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Almost all modern cars can be controlled remotely using a personal communicator (keyfob). However, the degree of interaction between currently available personal communicators and cars is very limited. The communication link is unidirectional and the communication range is limited to a few dozen meters. However, there are many interesting applications that could be supported if a keyfob would be able to support energy efficient bidirectional longer range communication. In this paper, the authors investigate off-the-shelf transceivers in terms of their usability for bidirectional longer range communication. The evaluation results show that existing transceivers can generally support the required communication ranges but that links tend to be very unreliable.
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