2 FSK/QPSK (Frequency Shift Keying/Quadrature Phase Shift Keying) Transmitter and Receiver: Design and Performance

摘要

This research considers a particular form of M-ary signaling called 2 FSK/QPSK. It is a unique way of combining two modulation methods to produce an 8-ary signaling technique whose noise performance is shown to be significantly better than 8-PSK. A transmitter and receiver for 2 FSK/QPSK is designed, built tested and analyzed. Theoretical and experimental results are compared using a plot of probability of bit error versus signal-to-noise ratio (SNR). Known theoretical performance of 8-PSK is used for comparison. Results show a 5 dB theoretical improvement in SNR and a 3 dB experimental improvement of 2 FSK/QPSK relative to 8-PSK.