| 摘要 |
MODEM AND METHOD FOR TRANSMITTING DATA IN A MEDIUM NOTABLY SUCH AS AIR AND WATER Method for transmitting data comprising at least the following steps: emitting packets of at least two types: pure data (long packets), acknowledgments of receipt (acknowledgment) (short packets), each packet is formed of three components: an acquisition preamble, (1) for presence detection and the joint determination of the initial 10 values of the time shift and of the frequency shift, the data proper, (2), a set of unmodulated fixed carriers (3) making it possible to permanently estimate the frequency shift. Fig. 2 |
