| 摘要 |
<p>A communication system including at least one transmitter (15, 16)arranged to transmit signals to at least one receiver (18) and at least one repeater (19) for receiving and retransmitting said signals, wherein the signals comprise data words or parts of data words each represented by a particular frequency or combination offrequencies, and the transmitter is arranged to transmit the signals in successive spaced data bursts, in which each data burst represents the same data word or part of a data word throughout its period.</p> |
