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Lithium-ion batteries always suffer from serious capability decay, especially when stored at high temperature and/or for prolonged duration. In this work, electrochemical performance for Li-rich layered oxides Li1.20Mn0.54Co0.13Ni0.13O2 was systematically investigated as a function of temperature and duration. Plenty of techniques like SEM, EDS, EIS, ARC, Raman, XRD, and XPS were utilized to characterize...
To increase the data rate for transmitted reference (TR) ultra-wideband (UWB) systems, M-ary pulse position modulation (PPM) is used in this paper. The multiple-access performance of such systems is investigated in a multipath environment. A new method to derive the variance of the Gaussian random variable resulted from multiple-access interference (MAI) is developed using the power delay profile...
Transmitted reference (TR) ultra-wideband (UWB) systems have been proposed to alleviate the implementation issues of UWB Rake receivers due to channel estimation and the need for a large number of Rake fingers. However, the wideband analog delay line used in TR receivers is difficult to implement in practice as well. A slightly frequency-shifted reference (FSR) UWB system has been introduced to retain...
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