Channel estimation method and device for crossing frequency division multiplexing system

The invention relates to a signal channel estimate method used in orthogonal frequency division multiplexing system, a relative device, and an orthogonal frequency division multiplexing system using said device, wherein said signal channel estimate method comprises: fixing the signal channel frequency response of sub carrier wave of at least one forward mark and the signal channel frequency response of several pilots of one data mark in one orthogonal frequency division multiplexing frame; based on said the nearby pilot of data mark, estimating the signal channel frequency response of data sub carrier wave; using said signal frequency response to correct the signal channel frequency response of said data sub carrier wave; compared with present technique, the invention can avoid noise effect and high interpolation error, to improve the system property, with low complexity.