Cascade integral comb filter

A cascaded integration comb and filter technology, applied in the field of communication, can solve the problems of input data frequency limitation, inability to dynamically control variable sampling rate and sampling phase, inability to realize variable sampling order, etc., to reduce processing time Delay, easy pipeline processing, easy to expand the effect

Active Publication Date: 2007-06-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] Because the frequency of the input data in the prior art must be the same frequency as the main clock, there is a limit to the frequency of the input data, and the variable sampling rate and sampling phase cannot be dynamically controlled, and the variable sampling order cannot be realized.

Method used

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Embodiment Construction

[0057] For the CIC filter described in the present invention, the first embodiment provided by the present invention has a structure as shown in Figure 2, including an integration unit, a comb unit, and an extraction unit arranged between the integration unit and the comb unit, and The data port and the synchronous signal port provided in the integration unit, the extraction unit and the comb unit respectively; the data port is used to input data data_in; the synchronous signal port is used to input the synchronous signal data_sync, and through the The synchronization signal controls the data input by the data ports of the integration unit, the extraction unit and the comb unit.

[0058] In the first embodiment provided by the present invention, the synchronization signal data_sync when controlling the input data is configured as follows:

[0059] Since the synchronization signal can be input from the outside through the synchronization signal port in the present invention, the ...

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Abstract

This invention relates to a cascade integral comb filter, comprising integral module, extract module and comb module, and place inside data port and synchronous signal port; the said synchronous signal port is used for transmitting synchronous signals; the said data port is used for the data input according to synchronous signals, and control the transmitted data through the synchronous signals. Through this invention, can adopt data synchronous signal to control data input, solve the problem that the frequency of input data is restricted result from frequency of data transmitted must be the same with master clock in existing technologies, but the invention easy to implement serial processing, and can reduce the time delay in procession. In addition, the invention can also dynamically control variable sample rate and or variable sample phase through the variable counter and comparator set in extract module, thus facilitate the expansion of filter. And the invention can also dynamically control variable exponent number through the selector set in the integral module or comb module.

Description

technical field [0001] The invention relates to the communication field, in particular to a cascaded integral comb filter. Background technique [0002] In the software radio IF processing unit, the cascaded integral comb (CIC) filter extracts the high-speed digital signal output after A / D (analog-to-digital converter) conversion, and outputs a low-speed digital signal. Let p be the order of the CIC filter, and M be the decimation rate, then the transfer function of the CIC filter is: [0003] H CIC ( z ) = ( 1 - z - M 1 - z - 1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H03H17/06H03H17/02H04B7/26
Inventor 李新兵马敬兴孙全余剑
Owner HUAWEI TECH CO LTD
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