Li-Chung Chang

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Single carrier frequency division multiple access (SC-FDMA), which utilizes discrete Fourier transform (DFT) as a pre-coder of orthogonal frequency division multiple access (OFDMA), has been adopted as the standard for the uplink access scheme in long term evolution (LTE). The DFT pre-coder makes SC-FDMA restoring the low envelope fluctuations of(More)
The major drawback of orthogonal frequency division multiplexing (OFDM) systems is the high peak to average power ratio (PAPR), which significantly limits the power efficiency of the operating power amplifier (PA) to avoid nonlinear distortions. Many predistortion techniques have been proposed to perform PA linearization to compensate nonlinear distortions(More)
R&D professionals are the impetus behind technological innovation, and their competitiveness and capability drive the growth of a company. However, high-tech industries have a chronic shortage of such indispensable professionals. Accordingly, reducing R&D personnel turnover has become a major human resource management challenge facing innovative companies.(More)
Financial supervision means that monetary authorities have the power to supervise and manage financial institutions according to laws. Monetary authorities have this power because of the requirements of improving financial services, protecting the rights of depositors, adapting to industrial development, ensuring financial fair trade, and maintaining stable(More)
In this paper, the data predistorter with memory used to minimize total power consumption due to amplifier nonlinearity in single power mode quadrature amplitude modulation(QAM) systems is investigated. The design of the data predistorter (DP) with memory is independent of the operating optimality criterion but depends upon the operating point of amplifier(More)