Design method of integrated compensation digital filter

A filter design and digital compensation technology, applied in the direction of digital technology network, impedance network, electrical components, etc., to simplify the implementation structure, enhance the versatility of the system, and reduce the design complexity.

Active Publication Date: 2018-10-09
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

This method does not dynamically adjust the data at the sampling time with the residual deviation obtained from the timing deviation, and the filtering structure is still a polynomial filter structure

Method used

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  • Design method of integrated compensation digital filter
  • Design method of integrated compensation digital filter
  • Design method of integrated compensation digital filter

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Embodiment example

[0095] Assume that the system clock f_clk=83.961MHz, the system symbol rate f_symbol1=1.573632Msps and f_symbol2=3.147264Msps, the sampling factor N=4, and the shaping factor α=0.35.

[0096] The specific steps of adopting the present invention to carry out integrated compensation digital filter design are as follows:

[0097] (1) Complete the design of filter coefficients with the help of MATLAB's FDATOOL tool:

[0098] Step 1: First, the root raised cosine filter is used as the filter mode, and the shaping coefficient is set to 0.35.

[0099] Step 2: Calculate the input sampling rate of the filter. According to the relationship between the symbol rate f_symbol1=1.573632Msps and f_symbol2=3.147264Msps of the system, and the system clock f_clk=83.961MHz, determine the value of the accurate variable rate factor P / Q to be 32 / 427 (for f_symbol1) and 64 / 427 (for f_symbol2). Choose a smaller interpolation factor Pmin=32. Then the sampling rate of the interpolated data entering...

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Abstract

The invention provides a design method of an integrated compensation digital filter. The design method comprises the following steps: step (1), designing a filter coefficient, and taking into accountthe completion of the suppression of down-conversion high-frequency components, the matching of a transmitting end shaping filter and the anti-aliasing filtering for the variable rate processing; step(2), after the filter coefficient is recombined, storing the filter coefficient, wherein the recombination method is adapted to different rates as much as possible, and the implementation of parallel calculation is easy; step (3), calculating the effective data length participating in operation and the number of data carrying out sample data recovery, and completing a corresponding filter multiplexing operation; step (4), completing compensation by utilizing residual deviation information obtained by bit timing, wherein the compensation comprises two parts: the compensation of coefficients participating in a filtering operation and the compensation of input data; and step (5), according to the adjusted coefficient and data, completing the calculation of a final filtering result by adopting a parallel and pipelined hybrid implementation mode.

Description

technical field [0001] The invention discloses a design method for an integrated compensation digital filter, which is widely used in broadband satellite communication, deep space communication, mobile communication and other communication systems, and belongs to the technical field of communication modulation and demodulation. Background technique [0002] In the past ten years, my country's aerospace industry has been in a stage of prosperity and development. Various spacecraft such as manned spacecraft, navigation satellites, relay satellites, earth observation satellites, communication satellites, deep space probes and microsatellites are increasing and developing in an all-round way. The above-mentioned spacecraft all have two kinds of channels, namely, a low-rate omnidirectional measurement and control channel and a high-speed business data channel, which respectively realize the functions of measurement and control and high-speed data transmission. The measurement an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02H03H17/04
CPCH03H17/0219H03H17/0444H03H2017/0222
Inventor 刘明洋惠腾飞张剑许静文田嘉
Owner XIAN INSTITUE OF SPACE RADIO TECH
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