| 摘要 |
PURPOSE:To identify crosstalk from other stations when a radio wave from an opposite station is intermitted by selecting the combination of location of a check bit being an object of count in one parity check period to be made different at a radio section in the vicinity operating the same frequency. CONSTITUTION:In the figure, P is a parity bit added for parity check, O marks are check bits being objects of count and X marks are bits not being an object of count. It is supposed that a radio wave is intermitted from the opposite station at a section A, a radio wave of a section B is received with sufficient magnitude for synchronization and demodulation and then the data is restored correctly, the reception side at the section A compares parity information obtained by check bit arrangement of the B with the parity information obtained at the check bit arrangement of the A. If a transmitted signal is changed at random, an error is detected by a half parity check period. |
