Modulation Forensics for Wireless Digital Communications in Frequency-Selective Fading Channels
Within the past decades, the explosive development of wireless communication technologies facilitates the transmissions of all types of information over wireless medium: voice, multimedia, data with confidential content, military command and control, no matter where the receivers are. However, the broadcast nature of wireless media also allows everyone within the network to listen to others’ signal. From the national security point of view, any suspicious damaging activities should be under surveillance, and friendly signals should be securely transmitted and received, whereas hostile signals must be located, identified and jammed. Thus, it is crucial to develop a forensic scheme that is able to decode the information from the received signals only. The very first step of communication forensic detector is to determine which kind of modulation is in use, which is an intermediate step between signal detection and demodulation.
KeywordsOrthogonal Frequency Division Multiplex Fading Channel Modulation Scheme Phase Distortion Additive White Gaussian Noise Channel
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