| 摘要 |
<p>A radiotelephone system using portable radiotelephones utilizes two antennas but only one receiver section. A terminal station transmits the same preamble signal in at least two time slots of a frame period of a time division sequence using the antenna (20 or 21) receiving the strongest preamble signal from the portable station in the immediately prior frame period followed by a binary message signal using the same antenna. The portable station receives each of the preamble transmissions from the terminal station via both of differently oriented antennas (50, 51) and determines which antenna received the strongest signal. The message signal from the terminal station is then received via the antenna of the portable station having received the strongest signal, the portable station also sends its response message signal on that antenna during a separate time slot of a frame period. </p> |
