Randomized decentralized “good neighbor” DSA based on adaptive antenna array interference mitigation diversity

Decentralized dynamic spectrum allocation (DSA) that exploit adaptive antenna array interference mitigation (IM) diversity at the receiver, is addressed in interference-limited environment with high level of frequency reuse. The system consists of base stations (BSs) that may belong to different providers in license-exempt spectrum, who can optimize uplink frequency allocation to their subscriber stations (SSs) to achieve the least impact of IM on the useful signal, assuming no control over band allocation of other BSs sharing the same bands. A randomized version of the recently proposed “good neighbor” IM-based DSA strategy is introduced. A possibility of significant reduction of the non-convergence probability at the cost of some controllable degradation of the convergence rate is demonstrated by means of Markov chain analysis and simulations.