Question

Which among the following is the impact of having poor spur free dynamic range?

(a) Difficulty in short signal detection

(b) Overloading

(c) Additive noise

(d) High complexity

I had been asked this question during an internship interview.

My question is based upon Next Generation Wireless Network in portion Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct answer is:

(b) Overloading

Explanation:

• Spur-free dynamic range (SFDR) refers to the range of input signal levels over which a system can operate without significant interference from spurious signals. In systems like radio receivers or digital signal processors, poor SFDR can lead to overloading of the system, where signals that are too strong cause distortion, making it difficult to distinguish between the desired signal and noise or interference.

• Here's a breakdown of why the other options are less relevant:

  • (a) Difficulty in short signal detection: This is more related to sensitivity and the ability to detect weak signals, which is not directly tied to SFDR.
  • (c) Additive noise: This is related to noise added during signal transmission or processing, but it's not the primary issue with poor SFDR.
  • (d) High complexity: While some systems may have higher complexity to manage a wider dynamic range, poor SFDR itself doesn't directly result in higher system complexity.

Poor SFDR leads to overloading because the system may not be able to differentiate between strong and weak signals, causing distortions that hinder proper signal detection.