| abstract |
The invention discloses a time-frequency joint channel estimation method and device based on compressed sensing. The method includes the steps that S1, initial estimation of channel impulse response is conducted on a current signal frame, and coarse estimation information of the channel impulse response is acquired; S2, loop restructuring of OFDM block data is conducted on the current signal frame, and the reconstructed OFDM block data are obtained; S3, compressed sensing is carried out through pilot frequency information in the reconstructed OFDM block data according to the acquired coarse estimation information of the channel impulse response in the step S1, so that precise estimation information of the channel impulse response is acquired, and the precise estimation information is used as an estimation result of the channel impulse response of the current signal frame. By means of the method, maximum multipath time delay length resistance of a block transmission system, channel estimation precision and system spectrum efficiency can be improved, and under the condition that the maximum multipath time relay exceeds guard intervals, good channel estimation performance can still be achieved. |