%0 Journal Article
%T A Joint Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC Code<br>一种基于低码率LDPC码的编码与导频联合辅助载波同步算法
%A Yan Hui Tang Fa-jian Zhang Zhong-pei
%A <br>晏辉
%A 唐发建
%A 张忠培
%J 电子与信息学报
%D 2011
%I 
%X Considering that the code-aided and data-aided carrier recovery algorithms perform small synchronization range and big inaccuracy in low Signal to Noise Ratio (SNR) deep space communication systems, a joint assisted carrier synchronization algorithm with code and pilot is proposed. First a coarse synchronization algorithm with optimal pilot placement is constructed based on the sum of autocorrelation function of the pilots, whose frequency estimator can approximate Cramer-Rao Bound. The impact mechanism of pilot type on the trade-off between range and accuracy of estimation is analyzed. And then, a modified expectation maximization fine carrier synchronization is got with means of inserting pilot symbols and adding an integrator. Finally the simulations with the LDPC-Hadamard code with rate 1/12 verify that the new algorithm can increase synchronization range and improve accuracy, and achieve perfect synchronization with a certain amount of pilots at very low Signal to Noise Ratio.
%K Deep space communications
%K Carrier synchronization
%K Code-Aided (CA)
%K LDPC-Hadamard code<br>深空通信
%K 载波同步
%K 编码辅助
%K LDPC-Hadamard码
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=AD7F56F5243F24F7BF85A5D5A3F09392&yid=9377ED8094509821&vid=27746BCEEE58E9DC&iid=0B39A22176CE99FB&sid=47F7649551A37CFC&eid=FE6B7E9BDCCDBAA6&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=10