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학술지 Adaptive Compensation Method Using the Prediction Algorithm for the Doppler Frequency Shift in the LEO Mobile Satellite Communication System
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유문희, 이성팔, 한영열
ETRI Journal, v.22 no.4, pp.32-39
한국전자통신연구원 (ETRI)
00MR2300, IMT2000 위성전송 표준화 연구, 유문희
In low earth orbit (LEO) satellite communication systems, more severe phase distortion due to Doppler shift is frequently detected in the received signal than in cases of geostationary earth orbit (GEO) satellite systems or terrestrial mobile systems. Therefore, an estimation of Doppler shift would be one of the most important factors to enhance performance of LEO satellite communication system. In this paper, a new adaptive Doppler compensation scheme using location information of a user terminal and satellite, as well as a weighting factor for the reduction of prediction error is proposed. The prediction performance of the proposed scheme is simulated in terms of the prediction accuracy and the cumulative density function of the prediction error, with considering the offset variation range of the initial input parameters in LEO satellite system. The simulation results showed that the proposed adaptive compensation algorithm has the better performance accuracy than Ali's method. From the simulation results, it is concluded the adaptive compensation algorithm is the most applicable method that can be applied to LEO satellite systems of a range of altitude between 1,000 km and 2,000 km for the general error tolerance level, M = 250 Hz.
KSP 제안 키워드
50 Hz, Adaptive compensation, Compensation algorithm, Compensation method, Compensation scheme, Cumulative Density Function, Doppler Shift, Doppler compensation, Doppler frequency shift, Enhance performance, Error tolerance