一种用于深空自主无线电的码速率估计算法
收稿日期: 2014-07-21
修回日期: 2014-10-13
网络出版日期: 2014-10-27
基金资助
国家"863"计划 (2012AA7014065); 新世纪优秀人才支持计划 (NCET-12-0030); 航天支撑技术基金
A symbol rate estimation algorithm for autonomous radio in deep space
Received date: 2014-07-21
Revised date: 2014-10-13
Online published: 2014-10-27
Supported by
National High-tech Research and Development Program of China (2012AA7014065); Program for New Century Excellent Talents in University (NCET-12-0030); Astronautic Supporting Technology Foundation of China
宋青平 , 刘荣科 . 一种用于深空自主无线电的码速率估计算法[J]. 航空学报, 2015 , 36(7) : 2301 -2309 . DOI: 10.7527/S1000-6893.2014.0288
The blind symbol rate estimation algorithms for autonomous radio in deep space are presented. In view of the unknown symbol starting point, an improved symbol rate estimation algorithm based on split-symbol moments estimator (SSME) is proposed according to the theoretical analysis of the estimation error. This new algorithm estimates the signal-to-noise ratio (SNR) in different ranges and selects the maximum value, which ensures the symbol rate estimation accuracy. In addition, the computational complexity of the new algorithm is compared with the conventional delay and multiply algorithm, improved delay and multiply algorithm with accumulations. The simulation results show that the proposed algorithm can effectively complete the task of symbol rate estimation at low SNR. Its symbol rate error estimation probability is lower than that of delay and multiply algorithm, and is close to that of delay and multiply algorithm with accumulations. However, the computational complexity of the new algorithm is less than 10% of that of delay and multiply algorithm with accumulations.
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