What is a key advantage of digital modulation compared to analog modulation?

Digital modulation offers improved noise immunity, which is one of its most significant advantages over analog modulation. In digital systems, information is transmitted as discrete values or symbols, which makes the signal less susceptible to degradation from noise and interference. As a result, even in the presence of noise, the integrity of the transmitted data can be maintained better than with analog signals, which can vary continuously. Digital signals are more robust because the receiver can distinguish between the signal levels (representing the digital values) despite some level of distortion or noise.

This characteristic allows digital systems to maintain clearer communication over greater distances and under less-than-ideal conditions, making them particularly effective for modern communication methods, such as cellular networks and digital broadcasting. The advanced techniques used in digital modulation, such as error correction and signal processing, further enhance their resilience against noise.

In contrast, while higher signal amplitude, low cost of implementation, and simpler circuitry can be associated with various aspects of modulation, they do not inherently provide the same level of noise resistance and reliability that digital modulation does.