On the interaction of adaptive filtering, identification, and control

The aim of the article is to add to the evidence of the need for interaction between the two field of (i) signal processing and (ii) control and estimation. The focus in on the the interaction specialities from (i), i.e., adaptive filtering, and (ii)i.e., adaptive identification and control. For evidence, three basic communication systems applications of adaptive filtering are used to evoke system identification (and adaptive control) style problems amenable to analytical tools. The applications raise a number of unresolved issues that challenge existing theory. The connections drawn to adaptive identification and control problems (and relevant analytical tools) suggest approaches to these challenges.>