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The utility model discloses a wireless access control system, which comprises an indoor unit and an outdoor unit which are in communication connection by means of wireless signals. The outdoor unit comprises an IC (integrated circuit) card reader, a first voice circuit, a first control circuit...
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The communication protocols used in UAVs communication system are described as follows. The pictorial representation of UAVs communication protocols is as shown in Fig. 13. 1. MAC layer:The medium access control layer is one of two sublayers that make up data link layer. It is used to send ...
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