Wireless packet communication system, has field strength detector, control circuit, counter, memory and computer determining time for which receiving field strength is held continuous by threshold value

摘要

The system has a computer (7) and a monitor (8) for determining a threshold value of a receiving field strength with which a frame is correctly received. A field strength detector (21), a control circuit (24), a counter (26), a memory (27) and the computer determine time for which the receiving field strength is held continuous by the threshold value. The computer determines a frame length based on the time for which the receiving field strength is held continuous by the threshold value. The computer and the monitor determine an incorrect byte or incorrect bits.