| 摘要 |
<p>PURPOSE: To maintain satisfactory communication quality by dealing with the reduction of received electric field intensity or the generation of interference wave. CONSTITUTION: Transmissive data containing preamble data are transmitted by a first communication station, the transmitted data are received by a second communication station and a preamble for synchronizing is effectively utilized for additional information transmission while using the preamble data. Two communication states are detected at least and when one communication state is detected, the preamble data are formed by a first pattern (step S12) but when the other communication state is detected, the preamble data are formed by a second pattern different from the front pattern (step S14). When the preamble data have the first pattern, the second communication station is operated corresponding to one communication state and when the preamble data have the second pattern, the communication station is operated corresponding to the other communication state.</p> |
