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Time domain energy interleaving transmission method based on extended weighted fractional Fourier transform

A technology of fractional Fourier transform and time-domain energy, which is applied in the direction of digital transmission system, transmission system, forward error control, etc., can solve problems such as error performance, and achieve performance, energy loss reduction, and enhanced reliability.

Active Publication Date: 2020-07-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor performance of the existing communication method against channel time-domain burst errors, and propose a time-domain energy interleaving transmission method based on extended weighted fractional Fourier transform

Method used

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  • Time domain energy interleaving transmission method based on extended weighted fractional Fourier transform
  • Time domain energy interleaving transmission method based on extended weighted fractional Fourier transform
  • Time domain energy interleaving transmission method based on extended weighted fractional Fourier transform

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specific Embodiment approach 1

[0036] Specific implementation mode one: as figure 1 shown. A time-domain energy interleaving transmission method based on extended weighted fractional Fourier transform described in this embodiment, the method specifically includes the following steps:

[0037] Step 1. Perform baseband constellation mapping on the 0 and 1 bit data generated by the information source, and obtain the modulation result after constellation mapping;

[0038] Step 2. Group the modulation results obtained in step 1: starting from the first bit of the modulation result, divide the modulation result into M data blocks of equal length, and the length of each data block is 2 N , N is a positive integer, and each data block corresponds to a frame of data, where: the i'th frame data is expressed as X i′ , i'=1,2,3,...,M, M is the total number of data blocks;

[0039]Each frame data X i′ It can be expressed as x 1 、x 2 and Respectively X i′ 1st, 2nd and 2nd in N data;

[0040] Step 3: Perform ...

specific Embodiment approach 2

[0051] Specific implementation mode two: as figure 2 shown. The difference between this embodiment and the specific embodiment 1 is that in the step 3, time-domain energy interleaving is performed on each frame of data obtained in step 2, and an output signal X obtained by time-domain energy interleaving of each frame of data is obtained i′1 , X i′1 is the i′th frame data X i′ The output signal obtained through time-domain energy interleaving, the specific process is:

[0052] Step 31, performing intra-frame data grouping on each frame of data obtained in step 2;

[0053] For the i'th frame data X i′ , to x i′ Intra-frame data grouping, each group 2 1 bit, divided into 2 N-1 Group;

[0054] Express each group of data after grouping as k=1,3,5,...,2 N -1, where: is the first data in the group, It is the second data in the group;

[0055] Step 32. Data Carry out trailing zero padding to get the data after zero padding to data Carry out front zero padding...

specific Embodiment approach 3

[0065] Specific embodiment three: the difference between this embodiment and specific embodiment two is: in the step three and two, the data and Perform extended weighted fractional Fourier transform, the specific process is:

[0066]

[0067]

[0068] In the formula, X 2 for the inversion vector of X 2 'for The inverse vector of , ω 0 and ω 2 are weighting coefficients;

[0069] ω 0 and ω 2 The specific expression form is:

[0070]

[0071] Among them, θ 0 ,θ 1 ∈[0,2π) is the transformation parameter, i is the imaginary unit, and e is the natural logarithm.

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Abstract

The invention discloses a time domain energy interleaving transmission method based on extended weighted fractional Fourier transform, and belongs to the technical field of wireless communication. According to the invention, the problem of poor channel time domain burst error resisting performance of the existing communication method is solved. According to the invention, the modulated bit sequence is subjected to energy interleaving; by performing extended weighted fractional Fourier transform of different lengths on the groups for multiple times, time domain energy redistribution is realizedon the premise of ensuring that a receiving end can completely recover information data through energy de-interleaving, i.e., the energy of a single bit is dispersed to a plurality of bits participating in energy interleaving. Under the condition of a channel with a time domain burst error, fading of a single bit is shared by a plurality of bits, so that the energy loss of the single bit is greatly reduced, namely, the energy required by a receiving end for recovering bit information is reserved, and the reliability of a wireless communication system is effectively enhanced. The present invention can be applied to the technical field of wireless communications.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a time-domain energy interleaving transmission method based on extended weighted fractional Fourier transform. Background technique [0002] In wireless fading channels, errors are often bursty or bursty and random coexistence, an effective way to deal with bursty error channels is to interleave coded data, transform bursty error channels into statistically independent error channels to fully Play the role of error correction codes designed for statistically independent error channels to combat channel fading. However, the traditional bit interleaving only replaces the ordering of the bit sequence according to certain rules, and does not change the energy distribution of the signal. Distributed, but cannot disperse and compensate the bit energy affected by burst errors, and the energy of deep fading bits will be completely lost, which is very unfavorab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0071H04L1/004H04L1/0041H04L1/0045
Inventor 沙学军宋鸽房宵杰冯雨晴
Owner HARBIN INST OF TECH
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