Non Prior Knowledge Estimation of Modulation Index for Angle Modulation Signals
Zhaogen Zhong, Limin Zhang, WU Heng-zhou, Shutao Xia - · Procedia Engineering · 2011
In this paper, a new non prior knowledge estimator of the modulation index of angle modulated (AM) signals is proposed. It consists in estimating jointly the frequency modulation index and the phase modulation index. It is based on the observation that both the baseband modulation types have the similar time-frequency(TF) structure. The practical implementation of this estimator is described and the asymptotic behavior of the estimation error is studied. If N is the number of signaling intervals, the estimate of the modulation index is shown to converge to a non- Gaussian distribution at rate 1/N. Simulations results sustain our theoretical claims.