![]() ![]() ![]() If the transmitter were to send the next signal burst with a delay less than the delay spread, there would be smudging of some copies of the first burst with the initial copies of the second burst. Then, delay spread is defined as the difference between these two arrivals as \(\tau = t_L - t_o\).Ĭlearly, the communication system must take this time window into account to avoid mixing of two different signals. The second bound is the time of arrival of the last detectable copy of that signal. The first bound is the time at which signal arrives at the receiver following the shortest path (or the strongest path which doesn't necessarily have to be the shortest). This sets up two time bounds on the signal's arrival. So, beyond a certain point, we cannot detect the contents of the signal in the arriving copies properly. ![]() Generally, the greater the number of obstructions that a wave faces, greater is the attenuation. So, while we transmitted a single beam, what the receiver sees is something like a smudge of different copies of this master signal. Consequently, at the receiver, multiple versions of the same signal are received which, by virtue of having following different paths, may arrive at different intervals. Obstructions in the path of the transmitted waves bounce a part of it away following the laws of reflection. In this post, we explore the relationship between Delay Spread in a multipath channel and Coherence Bandwidth of that channel.In a wireless channel, no definite boundaries exist beyond which the signal cannot go. ![]()
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