| 摘要 |
The ultra wide band signal communication uses a high frequency carrier. This carrier is modulated with the aid of a sub-carrier, and the sub-carrier is modulated with the information which is to be transmitted. The sub-carrier has a specific frequency for a specific transmitter-receiver pair. The procedure for communication using an ultra wide band signal includes generating a high frequency carrier with a narrow frequency band, at transmission. This carrier is modulated with the aid of a sub-carrier with a modulation index at least equal to 10, and modulating the sub-carrier with the information which is to be transmitted. At reception, the carrier is demodulated to then extract the sub-carrier, and the sub-carrier is demodulated to extract the useful information. The receiver comprises a reception aerial (8), and an amplification and demodulation circuit (9,10) to discriminate the useful information within the received signal. The sub-carrier may have a sinusoidal, saw-tooth or triangular waveform. The sub-carrier has a specific frequency for a specific transmitter-receiver pair. |
