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In this paper, it is shown how a large mode-stirred reverberating chamber can be used to physically generate a set of non-line-of-sight propagation channels, which are naturally and objectively classified by means of the bit error rate (BER) norm. The experiments are accomplished at the mode-stirred reverberating chamber of the Universita di Napoli Parthenope (formerly Istituto Universitario Navale), and the electromagnetic input signal is a global system for mobile communications, one at 1.8 GHz. It is shown that it is possible to change the BER by means of the stirring process and/or the chamber loading. The proposed technique calls for fast measurements, and therefore, it is amenable to industrial use. The methodology is general and suitable to any digital electromagnetic signal, provided no distortion of modulation occurs.