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INTRODUCTION Orthogonal frequency division multiplexing(OFDM) is generally known as an effective techniquefor high data rates and has been adopted by standardssuch as Digital Audio and Video Broadcasting (DABand DVB) (ETSI, 1994; 1997). OFDM is robustagainst frequency selectivity of a multipath channeland the single-tap equalization can be used to detectthe transmitted symbols if frequency-selective fadingchannels are known. Although, the use of pilot tonesis the most robust way … 相似文献
152.
Time series prediction has been successfully used in several application areas, such as meteorological forecasting, market
prediction, network traffic forecasting, etc., and a number of techniques have been developed for modeling and predicting
time series. In the traditional exponential smoothing method, a fixed weight is assigned to data history, and the trend changes
of time series are ignored. In this paper, an uncertainty reasoning method, based on cloud model, is employed in time series
prediction, which uses cloud logic controller to adjust the smoothing coefficient of the simple exponential smoothing method
dynamically to fit the current trend of the time series. The validity of this solution was proved by experiments on various
data sets.
Project (No. 2001AA112030) supported by the National Hi-Tech Development Program (863) of China 相似文献
153.