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Method and system for reducing peak-to-average power ratio of multi-user large-scale mimo-ofdm system

A technology of MIMO-OFDM and peak-to-average power ratio, which is applied in the field of reducing the peak-to-average power ratio of multi-user large-scale MIMO-OFDM systems, can solve problems such as poor reliability and complex design, to ensure reliable communication, improve reliable communication, and computing Effects with low complexity

Inactive Publication Date: 2020-01-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, these methods have not taken advantage of the characteristics of the MIMO system itself, and the design is complex and the reliability is poor.

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  • Method and system for reducing peak-to-average power ratio of multi-user large-scale mimo-ofdm system

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Embodiment Construction

[0044] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0045] The basic idea of ​​the invention is to iteratively reconstruct the signal. AX=b represents a signal transmission model, A represents a channel matrix, X represents a signal vector transmitted by a massive MIMO system base station, and b represents a signal vector received by multiple users. For a large-scale antenna system, A is a singular matrix. According to the theory of linear space, an X' with low PAPR can be found, so that AX'=b still holds. Such as figure 1 , shown in 3, a method for reducing the peak-to-average power ratio of a multi-user massive MIMO-OFDM system, which includes the following steps:

[0046] S1: First calculation, calculate the peak-to-average power ratio PAPR of the input signal matrix X x ;

[0047] S2...

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Abstract

The invention discloses a method and system for reducing the peak-to-average power ratio of a multi-user large-scale MIMO-OFDM system. The method calculates the peak-to-average power ratio of the input signal matrix, and then calculates the column vector, and uses the column vector to replace the input signal The columns of the matrix, so as to obtain a new input signal matrix, and then calculate the peak-to-average power ratio of the new input signal matrix, compare the peak-to-average power ratio of the input matrix before and after the judgment replacement, and continuously update the input signal matrix, so as to perform multiple Iterative reconstruction; the system includes a matrix column selection module, a solution vector generation module, a weighted coefficient set module, a weighted sum module, a column replacement module, a PAPR calculation module, a decision module and a signal selection module. The invention fully utilizes the characteristics of the large-scale antenna system itself, has low computational complexity, is applied in the field of wireless communication, and can improve communication reliability and reduce cost.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and system for reducing the peak-to-average power ratio of a multi-user large-scale MIMO-OFDM system. Background technique [0002] MIMO technology can double the capacity of wireless channels without increasing the transmission channel bandwidth, so it is considered to be one of the major breakthroughs in modern communication technology. As an extension of traditional MIMO technology, massive MIMO can greatly improve throughput. rate and energy efficiency, and is considered one of the key technologies of 5G. [0003] OFDM technology, as a multi-carrier digital modulation technology, uses frequency division multiplexing method to effectively use the frequency spectrum. At the same time, OFDM technology divides the channel into several orthogonal sub-channels, and the signal bandwidth on each sub-channel is smaller than the relevant bandwidth of the channel...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 朱晓东龚毅涂晓东谢军孟中楼
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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