This paper proposes a selective-weighted energy detection (S-WED) and a synchronization algorithm appropriate for it in IR-UWB system. Energy detectors that are practical in terms of implementation are employed widely for noncoherent reception in IR-UWB systems. However, they show low performance due to using the energy samples captured at symbol rate. For this reason, weighted energy detectors are developed to improve the performance of EDs. Hence, for WED, not only synchronization but also the weight coefficients are needed to be obtained prior to data detection. Meanwhile, the optimal weighting coefficients of WEDs are known to be energy values. Therefore, synchronization and the weighting coefficients can be obtained simultaneously. This paper proposes an S-WED and a simple synchronization algorithm for it in which sub-intervals having energies under a certain level are excluded in energy accumulation resulting in a simpler WED with a bit performance increase in low SNR region. The proposed algorithm is verified through simulations using the preamble symbol and channel models defined in the IEEE 802.15.4a.
Keywords
IR-UWB; Weighted Energy Detector; synchronization; perfect autocorrelation;
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