A precise SNR estimation algorithm for QPSK signals
Hui Ping Zheng · Journal of China Institute of Communications · 2004
This paper has deduced a precise SNR estimation algorithm for QPSK signals by using the methods of two-order statistics, data fitting, and considering the real and imaginary components of QPSK signal respectively. Comparing with the other two existing algorithms, this algorithm solves the problem of noneffective to low SNR values and raises the estimation performance obviously; furthermore the computational complexity can be reduced to the range that we can support according to the need of practice application.