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Multiphase filter, digital signal processing system and filtering method

A polyphase filter, digital signal technology, applied in the direction of digital technology network, electrical components, impedance network, etc.

Active Publication Date: 2010-06-16
ST ERICSSON SEMICON BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to improve the ability to tolerate phase distortion by ingeniously designing the phase structure of the filter, so that the filtering method designed according to the present invention can obtain better noise removal performance, and reduce the noise in interpolation filtering. In order to obtain the computational complexity of autocorrelation function and matrix inversion, etc.

Method used

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Examples

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Embodiment 1

[0054] Example 1 .The method of interpolation after IFFT

[0055] First, perform FFT on the input signal x(n) to obtain X(k);

[0056] After that, (L-1)×r zeros are inserted in the middle of X(k) to obtain the interpolated signal Y(k).

[0057] Here, the sequence length of Y(k) is L times that of X(k).

Embodiment 2

[0058] Example 2 .The way of IFFT pruning after interpolation first

[0059] First, insert L-1 zeros between every two points of the input signal x(n) to obtain the interpolated sequence, and then fill in zeros to make it an integer power of 2;

[0060] Afterwards, use the FFT pruning algorithm to transform the interpolated sequence to obtain Y(k).

[0061] Here, the Y(k) to be obtained is an interpolation signal Y(k) with (L-1)r zero points in the middle, so only r points at both ends of the signal are reserved. For the FFT pruning algorithm mentioned here, please refer to "General FFTPruning Algorithm", by Rogerio G.Alves, P.L.Osorio and M.N.S.Swamy et al. in Proc.43 rd IEEE Midwest Symp. on Circuits and Systems, Lansing MI, pp. 1192-1195, August 2000, the entire contents of which publication are hereby incorporated by reference and are hereby incorporated by reference.

[0062] Here, those skilled in the art should understand that, from the perspective of the amount of...

Embodiment 3

[0065] Example 3 .Directly use the DFT transformation matrix formula instead of obtaining the autocorrelation function r(n) through FFT.

[0066] Have

[0067] output sequence Its matrix can be expressed as:

[0068] r ( 0 ) r ( 1 ) · · · r ( N - 1 ) N × 1

[0069]

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Abstract

The invention provides a multiphase filter, a digital signal processing system and a filtering method. The digital signal processing system (100) of the invention comprises a multiphase interpolation filter (101) and an array memorizer (102), wherein the multiphase interpolation filter (101) comprises a filter factor self-adoption processing module (1001) and a filter factor matrix (1002). The multiphase filter, the digital signal processing system and the filtering method of the invention can decrease the filter power dissipation, simplify filter calculation complexity and decrease the system resource cost.

Description

technical field [0001] The invention relates to a filter, a filtering method, and a digital signal processing system containing the filter, in particular to a polyphase interpolation filter with an evenly symmetrical polyphase decomposition structure and a filtering method thereof. The filter, filtering method, and digital signal processing system provided by the present invention can be widely used in digital signal processing technical fields such as mobile communication, image processing, radar positioning, sonar signal processing, and smart antennas. Background technique [0002] Currently, in the field of digital signal processing, interpolation filtering is often used. Here, interpolation generally refers to filling data between discrete data so that the filled data can conform to a continuous function. In practical applications, for the interpolation operation of the digital signal, it is relatively simple to perform zero interpolation on the digital signal first, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/00
Inventor 唐治汛
Owner ST ERICSSON SEMICON BEIJING
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