This paper uses the Simulink simulation platform in MATLAB to complete the design of the binary frequency shift keying (2FSK) receiver

and simulates and verifies the system model built. The transmitting end selects the binary random sequence as the baseband signal

and generates a 2FSK modulated signal from two carriers of different frequencies; the signal then simulates the transmission process of noise interference through the additive white Gaussian noise channel. The receiving end adopts a dual-way signal processing structure. After the noisy signal is divided into two channels

it is multiplied by the corresponding local reference carrier respectively

and the integration is completed in each code element cycle. After reaching the sampling moment

the system compares the two-way integral results

determines the received code element and restores the original binary sequence accordingly. In order to grasp the judgement of the receiving end

a module for calculating the error rate is also set up in the model to count the judgement results. The simulation results show that the receiver can complete the demodulation

integration and judgement of the noisy 2FSK signal

and can restore the binary information of the transmitter

which shows that its structure and implementation method are feasible.