| 摘要 |
<p>The invention relates to a method for partially modulating the amplitude of a carrier wave, by between 8% and 14%, the carrier wave being transmitted by a wireless transceiver (10) intended to exchange data with a remote portable object wirelessly, the method consists in: a) delivering two digital radiofrequency signals Tx1 (20) and Tx2 (22); b) dephasing the second signal Tx2 by 180 degrees relative to the first signal Tx1 when there is no information to transmit (rest state); c) dephasing the two signals, Tx2 relative to Tx1 or Tx1 relative to Tx2 by an additional amount f when there is information to be transmitted (modulated state); d) passing the digital signals through a filtering and matching stage (13); and e) adding the first and the second phase-modulated filtered signals (Tx1f and Tx2f) at the antenna in order to obtain a resulting transmitted signal with a modulated amplitude.</p> |
