Abstract:

Gaussian minimum shift keying+pseudo-noise (GMSK+PN) is a modulation method which achieves simultaneously transmission of GMSK data and PN. For the signal to noise ratio (SNR) estimation of GMSK+PN modulation, a fast algorithm with high accuracy and low complexity is proposed. This algorithm applies layered structure decomposition to decompose signals into a number of units. Each decomposed signal’s power is calculated or SNR is estimated. Then, signal power distribution calculation or SNR estimation is conducted successively for according units. Finally, SNR of the entire signal is calculated quickly and accurately. Estimation error is less than 0.5 dB when SNR is between 1~13 dB. Simulink simulation results verify the effectiveness of the proposed algorithm.