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This thesis focuses on improving list decoding of polar codes in terms of error correction performance (by modified polar codes and shifted-pruning scheme) and the computational/time complexity (by stepped list decoding scheme). Furthermore, we analyze the properties of PAC codes and the impact of convolutional precoding on the weight distribution of polar codes. Then, we adapt the list decoding and the list Viterbi decoding algorithms to PAC codes and analyze the error correction performance,doi:10.26180/16892479.v1 fatcat:2rnilfnnlrddldae5bs7e3p5ry