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基于最大似然序列估计准则,提出了3种先验信息辅助的8PSK调制信号的信噪比估计方法.与现有硬判决辅助的信噪比估计方法进行了比较,解决了现有方法在低信噪比时估计误差较大的问题.分析了3种方法在Turbo均衡系统中初始迭代以及迭代进行过程中的性能,根据不同的迭代次数,在不同的方法之间进行切换会提高信噪比的估计精度,并降低计算复杂度.新方法只需要利用很少的数据符号就能得到准确的结果,并且能适用较大的信噪比范围.
Based on the maximum likelihood sequence estimation criterion, three prior information-aided SNR estimation methods for 8PSK modulated signals are proposed, which are compared with the existing hard-decision-aided SNR estimation methods, Signal to noise ratio when the estimation error is large.This paper analyzes the performance of the three methods in the initial iteration and the iterative process in the Turbo equalization system, according to different iterations, switching between different methods will improve the signal to noise ratio The accuracy of estimation and the reduction of computational complexity.The new method can get accurate result with only a few data symbols and can adapt to a large range of signal to noise ratio.