Digital down converter and digital upconverter

Abstract

The invention provides a digital down converter and a digital upconverter. Intermediate-frequency signals are mixed by a first-level mixing module in the digital down converter; two paths of I / Q mixing signals are output in a two-carrier time division multiplexing mode; a first-level multi-rate conversion module and a second-level multi-rate conversion module synchronize clock frequency before extraction; and the received signals are subjected to multiple extraction and filtration in a multi-carrier time division multiplexing mode according to the synchronized clock frequency. The digital upconverter synchronizes the clock frequency before frequency interpolation; a third-level multi-rate conversion module, a fourth-level multi-rate conversion module, a second-level mixing module and a fifth-level multi-rate conversion module perform frequency interpolation and filtration on the received signals in the multi-carrier time division multiplexing mode according to the synchronized clock frequency and the received signal data rate. The converter reduces the complexity of a control signal and saves logical resources.

Description

technical field [0001] The invention relates to frequency conversion technology, in particular to a digital down converter and a digital up converter. Background technique [0002] Digital down conversion (Digital Down Convert, DDC) and digital up conversion (Digital Up Convert, DUC) are important components of digital IF design. DDC is to reduce the intermediate frequency signal to the baseband frequency after extraction and filtering; DUC is to convert the baseband signal into an intermediate frequency after interpolation and filtering. The existing FPGA-based DDC and DUC mainly include digital filters, digital mixers and numerically controlled oscillators (Numerical Control Oscillator, NCO). [0003] figure 1 It is a structural schematic diagram of an existing digital down-converter. Combine now figure 1 , the structure of the existing digital down-converter is described, specifically as follows: [0004] Existing digital down-converter includes A / D converter 10, dec...

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Problems solved by technology

[0008] like figure 2 As shown, existing digital upconverters also exist figure 1 The drawback of the digital down-converters shown is that when up-converting multi-carrier signals, the same number of digital up-converters as the number of carrier signals is required. In order to control multiple digital up-converters, not only complex control signals are required, but also It consumes more logic resources and increases the complexity of the design

[0009] To sum up, the existing digital up-converter and digital down-converter not only need complex control signals but also consume more logic resources in the process of converting multi-carrier signals; For frequency converters and digital down converters, although they are easy to control, most of their functions have been solidified, and their compatibility and flexibility are poor.

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