关键词: 正交频分复用, 子载波个数, 多重信号分类, 参数估计

Abstract: Based on the introduction of an Orthogonal Frequency Division Multiplexing（OFDM） System and its basic receiving model，this paper achieves an application of Multiple Signal Classification（MUSIC） algorithm of space spectral estimation into the blind parameter estimation of this system.Experiments and simulations conducted using MATLAB are quoted to demonstrate that，even without any prior knowledge of signal-under-estimation，this algorithm is capable of effectively estimating the number of sub-carriers and IFFT points on emulated OFDM signal bearing an lower SNR and the actual 802.11a signal.

Key words: Orthogonal Frequency Division Multiplexing（OFDM）, number of sub-carriers, Multiple Signal Classification（MUSIC）, parameter estimation