1. A method of evaluating a code which is orthogonal to one or more further codes, comprising the steps of: receiving an access control signal on a first channel, which carries access control information and a code containing a sequence of code symbols, in response to an access request signal; calculating at least one channel estimate from information transmitted on a second different channel using a code symbol at a particular symbol instant; determining for the code symbol a compensation value taking into account the at least one channel estimate; restoring a previous power relationship among the individual code symbols contained in the code by compensating each code symbol using the compensation value determined for the corresponding symbol instant; and evaluating the code on the basis of the sequence of compensated code symbols exploiting the orthogonality to the further codes.