出版社：The Institute of Image Information and Television Engineers
摘要：A digital microwave OB link system has been developed for use in program production, such as in broadcasting and in news material transmission. The system employs multi-level digital FM modulation, which allows conventional analog equipment to be used as the digital link by adding a digital interface unit. It provides spectrum compatibility, i.e., transmission bandwidth, adjacent channel protection ratios, etc., with conventional analog systems. Therefore, it can serve in the analog-digital mixed environment during the analog-to-digital transition period. An eight-level system was developed and examined in laboratory and field tests. The results showed that the system can transmit a bit rate of 45 Mbps over a conventional microwave channel of 17 MHz bandwidth.
