PSK Communication Signal Blind Demodulation Test

The PSK communication signal blind demodulation test program consists of multiple modules: final1_1 and final1_2 are two distinct programs implementing different PSK signal generation algorithms, final2_1 utilizes frequency domain analysis for carrier frequency pre-estimation, final2_2 employs autocorrelation techniques for symbol rate pre-estimation, final3 implements phase-locked loop (PLL) based carrier synchronization, and final4 performs timing recovery for symbol synchronization to demodulate the original signal.

In this test framework, final1_1 and final1_2 generate PSK modulated signals with different modulation schemes or parameters using digital signal processing techniques. The final2_1 module applies FFT-based spectral analysis to estimate carrier frequency, while final2_2 uses pattern recognition algorithms to pre-estimate symbol rate. Through carrier synchronization in final3 using Costas loop implementation and symbol synchronization in final4 employing Gardner timing error detection, the system successfully recovers the original transmitted data. These interconnected modules ensure accurate and stable demodulation through systematic signal processing stages.