CT#37 Noise in DSBSC receiver / figure of merit of DSBSC receiver || EC Academy

In this lecture, we will understand Noise in DSBSC receiver in a communication system.

In a Double-Sideband Suppressed Carrier (DSB-SC) receiver, noise can have a significant impact on the quality of the received signal. Noise can originate from various sources, including electronic components, the environment, and interference from other signals. Here are some key points regarding noise in a DSB-SC receiver:

1. **Thermal Noise**: One of the most common sources of noise in electronic systems is thermal noise, also known as Johnson-Nyquist noise. It is caused by the random motion of electrons within conductors and increases with temperature. In a receiver, this noise is typically present in the input stage (antenna, amplifier) and can degrade the signal-to-noise ratio (SNR).

2. **Shot Noise**: Shot noise is another fundamental noise source caused by the discrete nature of electric charge carriers (electrons). It occurs in semiconductor devices like diodes and transistors and can affect the receiver's performance.

3. **Interference**: Interference from other RF signals, such as adjacent channels or harmonics, can introduce noise into the receiver. This interference can be mitigated through proper filtering and channel selection.

4. **Amplifier Noise Figure**: The noise figure of the receiver's amplifiers is a critical parameter. Lower noise figures indicate better amplifier performance in terms of noise. High noise figures can increase the overall noise in the system.

5. **Receiver Bandwidth**: The receiver's bandwidth also plays a role. A wide bandwidth allows more noise to enter the system. Therefore, narrowing the bandwidth can help reduce noise, although it may limit the receiver's ability to capture the entire signal.

6. **SNR and Signal Quality**: Noise in a DSB-SC receiver reduces the Signal-to-Noise Ratio (SNR), which is a measure of signal quality. A lower SNR can make it more challenging to recover the original signal accurately.

To mitigate the effects of noise in a DSB-SC receiver, techniques such as signal filtering, low-noise amplifiers, and advanced modulation schemes can be employed. Additionally, proper shielding and grounding can help minimize external interference.

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