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针对深空自主无线电的码速率盲估计问题,在码元起始位置未知的情况下,通过对估计误差的理论分析,提出一种改进的基于分离符号矩估计(SSME)的码速率估计算法,设计分区估计信噪比(SNR)并进行比较选大的方法,以保证码速率估计的精度。同时对该算法的计算复杂度进行定量分析,并与传统单次延迟相乘法、改进的多次累加延迟相乘法进行比较。仿真结果表明,本文算法能够有效完成低SNR条件下的码速率估计,其误估计概率明显优于单次延迟相乘法,与多次累加延迟相乘法相当,但计算复杂度不到多次累加延迟相乘法的10%。
Aiming at blind rate estimation of deep space autonomous radio, an improved symbol rate estimation algorithm based on discrete symbol moment estimation (SSME) is proposed by theoretical analysis of estimation error, Design partition to estimate signal-to-noise ratio (SNR) and compare the selected method to ensure the accuracy of code rate estimation. At the same time, the computational complexity of the algorithm is quantitatively analyzed, and compared with the traditional one-time delay multiplication method and the improved multiple cumulative delay multiplication method. The simulation results show that the proposed algorithm can effectively estimate the code rate under low SNR, and its probability of misjudgment is significantly better than that of single delay multiplication, which is equivalent to the multiple additive delay multiplication method, but the computational complexity is less than several times Add up 10% of the delay multiplication method.