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OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation

A signal peak, distributed technology, applied in the field of communication, can solve problems such as reducing computational complexity

Active Publication Date: 2016-06-08
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and propose a method for suppressing the peak-to-average ratio of OFDM signals that can be implemented in a distributed manner, so as to reduce the computational complexity, make it not subject to the constraints of practical applications, and meet the requirements of modern wireless communication systems. need

Method used

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  • OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation
  • OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation
  • OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Embodiment 1: peak-to-average ratio suppression corresponding to the first system requirement.

[0076] Step 1, input the original OFDM symbols.

[0077] (1a) The input frequency domain symbol is c o , c o ∈ C N×1 , N is the number of subcarriers, in this example, N=64;

[0078](1b) The input time domain signal is represented by x o means that x o ∈ C lN×1 , by the vector c o The 1N-point IFFT transformation is obtained, where l is the oversampling factor, and l=4 is taken in this example.

[0079] Step 2, set initial variables.

[0080] (2a) In order to express the relationship between frequency domain symbols and time domain signals in the form of matrix multiplication, set the inverse Fourier transform rotation factor matrix A∈C lN×N ;

[0081] (2b) In order to represent various types of subcarriers in OFDM symbols, set the useful subcarrier selection matrix S∈R N×N , data subcarrier selection matrix S D ∈ R N×N , idle subcarrier selection matrix S F ∈ ...

Embodiment 2

[0097] Embodiment 2: peak-to-average ratio suppression corresponding to the second system requirement.

[0098] Step 1, input original OFDM symbols.

[0099] (1.1) The input frequency domain symbol is c o , c o ∈ C N×1 , N is the number of subcarriers, in this example, N=64;

[0100] (1.2) The input time domain signal uses x o means that x o ∈C lN×1 , by the vector c o The 1N-point IFFT transformation is obtained, where l is the oversampling factor, and l=4 is taken in this example.

[0101] Step 2, set initial variables.

[0102] (2.1) In order to express the relationship between frequency-domain symbols and time-domain signals in the form of matrix multiplication, set the inverse Fourier transform rotation factor matrix A∈C lN×N ;

[0103] (2.2) In order to represent all kinds of subcarriers in OFDM symbols, set useful subcarrier selection matrix S∈R N×N , data subcarrier selection matrix S D ∈ R N×N , idle subcarrier selection matrix S F ∈ R N×N , pilot subca...

Embodiment 3

[0119] Embodiment 3: peak-to-average ratio suppression corresponding to the third system requirement.

[0120] Step Ⅰ, input the original OFDM symbols.

[0121] Ⅰa) The input frequency domain symbol is c o , c o ∈ C N×1 , N is the number of subcarriers, in this example, N=64;

[0122] Ⅰb) The input time-domain signal is represented by x o means that x o ∈ C lN×1 , by the vector c o The 1N-point IFFT transformation is obtained, where l is the oversampling factor, and l=4 is taken in this example.

[0123] Step II, set the initial variables.

[0124]Ⅱa) In order to express the relationship between frequency-domain symbols and time-domain signals in the form of matrix multiplication, set the inverse Fourier transform rotation factor matrix A∈C lN×N ;

[0125] Ⅱb) In order to represent various types of subcarriers in OFDM symbols, set the useful subcarrier selection matrix S∈R N×N , data subcarrier selection matrix S D ∈R N×N , idle subcarrier selection matrix S F ∈R...

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Abstract

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) signal peak-to-average power ratio inhibition method based on distributed implementation, mainly solving the problem of high complexity when the current inhibition OFDM system inhibits a peak-to-average power ratio. The method comprises the following steps: setting an OFDM system peak-to-average power ratio threshold, an idle subcarrier power amplitude limiting threshold and an OFDM symbol pilot subcarrier power constraint which meet requirements of an occasion of the system, and then combining with original OFDM frequency domain symbols and relevant initial variables to establish a non-convex optimization model; then, carrying out relaxation conversion on the model and solving to obtain an expected OFDM frequency domain symbol; and at last, enabling the expected OFDM frequency domain symbol to send out via an antenna after successively undergoing IFFT, parallel-serial conversion, cyclic prefix addition, D / A conversion and radio-frequency amplification. According to the method disclosed by the invention, the OFDM signal peak-to-average power ratio is effectively inhibited; and the method has relatively low computation complexity and can be used in signal transmission of communication field.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method for suppressing the peak-to-average ratio of an OFDM signal, which can be used for signal transmission in the communication field. Background technique [0002] Orthogonal frequency division multiplexing OFDM technology has the advantages of high spectrum utilization rate, strong anti-multipath fading ability, simple implementation, etc., and has been widely used in wireless communication systems. Such as figure 1 shown. The transmitter of the original OFDM wireless system mainly includes the OFDM frequency domain signal to be sent, an inverse Fourier transform IFFT module, a serial-to-parallel transform module, a cyclic prefix adding module, a D / A digital-to-analog conversion module and a radio frequency amplification module, and is finally sent out by the antenna. However, if the above method is directly adopted, the OFDM signal may have a very high...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2614H04L27/2618
Inventor 王勇超寇辰光白晶
Owner XIDIAN UNIV
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