Coherence Bandwidth and Coherence Time

This page on Coherence Badwidth vs Coherence time describes difference between Coherence Bandwidth and Coherence Time.

Coherence Bandwidth

Bandwidth (range of frequencies) over which channel is constant is called coherence Bandwidth.

Coherence Bandwidth ~ (1/Maximum Delay Spread)

The better way to calculate coherence bandwidth is using RMS Delay Spread, as different channel will experience different signal intensity over different delay span with same delay spread.

Coherence Time

Time over which channel is constant is called coherence time.

RF and Wireless Terminologies