| 摘要 |
PROBLEM TO BE SOLVED: To realize a service class by a radio circuit, efficiently accommodating a data circuit and a packet data, etc., in a digital radio relay system. SOLUTION: A system performs nonuniform modulation-demodulation for arranging each signal points nonuniformly so that roughness and density occurs between signal points in a signal space face, and enables a large difference to be made in a bit error ratio of the each type in a multi-type accommodated binary signal for a modulation signal C/N (ratio of carrier to noise power) of a multivalued modulation section and a multivalued demodulation section. The service class in the radio circuit is realized, by using a different input type of the binary signal of the multivalued modulation section used for the transmission. |
