This project simulates QPSK modulation signals and uses a laboratory environment to create deteriorating effects of real-world high frequency (HF) transmissions that may modify the ideal QPSK waveform. These modifications may be identifiable in order to "fingerprint" the source of the modifications. To simulate the transmission path in the real world a signal generator is used to create the QPSK I/Q signal at the HF operating frequencies and a digital sampling oscilloscope acts as a receiver and records the data for analysis. A computer with MATLAB Instrument-control Toolbox is used to generate a random-input data stream as an input to the signal generator, which modulates the RF signal. The RF signal was chosen to be at HF (5-15 MHz) and the QPSK modulation was at 9600 baud. The deterioration effects of a real-world transmitter site were chosen to be associated with the output amplifier linearity and with the transmission line condition between the transmitter and antenna.
| Identifer | oai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/2112 |
| Date | 09 1900 |
| Creators | Sun, Wei-Long. |
| Contributors | Adler, Richard W., Lebaric, Jovan E., Naval Postgraduate School (U.S.)., Information Sciences |
| Publisher | Monterey, California. Naval Postgraduate School |
| Source Sets | Naval Postgraduate School |
| Detected Language | English |
| Type | Thesis |
| Format | xiv, 62 p. : col. ill. ;, application/pdf |
| Rights | Approved for public release, distribution unlimited |
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