Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Limits on communications in a cognitive radio channel
IEEE Communications Magazine
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A secondary transmitter trying to make use of the spectrum assigned to a broadcasting service needs to be carefully planned so as to avoid interfering the primary receivers. In particular, the overlay cognitive radio paradigm postulates the use of a fraction of the secondary transmitter power to reinforce the primary signal, thus compensating for the degradation coming from the remainder of the secondary signal. Given that performance is not simply a function of the signal to noise ratio, we will analyze how to properly modify transmission strategies to avoid potential degradations in the primary service. As a study case the paper will focus on DVB-T single frequency networks, widely used in many countries worldwide for digital television broadcasting.