Channel estimation method used in amplification limiting orthogonal frequency division multiplexing (OFDM) system based on virtual pilot frequency

The invention provides a channel estimation method used in an amplification limiting orthogonal frequency division multiplexing (OFDM) system based on virtual pilot frequency. The channel estimation method includes the steps of: equalizing a channel using estimated initial channel information, judging and obtaining transmitted data symbols; selecting a part of or the whole data symbols as virtual pilot frequency, combining the data symbols with pilot frequency of the amplification limiting OFDM system and forming a blending pilot frequency sequence; estimating the current channel by means of the blending pilot frequency sequence again, obtaining channel response of a sub-carrier of the blending pilot frequency; feeding the channel response of the sub-carrier of the blending pilot frequency back to step one, and using the channel response as basis of next channel equalization and data symbol judgment. The channel estimation method is capable of balancing system performance requirements and computation complexi