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The spectrum pooling concept is a resource sharing strategy, which allows a license owner to share a sporadically used part of his licensed spectrum with a renter system, until he needs it himself. In order to make such a resource sharing plausible for a license owner, the impact of this strategy on the operation of the license owner system must be kept at a minimum. This means the renter system must extract the channel allocation information (CAI) from the channel, i.e. it has to detect, which parts of the shared spectrum the owner system accesses to, in order to immediately vacate the frequency bands being required by the owner and to gain access to the frequency bands, which the owner has stopped using. In this paper we propose a method for the extraction of the CAI using a prefilter delay and multiply nonlinearity in a specific spectrum pooling scenario, where the license owner is a GSM network and the spectrum renter is an OFDM based WLAN system.