| 摘要 |
PURPOSE:To decide whether or not a received burst wave is a superimposing signal of >2 burst waves by arranging an identification code block before and after the information desired for transmission, calculating the error rate of the identification code block before and after by the reception side so as to evaluate the reliability of the result of decoded information. CONSTITUTION:Burst waves B2, B3 comprising a front identification code block, an information block and a rear identification code block are sent respectively from slave stations 2, 3. A burst wave received by a master station 1 is inputted to a demodulator 12, decoded by a decoder 13 and stored in an information storage circuit 14. Then the burst wave decoded by the decoder 13 is given to the front identification code extraction circuit 15 and the rear identification code extraction circuit 16, where the front identification code and the rear identification code are extracted, and they are inputted to an identification code discriminator 18. The identification code discriminator 18 compares them with the front reference code obtained from a reference code table 19 and a rear reference code in pairs thereto so as to calculate the error rate of the front identification code and the rear identification code, and only when both the error rates of the front/rear identification codes are low, a transmission instruction is sent to an information sending control circuit 17.
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