COMPUTER FUNDAMENTALS

Detailed explanation-1: -Explanation: In fast fading channel, the channel impulse response changes rapidly within the symbol duration. Thus, the coherence time of the channel is much smaller than the symbol period of the transmitted signal.

Detailed explanation-2: -Fast fading occurs when the coherence time of the channel is small relative to the delay requirement of the application. In this case, the amplitude and phase change imposed by the channel varies considerably over the period of use.

Detailed explanation-3: -The coherence time is the time over which the channel-gain-values correlation coefficient drops below a predefined threshold. The coherence time is typically used to quantify the pace of appreciable channel changes and is important, for example, for determining handoff and resource allocation time constraints.

Detailed explanation-4: -Fast fading occurs when the rate of change of the channel characteristics is faster than the rate of change of the information data signal, and results in distortion.

Detailed explanation-5: -Selective Fading and Time Delay Spread Selective fading is due to the time-dispersive medium. When an impulse (short pulse) is sent out from the base-station antenna, due to man-made structures the reflected waves travel in different paths and arrive at the mobile-unit antenna at different times.