COMPUTER FUNDAMENTALS

Detailed explanation-1: -➨In flat fading, BW of signal is less than the BW of channel where as in frequency selective fading, BW of signal is greater than BW of channel. ➨In flat fading, delay spread is less than symbol period where as in frequency selective fading, delay spread is greater than symbol period.

Detailed explanation-2: -In flat fading, the coherence bandwidth of the channel is larger than the bandwidth of the signal. Therefore, all frequency components of the signal will experience the same magnitude of fading. In frequency-selective fading, the coherence bandwidth of the channel is smaller than the bandwidth of the signal.

Detailed explanation-3: -For the case of a flat fading channel, the signals at the two receivers may be described as(2.45)ra(t)=s(t)+a(t), rb(t)=ms(t+)+b(t), where again m is a random complex-valued gain, and now corresponds to the time difference with which the signal arrived at each of the two receivers.

Detailed explanation-4: -1. A type of small scale fading where all frequency signal components experience the same magnitude of fading; corresponds to the case where the signal bandwidth is smaller than the channel coherence bandwidth.

Detailed explanation-5: -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.