| 摘要 |
In one embodiment, a method includes receiving, at a first device, a first signal transmitted from a first antenna and receiving a second signal after receiving the first signal. The second signal is transmitted from a second antenna after the first signal was transmitted from the first antenna. The method includes determining expected characteristics of an expected signal based on combining the first signal and the second signal. The method includes receiving, at the first device, a third signal comprising signals transmitted from the first antenna and the second antenna substantially simultaneously. The method includes determining whether the third signal comprises at least one characteristic that matches the expected characteristics. In response to determining that the third signal matches the expected signal, the method includes engaging, by the first device, in a communication session with a second device, the second device comprising the first antenna and the second antenna.
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