COMPUTER FUNDAMENTALS

Detailed explanation-1: -Frequency selective fading occurs when the symbol length is shorter than the delay spread, or equivalently when signal bandwidth is larger than the channel bandwidth.

Detailed explanation-2: -In wireless communications, fading is the deviation of the signal attenuation affecting a certain propagation media. Discoloration may vary with time, the geographical position or frequency of the radio, which is often modeled as a random process. A fading channel is a communication channel experiencing fading.

Detailed explanation-3: -Explanation: Frequency selective fading is due to time dispersion of the transmitted symbols within the channel. Thus, the channel induces intersymbol interference (ISI). The channel have certain frequency components in the received signal spectrum that have greater gain than others.

Detailed explanation-4: -If max difference in delay spread is small compared with symbol duration of transmitted signal, channel is said to exhibit flat fading. If difference in delay spread is large compared with the symbol duration of transmitted signal, the channel exhibits frequency-selective fading.

Detailed explanation-5: -Clarification: Multipath delay spread leads to time dispersion and frequency selective fading. Doppler spread leads to frequency dispersion and time selective fading. These two propagation mechanism are independent of each other.