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High-order multiphase digital filtering sampling method and system

A technology of digital filtering and filter coefficients, applied in digital technology networks, electrical components, impedance networks, etc., to achieve the effects of increasing operating frequency, reducing resource consumption, and reducing computing speed and computing volume

Pending Publication Date: 2022-06-10
中科南京移动通信与计算创新研究院
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Problems solved by technology

Common FIR digital filtering implementations are generally implemented in the form of multiply-accumulate (MAC). This implementation of filtering usually takes up more DSP resources. As the tap coefficient of the FIR digital filter increases, the resource consumption of the FPGA's DSP also increased
In high-speed communication systems, the digital filter will also face the problem that the rate is too high and the hardware cannot realize it.

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Embodiment Construction

[0035] According to the applicant, the problem to be solved urgently in the prior art is to reduce the filtering rate and filter resources for the broadband communication system, improve the throughput while reducing the filtering delay, and reduce the hardware resource overhead.

[0036] In order to solve the above existing problems, the applicant proposes a method for implementing high-order polyphase digital filter sampling. According to the corresponding modulation parameters and methods, the corresponding high-efficiency polyphase digital filtering implementation scheme is designed. First, the tap coefficients of the polyphase filter are divided into Q groups by using the symmetry of the filter, and then the parallel distribution algorithm is used for each group of tap coefficients. Combined with resource optimization criteria to further split, and finally perform Q-fold parallel extraction / interpolation and filtering processing on the input signal, the real-time processin...

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Abstract

The invention provides a high-order multi-phase digital filtering sampling method and system aiming at the problem that hardware cannot be realized due to the fact that the filtering rate of a broadband communication system is too high and the order of a filter is too high. The method comprises the following steps: firstly, carrying out interpolation operation on a digital signal, then carrying out multiphase decomposition on a coefficient of a filter by utilizing symmetry of the filter, then designing a split lookup table by adopting a parallel distribution algorithm, and finally, optimizing the number of stored lookup tables by utilizing symmetry of content of the lookup table. According to the implementation scheme, the storage scale of the lookup table is greatly reduced, resource consumption is reduced, the operation rate and the operation amount are effectively reduced, the working frequency of the filter is greatly improved, and the method is suitable for engineering implementation.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a high-order polyphase digital filter sampling method and system. Background technique [0002] With the development of communication systems, the requirements for broadband, high-speed, and real-time signal processing speed are getting higher and higher. In order to realize the full software processing after RF direct sampling, the efficiency of the signal processing algorithm after sampling is the key technology for realization. The structure, speed, real-time, resource consumption and performance of the processing also put forward higher requirements. [0003] The polyphase filter decomposes the transfer function H(z) of the FIR digital filter into multiple groups of different phases, and the different phase groups correspond to the extracted data after time delay, and accumulate the output results of each filter, so that it can effectively Reducing the samp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCH03H17/0226
Inventor 邓红梅王帅王飞赵健郭军平施渊籍石晶林
Owner 中科南京移动通信与计算创新研究院
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