DOPPLER SPREAD ESTIMATION METHOD AND A DEVICE IN MOBILE COMMUNICATIONS NETWORKS, CAPABLE OF PROVIDING ACCURATE CHANNEL INFORMATION FOR A CHANNEL ADAPTIVE ALGORITHM OR AN ADAPTIVE MODULATION AND CODING OPERATION

摘要

PURPOSE: A Doppler spread estimation method and a device in mobile communications networks are provided to effectively detect aliasing by using Bessel function in the process of Doppler frequency estimation based on PSD(Power Spectral Density) peak detection.;CONSTITUTION: An estimation part(420) temporarily estimates a maximum Doppler frequency by using channel values sampled in a frame according to a first cycle. A judgment part(450) produces at least one correlation value among at least one channel value additionally sampled in the frame and at least one channel value sampled according to the first cycle. The judgment part judges the generation of aliasing by using the correlation value. A determination part(460) determines a final maximum Doppler frequency according to the generation of the aliasing.;COPYRIGHT KIPO 2013;[Reference numerals] (410) FFT operation part; (420) Channel estimation part; (430) Channel value sampling part; (440) PDS Doppler estimation part; (450) Aliasing judgement part; (460) Doppler determination part; (AA) Baseband receiving signal; (BB) Maximum Doppler frequency