Blind Front-end Processing of Dynamic Multi-channel Wideband Signals

• Main Author: Jackson, Kevin
• Format: Others
• Published: DigitalCommons@USU 2016
• Subjects: Adaptive; Cognitive Radio; Digital Communications; Modulation; Receiver; Electrical and Computer Engineering; Signal Processing
• Online Access: https://digitalcommons.usu.edu/etd/4692; https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=5729&context=etd

In wireless digital communications, the sender and receiver typically know the modulation scheme with which they will be communicating. Automatic modulation identification is the ability to identify the modulation in a communication system with little to no prior knowledge of the modulation scheme. Many techniques for modulation identification operate on many assumptions including that the input signal is base-banded, the carrier frequency is known and that the signal is narrow-band (i.e. neighboring signals in the wide-band are excluded). This work provides the blind processing of an arbitrary wide-band signal to allow such assumptions. The challenges of such a front-end or pre-processor include detecting signals which can appear at any frequency, with any band-width at any given time and for any arbitrary duration. This work takes as its input a wide-band signal with a random number of sub-signals, each turning on and o at random times and each at random locations in the frequency domain. The output of the system is a collection of signals corresponding to each sub-signal brought down to base-band, isolated in the frequency and time domains, nominally sampled and with estimates of key parameters.