... estimate for every sub-block of symbols before 10−3 10−4 10−5 BER PERFORMANCE OF THE PROPOSED RECEIVER We constructed a binary LDPC code of N = 3000, K = 1500, R = 0.5 for a sub-block size of Nb ... paper, we addressed the problem of LDPC codebased iterative decoding under phase noise channels from a code perspective We proposed construction of ring-based codes for higher-order modulations ... Sridhara and T E Fuja, LDPC codes over rings for PSK modulation,” IEEE Transactions on Information Theory, vol 51, no 9, pp 3209–3220, 2005 [12] M C Davey and D MacKay, “Low-density parity check codes...