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Method and device for digital down converter and filtering extraction

A digital down-conversion and digital signal technology, applied in the fields of filter extraction and digital down-conversion, can solve the problems of high computational complexity, low computational accuracy, poor real-time performance, etc., to reduce computational complexity, reduce requirements and power consumption, and improve The effect of stability

Active Publication Date: 2010-01-06
成都市天珑科技有限公司 +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method and device for digital down-conversion and filter extraction to solve the problems of high computational complexity, poor stability, low computational precision, and poor real-time performance in the prior art

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  • Method and device for digital down converter and filtering extraction

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Embodiment Construction

[0038] The core idea of ​​the present invention is: by performing multi-phase decomposition processing on the signal, the requirements on the performance of the hardware processor and the power consumption are reduced; The output branch signal to be extracted is discarded to obtain a digital down-conversion signal, which reduces the level of the pipeline, reduces the complexity of the operation, improves the stability of the processor, and effectively improves the accuracy and real-time performance of the operation.

[0039] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0040] In order to realize the purpose of the invention of the present invention, the present invention has designed a kind of filter extraction circuit, the input and output equation of this filter extraction circuit can be written as Y (n / m)×1 =B (n / m)×j h j×j A j×n x n×1 form, where Y (n / m)×1 ...

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Abstract

The invention provides a method and a device for digital down converter and filtering extraction, belonging to the field of signal and information processing. The method comprises the following steps: receiving a middle frequency digital signal, and carrying out polyphase decomposition processing with a polyphase decomposition factor of n on the middle frequency digital signal to obtain n paths of signals subjected to the polyphase decomposition processing and output the signals; receiving n paths of signals subjected to the polyphase decomposition processing, carrying out mixed frequency processing on each path of signal subjected to the polyphase decomposition processing to obtain n paths of signals subjected to the mixed frequency processing and output the signals; and receiving n paths of signals subjected to the mixed frequency processing and carrying out filtering extraction processing on the n paths of signals subjected to the mixed frequency processing according to an extraction factor m to obtain n / m paths of digital down converter signals, wherein m, n and n / m are natural numbers which are not equal to zero, and m is more than or equal to n. The device comprises a polyphase decomposition circuit, a mixed frequency circuit and a filtering extraction circuit. The scheme reduces the operation complexity, improves the stability of the processor, and effectively improves the precision and real-time property of the operation at the same time.

Description

technical field [0001] The invention relates to the field of signal and information processing, in particular to a method and device for digital down-conversion and filter extraction. Background technique [0002] As we all know, signal and information processing technology is one of the fastest-growing disciplines in information science in recent decades, and it promotes the rapid development of wireless communication technology. How to improve the calculation accuracy and speed of signal processing has always been an important topic in this information science. The current mainstream idea is to convert analog to digital (A / D, Analog / Digital) and digital to analog (D / A, Digital / Analog) The device should be as close to the antenna as possible to construct a general hardware platform. Due to the limitation of the current hardware development level, it is still difficult to sample directly from the radio frequency. At present, the preferred solution is to digitize the analog ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16H03H17/02
Inventor 李刚
Owner 成都市天珑科技有限公司
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