Efficient channel hopping for blind rendezvous in multi-radio cognitive radio networks

To improve the efficiency of blind rendezvous among multi-radio asynchronous cognitive users (CUs), this paper proposes to construct a common set of CH sequences at different computational complexity for guiding the multiple radios of each CU to perform channel hopping (CH). The main advantages of this construction include its approaching to the theoretical lower bound on the time-to-rendezvous of multi-radio asynchronous CH systems closely when any two CUs have only one commonly available channel due to the interference from primary users (PUs) and its effective reduction of the same metric when no PU interference exists. Numerical simulation also shows that, compared with the existing multi-radio asynchronous CH systems, the proposed CH sequences incur a shorter rendezvous delay under different numbers of radios or rendezvous channels.