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이병로 진주산업대학교 1995 論文集 Vol.34 No.-
One of the subjects that interests us is the application of DSP to equipment testing. I have studied a simple DSP application to measure SINAD of a signal modulated at 1㎑. The application presented in this paper was developed on an experimental TMS320C5X Starter Kit. SINAD ratio is made using fast Fourier transform. The SINAD program consists of DSP SINAD program and PC SINAD program. DSP compute fast Fourier transform value and sends it to the PC for display. The conversion of the SINAD to dB is done in the PC. We can measure SINAD from 0.02 to 38.42 dB if we treat the input as 0 to 1 volts with HUNG CHANG sweep function generator.
전력증폭기 비선형 보상 기술을 고려한 PSA-QAM의 성능분석
이병로,임영희,이광석 진주산업대학교 1997 論文集 Vol.36 No.-
In land mobile communication, very extensive studies on pilot symbol assisted modulation(PSAM) have been made on fading compensation. This paper analyzes the effect of power amplifier nonlinearity on PSA-QAM with maximal ratio combining space diversity. First, to investigate performance limitation of PSAM, we analyze theoritical performance of QAM with MRC dirversity in given perfect information an fading. In practical PSAM, information for fading is obtained through interpolation of the pilot symbols. We employed the interpolation filter which could minimize the average power of error and analyzed effects on the system performance of the number of filter taps, period of the pilot symbol frame, and the Doppler frequency. Nonlinear power amplifiers of class AB, B, and C were incorporated in the system models and their AM / AM and AM / PM characteristics were taken into account in the performance analysis. We showed the performance variations according to the types of the nonlinear power amplifiers in the AWGN and Rayleigh fading channels using nonlinear compensation technique.
이병로 진주산업대학교 2001 산업과학기술연구소보 Vol.- No.8
In this paper we analyze two-dimensional(2D) pilot symbol assisted modulation(PSAM) for wireless orthogonal frequency division multiplex(OFDM). 2D-PSAM has been proposed for wireless OFDM by many authors. We applied the analysis of single carrier PSAM to the 2D time-frequency lattice of OFDM. We employed the interpolation fi1ter which could minimize the average power of error and analyzed effects on the system performance of the number of filter taps, period of the pilot symbol frame, and the Doppler fiequeucy in the single carrier system. Finally we analyze the performance of 2D pilot symbol assisted QAM(PSA-QAM) according to the Cyclic prefix(CP) and the Doppler frequency for OFDM in the COST207 channel model.