| 摘要 |
In a wireless LAN packet communication system for each successfully received packet the strength of the received signal is measured at a target node (6) by monitoring an A/D converted RSSI signal (A). A record of minimum strength among successfully received packets is maintained at the target node (6). For each successfully received packet the difference between the signal strength of the packet and the recorded minimum is calculated at the target node (6) and sent over the link to the source node (4) as a quantitative difference indicator (F). The source node (4) maintains a moving average of difference indicators received over time and adjusts the transmitter power level (J, K) so as to maintain the moving average at a preselected link margin threshold level. Alternatively, the calculation of a desired source node power level change is performed at the target node (6) and transmitted to the source node (4).
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