Cognitive Optimization Scheme of Coverage for Femtocell Using Multi-Element Antenna

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Recently, femtocell has been proposed as a good solution to increase the coverage area and capacity of the wireless communication system as well as meet the increasing demand for high data rate. The femtocell is low-cost, low-power and can be realized by deploying a femto-base-station connected to the core network via a wired-backhaul. Since the femtocell reuses the macrocell spectrum, co-channel interference between femtocell and macrocell should be taken into consideration first of all. The leakage of femtocell's pilot power to the outside of a residence would cause passing users' handover events and result in increasing load to the network.