Iterative carrier synchronization algorithm for BICM-ID
Hua Feng Peng · Journal of Circuits and Systems · 2013
In the system of bit-interleaved coded modulation with iterative decoding(BICM-ID),considering that the traditional carrier synchronization algorithm performs big inaccuracy for frequency and phase estimation,a code-aided iterative carrier synchronization algorithm is proposed.It is based on the expectation-maximization(EM) algorithm,as well as some improved methods are proposed.The new algorithm makes use of the soft information provided by the decoder and gets good estimate of synchronization by iteratively exchanging information between the synchronizer and the decoder.Simulations show that as long as meeting the decoder convergence condition,the estimation precision will be improved,and the system bit error rate performance can approach optimality in ideal synchronization when the iterative number reaches eight.