DSB-SC Costas loop by simulink

This Simulink model represents a communication system where a message signal is used to modulate a carrier signal through trigonometric processing and signal integration. The model begins with two signal sources: the message signal, which represents the information to be transmitted, and the carrier signal, which provides the high-frequency waveform required for transmission.

First, the carrier signal is passed through cosine and sine function blocks to generate two orthogonal components of the carrier. These components are then combined with the message signal using product (multiplication) blocks, allowing the message to influence the carrier waveform.

After multiplication, the resulting signals pass through transfer function blocks with the form

50

50

?

+

1

50s+1

50

​

. These blocks act as filters that smooth the signals and remove unwanted high-frequency components.

Next, the filtered signals are combined using another product block, and the result is passed to an integrator block (1/s). The integrator accumulates the signal over time to generate the phase component of the output.

The complete model demonstrates how MATLAB Simulink blocks such as trigonometric functions, transfer functions, product blocks, integrators, and summation blocks can be connected to simulate a modulation process in a communication system