The power delay profile (PDP) gives the intensity of a signal received through a multipath channel as a function of time delay. The time delay is the difference in travel time between multipath arrivals. The
abscissa
In common usage, the abscissa refers to the (''x'') coordinate and the ordinate refers to the (''y'') coordinate of a standard two-dimensional graph.
The distance of a point from the y-axis, scaled with the x-axis, is called abscissa or x coo ...
is in units of time and the ordinate is usually in
decibel
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a po ...
s.
It is easily measured empirically and can be used to extract certain channel's parameters such as the
delay spread In telecommunications, the delay spread is a measure of the multipath richness of a communications channel.
In general, it can be interpreted as the difference between the time of arrival of the earliest significant multipath component (typically t ...
.
For Small Scale channel modeling, the power delay profile of the channel is found by taking the spatial average of the channel's baseband impulse response i.e.
over a local area.
Wireless Communications: Principles and Practice by Theodore S Rappaport
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References
2. 36521 section B
Radio frequency propagation
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