Abstract
In this paper, we have studied and analyzed some key technologies of the NCO (numerical controlled oscillator) which based on the analysis and discussion of the NCO structure in digital trunking communication system. Currently, design of baseband digital transceiver is commonly used in some typical digital trunking system. But this way has the disadvantage of low degree of software and digital, as well as less flexibility, so it’s hard to expand and upgrade the functions of the system. Broadband Zero-IF digital trunking base station can be a good solution to these problems and its structure is simpler and easier to maintain and also can reduce the system costs. In this article, the NCO is specifically designed for the broadband Zero-IF digital trunking system by using C language. And it fully adapts to the multi-carrier generation for the wideband IF with strong commonality.
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