Fluctuations in an established transmission in the presence of a complex environment

Three of us (D.V.S., M.R. and U.K.) would like to acknowledge a stimulating environment during the XII Brunel-Bielefeld Workshop on Random Matrix Theory and Applications held on 9{10 December 2016 at Brunel, UK, where the work along the lines presented above was initiated. Partial nancial support by Horizon 2020 the EU Research and Innovation Program under grant no. 664828 (NEMF21 [54]) is acknowledged with thanks.