Briefly explain the concept of frequency selective and time selective fading. For a small scale fading channel, the rms delay spread is seen to be $0.01 \mu \mathrm{~s}$ and Doppler frequency spread is 400 Hz . Find the range of values of bit rate for which the signal experience flat and slow fading. Justify your answer. ( $10 \times 4=40$ Marks) Answer any two questions from each module. Each question carries 10 marks.
Explanation
The rms delay spread of $0.01 \mu \mathrm{~s}$ indicates that the channel has a bandwidth of 100 kHz. The Doppler frequency spread of 400 Hz indicates that the channel has a coherence time of 2.5 ms. For flat fading, the bit rate should be less than the channel bandwidth, i.e., 40 kHz. For slow fading, the bit rate should be less than the channel coherence time, i.e., 800 Hz.
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