A smart card comprising: a memory for storing information; at least one transmitting or receiving antenna; and a low frequency circuit, for handling information associated with said antenna and said memory, which information is modulated at a modulation frequency of between 5 kHz and 100 kHz. Preferably the antenna is an acoustic antenna.

 
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> Use of priority-based scheduling for the optimization of latency and jitter sensitive IP flows in a wireless point to multi-point transmission system
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