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Antennas play a significant role in next generation wireless networks. The smart antenna technologies are arising in recent decade as a promising solution for future wireless systems. Especially, the steering of nulls reduces the interference of the jammer, and potentially further improves the spatial spectrum reusing. Furthermore, the adoption of the directional beam antennas advantages the signal sensitivity for the desired direction, which could benefit the system capacity. While the use of directional antennas brings the better performance and alleviates the signal fading as compared to the use of omni-directional antennas, one known disadvantage is the lack of mobility support since the narrow beamwidth of directional antennas limits the antenna's coverage area.
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