In wireless communication

this separation of channel estimation and decoding is known to be sub-optimal in traditional receivers

so we propose a receiver model for joint channel estimation and polar code decoding. According to the result of the Cyclic Redundancy Check（CRC） code in decoders

the receiver will select some hard decision information to re-encode

and feedback the codeword to the channel estimator. At this time

it means that the receiver will select some codeword bits as the pilots

and the channel estimator will estimate the channel state information based on the new pilots again. The proposed receiver model and corresponding algorithm in this paper not only reduce the resources occupied by the pilots

but also boost the estimation and decoding

which can improve the performance of frame error rate. For fast fading channel with the normalized Doppler spread of 0.02

2 dB performance improvement will be achieved when comparing with the traditional receiver.