| 摘要 |
A radio communication system including a first radio communication device and a second radio communication device. The first radio communication device transmits a first radio signal. The second radio communication device receives the first radio signal. The second radio communication device measures the signal strength of the first radio signal. The second radio communication device transmits the second radio signal containing the signal strength measurement. The first radio communication device receives the second radio signal, and performs first determination of a distance between the first and second radio communication devices based on the signal strength measurement contained in the received second radio signal.
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