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pcm data roll-off filter processing method

A filter processing and roll-off technology, which is applied in digital technology networks, electrical components, impedance networks, etc., can solve problems such as occupancy, FPGA data processing platform generalization design troubles, and multiple computing resources, so as to simplify the calculation process and shorten the processing time. cycle, effect of reducing occupancy

Active Publication Date: 2022-04-19
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different data processing clock frequency requirements have caused great troubles to the general design of FPGA data processing platforms
[0007] 2. The roll-off filter requires a lot of multiplication and addition operations, which takes up more computing resources

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1, the design idea adopted by the PCM data roll-off filtering processing method is as follows:

[0048] The baseband data pulse train is represented by the following formula,

[0049]

[0050] Among them, δ(t) is the impact function, d n For baseband data, the value is +1 or -1, T b is the symbol period;

[0051] For the roll-off filter processing of baseband data, as shown in the following formula, it is obtained by multiplying the baseband data pulse sequence and the convolution of the roll-off filter impulse response function h(t),

[0052]

[0053] According to the nature of the shock function, δ(t-t 0 )*h(t)=h(t-t 0 ), then the above formula (3.2) can be simplified as,

[0054]

[0055] In the above formulas 3.2 to 3.3, r(t) is the baseband data after the roll-off filter, and h(t) is the impulse response function of the roll-off filter.

[0056] It can be seen from Equation 3.3 that the baseband data after the roll-off filter can be consid...

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Abstract

The PCM data roll-off filtering processing method of the present invention adopts the time-domain superposition calculation according to the time value of the impulse response function to perform the roll-off filtering processing, thereby reducing the technical requirements for the general design of the FPGA data processing platform, and reducing the need for a small amount of The design purpose of the addition operation is to reduce the occupation of computing resources and shorten the data processing time. It includes the following implementation steps: step 1, time-domain discretization of impulse response function h(t); step 2, baseband data and natural impulse function sequence conversion; step 3, time-domain waveform fitting; step 4, time-domain superposition calculation, according to For the equivalent moments of several data symbols before or after the current moment, the roll-off filtering impulse response function is sampled, and the effects of all data symbols are superimposed and calculated.

Description

technical field [0001] The invention relates to a PCM data roll-off filtering processing method realized based on an FPGA hardware architecture, and belongs to the field of wireless communication. Background technique [0002] Before the wireless communication system modulates and sends the baseband data signal, in order to effectively use the frequency spectrum and prevent intersymbol interference, the baseband data is generally subjected to roll-off filtering. [0003] Especially for the use of FPGA as the data processing hardware platform, based on the simplicity of the hardware architecture, the existing roll-off filter adopts an integer multiple interpolation filtering method, such as the previously disclosed patent CN201610596082.X, the processing process includes: (1) Use a high-speed clock with an integer multiple of the baseband data rate N to perform high-magnification sampling on the baseband data, and fill the sampled data with zeros, that is, the first point is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
CPCH03H17/0211
Inventor 童亚钦邵飞康峰源张伟李汶芯
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH