Iterative decoding algorithm in the Turbo, LDPC, Polar codes

We consider the iterative decoding of the Turbo-LDPC and Polar code. By using iterative decoding algorithm, we can get good performance and of new research programs. Turbo codes were introduced by Berrou. Polar codes were proposed by Arikan which can achieve the capacity of arbitrary symmetric binary-input channels. LDPC codes could be decoded in a similar manner to Turbo codes and polar codes, and may actually be able to beat the Turbo codes. But maybe the polar codes have a lower complexity.