Question

Which among the following is an approach that can be applied to overcome the effect of channel fading?

(a) Discarding particular channel from use

(b) Transmission and reception during fixed time slots

(c) Selection of appropriate waveform

(d) Compromising quality of service

I have been asked this question in class test.

The above asked question is from Next Generation Wireless Network topic in section Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct answer is:

(c) Selection of appropriate waveform

Channel fading is a significant challenge in wireless communication, especially in environments like cognitive radio. One effective approach to mitigate the effects of fading is to choose an appropriate waveform. Different waveforms have varying resistance to fading, interference, and other impairments. For example, using spread spectrum techniques like Direct Sequence Spread Spectrum (DSSS) or Frequency Hopping Spread Spectrum (FHSS) can help combat fading by spreading the signal across a wider frequency range, reducing the likelihood of signal degradation due to fading at any single frequency.

While the other options (discarding channels, fixed time slots, or compromising QoS) may be strategies in some contexts, selecting the appropriate waveform is directly related to overcoming fading effects.