| 摘要 |
A radio apparatus according to a TDMA/TDD system uses its own transmitter and receiver so as to perform a loopback test for checking normality of the apparatus during a period of an unassigned slot. A loopback test signal is output from its own transmitter during an unassigned transmitting slot and is received by its own receiver. The signal is temporarily stored in a memory and is read during an unassigned receiving slot. The apparatus thus performs a loopback test. Since a loopback test can be performed by use of its own transmitter and receiver during an unassigned slot, a transmitting and receiving device (tester) specifically used for a loopback test is not required. Also, a loopback test can be carried out even while normal communications are being made.
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