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Directional antennas in sensor networks are receiving increasing interest and research due to the potential to increase throughput and reduce delay and interference, while requiring lower transmission power. Considering the stringent operation requirements (low duty-cycle) as MAC congestion problems in large multi-hop networks, WSN performance can benefit enormously from such directional capabilities together with an intelligent design. This paper investigates the introduction of switched beam directional antennas in sensor networks using a synchronised sleep/awake contention-base MAC (DirC-MAC) and real available hardware solutions.
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