MATLAB Implementation of FSK Modulation and Demodulation with Two Detection Methods

The text discusses FSK modulation and demodulation, which employs two primary detection methods: coherent detection and non-coherent detection. Coherent detection recovers original information by comparing received signals with reference carriers, requiring precise phase and frequency synchronization between transmitter and receiver. In MATLAB implementation, this typically involves correlation operations using synchronized oscillators and phase-locked loops (PLLs). Non-coherent detection eliminates the need for transmitter-receiver synchronization by employing energy detection and frequency decision circuits. Code implementation often utilizes envelope detectors, filters, and threshold comparators. The selection between these methods depends on specific communication system requirements, with coherent detection offering better noise performance at the cost of complex synchronization circuitry, while non-coherent detection provides simpler implementation with moderate performance degradation.