I would like to learn the channel estimation of narrowband communications (i.e., not OFDM).
Do you recommend a textbook (chapter from a textbook) on this subject?
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Tse and Visvanath's "Fundamentals of Wireless Communications" is heavy on the channel and has a good appendix of estimation in additive noise. This might be what you're looking for. Generally, a good book, and free! You'll really need to read the first two chapters before delving into the third, I promise.
If you're really more heavily into the estimation theory, Steven M. Kay's "Fundamentals of Statistical Signal Processing, Volume I: Estimation Theory" is a classic, but I guess pretty much impossible to come by, if your university library doesn't have it.