Cascade integral comb filter

A cascaded integral comb and filter technology, applied in the field of communication, can solve the problems that the sampling order cannot be changed, the variable sampling rate and sampling phase cannot be dynamically controlled, and the frequency limit of input data is limited, so as to facilitate pipeline processing Process, easy to expand, and reduce the effect of processing delay

Active Publication Date: 2010-01-20
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 such as figure 2As shown, it includes an integration unit, a comb unit, and an extraction unit arranged between the integration unit and the comb unit, and a data port and a synchronization signal port respectively arranged in the integration unit, the extraction unit, and the comb unit; the The data port is used to input data data_in; the synchronization signal port is used to input the synchronization signal data_sync, and the data input by the data ports of the integration unit, the extraction unit and the comb unit is controlled by the synchronization signal.

[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 prese...

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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 Patents(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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