Blind Modulation-Index Estimation for Composite-Modulation Signals

Document Type

Article

Publication Date

1-1-2024

Abstract

Composite modulation (CM) has been considered the essential component in the next generation intelligent telemetry, tracking, and command (TT&C) systems. For the cognitive TT&C scenario, the CM parameters must be blindly estimated without any a priori knowledge in practice. In this article, a blind modulation-index estimation method for the CM TT&C signals is proposed. In our proposed approach, the power-level ratio between the primary carrier and the dominant secondary carrier is first measured from the frequency spectrum of the CM signal. The relationship between such a power-level ratio and the modulation-index Kp is formulated analytically. Then, a hybrid interpolation mechanism of Hermite and cubic-spline schemes is proposed to estimate the unknown modulation index Kp within a prespecified range. According to our empirical study, the CM receiver incorporated with our proposed blind modulation-index estimator can greatly reduce the bit-error rate (BER). Finally, Monte Carlo simulations are carried out to evaluate the effectiveness and superiority of our proposed blind modulation-index estimation method in terms of the normalized mean square error and the BER for a cognitive TT&C transponder using the Kp estimates generated by our proposed method.

Publication Source (Journal or Book title)

IEEE Transactions on Aerospace and Electronic Systems

First Page

7311

Last Page

7325

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