A digital variable-frequency system and its signal processing method

A digital down-conversion and signal processing technology, applied in transmission systems, electrical components, modulation transfer, etc., can solve the problems of fixed inverter structure, poor system flexibility, difficult programmable logic devices, etc., to simplify the extraction filter processing , Improve resource utilization, facilitate design and implementation

Active Publication Date: 2007-10-24
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

However, in today's mobile communication system, there are various communication systems, and the interface protocols of the base station are also diversified. The down converter does not provide an open interface unit with other communication product manufacturers, and it is difficult to meet the actual needs.
[0008] 3. The down-converter has a built-in fixed extractor with an extraction ratio of 2:1, and the commonly used extraction method is 1:1 or greater than 4:1. This fixed structure is difficult to meet the actual extraction processing requirements.
[0009] 4. The structure of the downconverter is fixed, and it is impossible to use time-division multiplexing resources to reduce the requirements for programmable logic devices, which makes it difficult to use programmable logic devices to realize; the flexibility of the system is very poor, and it is not suitable for use in receivers, In drive test system (drive tester), repeater and other systems

Method used

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  • A digital variable-frequency system and its signal processing method
  • A digital variable-frequency system and its signal processing method
  • A digital variable-frequency system and its signal processing method

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Embodiment

[0038] A digital down-converter as shown in Figure 1, said digital down-converter includes an input end for receiving an input signal, a mixer circuit coupled to said input end for down-converting said input signal, and a coupling to the decimation circuit of the mixer. The decimation circuit includes a fixed decimator and a variable decimator, and the decimation circuit is used to decimate the down-converted signal by a factor selected based on the characteristics of the input signal. The digital downconverter also includes a signal conditioning circuit coupled to an output of the decimation circuit, an interpolator coupled to the decimation circuit, a second mixer circuit coupled to the interpolator, the signal A conditioning circuit conditions the decimated signal, the interpolator increases the number of samples within the conditioned signal, and the second mixer circuit operates to modulate a carrier with the conditioned signal.

[0039] As shown in Figure 2, a digital d...

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Abstract

The digital down frequency conversion system comprises: an A / D and AGC control module, an open interface A / B module, a special digital intrinsic module, a mixing-frequency module, a variable-multiple extract filter module, a gain regulation module, a dc intrinsic inhibition module, a time-delay adjustment module, and a carrier power statistical module. This invention has wide application, such as RRU system, receiver, multi-carrier scheduling system, and wireless BS.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a digital down-conversion system and a signal processing method thereof. Background technique [0002] In the design of traditional mobile communication products, for each independent wireless interface or frequency band combination, a corresponding integrated circuit with special purpose or special function will be specially designed to realize it separately. The functionality has been fixed by hardware coding. In order to increase the supported working mode, working frequency band or communication system, it is necessary to redesign the system and add corresponding functional unit modules, which makes the transformation, upgrading or replacement of the system very troublesome, and the product reuse rate is very low. Greatly increased the operator's investment. [0003] With the rapid development of mobile communications, new communicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/00H04B1/16H04B1/40
Inventor 胡应添张远见
Owner COMBA TELECOM SYST CHINA LTD
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