Adaptive antenna array interference mitigation diversity for decentralized dynamic spectrum allocation in license-exempt spectrum

Decentralized dynamic spectrum allocation (DSA) that exploit adap- tive antenna array interface mitigation (IM) diversity at the re- ceiver, is proposed for interference-limited environments 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 subscribers sta- tions (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. The IM-based DSA algorithms based on a "good neigh- bor" decentralized DSA strategies are proposed. The new strategy introduces controllable behavior of decentralized networks, which promises a practical perspective for IM-based DSA algorithm even without guarantee of the network convergence to stationary points.