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Multi-carrier system anti-fading method based on fractional order C transformation

A multi-carrier system, fractional-order technology, applied in the modulation carrier system, multi-frequency code system, digital transmission system and other directions, can solve the problem that the sub-carrier cannot be recovered by the receiving end, and the carrier frequency offset is not very sensitive.

Inactive Publication Date: 2019-08-23
GUILIN UNIV OF ELECTRONIC TECH
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  • Description
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Problems solved by technology

[0004] 1. B.G Negash and Nikookar et al built a DWT-OFDM system in the wireless communication channel environment, replaced the FT in the traditional OFDM with the WT based on the haar wavelet base, and compared the DWT-OFDM system in the multipath channel with the traditional OFDM System, through comparison, compared with the traditional OFDM system, DWT-OFDM can reduce ISI and ICI in the established channel, but the information symbols of DWT-OFDM system are not distributed on other subcarriers, and cannot be transmitted at the receiving end restor

Method used

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  • Multi-carrier system anti-fading method based on fractional order C transformation
  • Multi-carrier system anti-fading method based on fractional order C transformation
  • Multi-carrier system anti-fading method based on fractional order C transformation

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Embodiment

[0035] refer to figure 1 , a method for anti-fading of a multi-carrier system based on fractional order C transform, comprising the following steps:

[0036] 1) Input data, serial-to-parallel conversion after constellation mapping: firstly generate serial binary baseband data in a multi-carrier system, and then perform binary phase-shift keying constellation mapping on the baseband data into N a block binary sequence Then the mapped data is allocated to N subcarriers through serial-to-parallel conversion, which is defined as:

[0037]

[0038] Among them, 0 L·M is an L*M diagonal zero matrix, I L is the L*L identity matrix;

[0039] 2) Add cyclic prefix and parallel-serial conversion after the inverse transform of the fractional C transform: firstly, find the optimal p value of the fractional C transform that minimizes the bit error rate performance of the multi-carrier system, that is, step selection of the transform order of the fractional C transform The number is ...

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Abstract

The invention discloses a multi-carrier system anti-fading method based on fractional order C transformation, and the method is characterized by comprising the following steps: 1) inputting data, carrying out the constellation mapping, and carrying out the serial-parallel conversion; 2) adding a cyclic prefix after inverse transformation of the fractional order C transformation, and performing parallel-serial conversion; 3) performing serial-to-parallel conversion after passing through a dual-selectivity fading channel, and removing a cyclic prefix; 4) carrying out fractional order C transformation and carrying out constellation inverse mapping after serial-parallel conversion to obtain output data; and 5) performing performance analysis. According to the method, the influence of inter-symbol interference ICI and inter-subcarrier interference ISI is reduced, the influence of the peak-to-average power ratio is reduced, and the anti-fading performance of the system is improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for anti-fading of a multi-carrier system based on fractional C transform Background technique [0002] With the development of wireless communication technology, multi-carrier is widely used in various wireless communication systems due to its high spectral efficiency and strong ability to resist multipath interference. However, in the high-speed mobile environment, the channel has multipath propagation and Doppler effect, and the wireless signal experiences frequency selective fading and time selective fading, that is, double selective fading. Under the dual selective fading channel, selective fading will lead to The inter-symbol interference ISI (Inter-Symbol-Interference) and sub-carrier interference ICI (Inter-Carrier-Interference) of the multi-carrier system seriously deteriorate the performance of the multi-carrier system. It can be seen tha...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2607H04L27/2639
Inventor 谢跃雷吴娟吕国裴刘信蒋平易国顺蒋俊正欧阳缮廖桂生
Owner GUILIN UNIV OF ELECTRONIC TECH
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