How to determine an optimal topology is extremely important during the spectrum decision procedure for a cognitive radio network. In a multi-transceiver cognitive radio network, transceivers of a cognitive user will work in a parallel mode, by which the throughput of the network can be increased. Each cognitive user working in such mode should keep electromagnetic compatible (EMC), which will increase the time-complexity of spectrum decision dramatically. In order to solve this problem, an approximate decision model with lower time complexity is given. To evaluate the reliability of the approximate model, a method for EMC probability analysis is presented, which covers co-channel/adjacent channel interference, harmonic interference and intermodulation interference. With a network scene under development, both a theoretic EMC probability and a simulated estimation value are obtained and the good consistency between both results shows that the method is practicable in engineering.

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