Abstract
In this thesis, we use unequal error protection (UEP) codes in the successive cancellation list decoding (SCLD) of polar codes. We puncture non-basis columns of the parity check matrix of an optimal UEP code to get different rates of UEP codes. UEP code can do parity check for the front part of information bits of codeword by using an eifficient encoding method. Then we use this parity check matrix of the UEP code to check paths which are valid. Simulation results show that polar codes concatenated with UEP codes generally outperform polar codes concatenated with multiple CRCs. And we also show that the saturated phenomenon of low rate case is faster than high rate case.