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Method of reducing multi-antenna papr based on precoding and mimo system

A precoding, multi-antenna technology, applied in the field of methods and MIMO systems, can solve problems such as affecting system performance, and achieve the effects of improving system performance, saving costs, and reducing system peak-to-average ratios

Active Publication Date: 2020-09-11
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and MIMO system for reducing multi-antenna PAPR based on precoding, which is used to solve the problem of affecting system performance due to high PAPR in MIMO-OFDM systems

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  • Method of reducing multi-antenna papr based on precoding and mimo system
  • Method of reducing multi-antenna papr based on precoding and mimo system
  • Method of reducing multi-antenna papr based on precoding and mimo system

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Embodiment 1

[0053] see figure 1 , the present invention provides a method for reducing multi-antenna PAPR based on precoding, which is applicable to multi-user MIMO scenarios and massive MIMO scenarios, and the method at least includes the following steps:

[0054] Step 1), providing useful signal data streams and N sets of randomly generated virtual signal data streams, wherein N is a positive integer greater than or equal to 2;

[0055] Step 2), said N groups of virtual signal data streams and said useful signal data streams are mapped onto the transmitting antenna by precoding respectively, to obtain N groups of pre-transmission signals;

[0056] Step 3), performing inverse fast Fourier transform on the N groups of pre-transmission signals;

[0057] Step 4), calculate the PAPR of each group of pre-transmission signals, and compare them, and select a group of pre-transmission signals with the smallest PAPR among the N groups of pre-transmission signals for transmission.

[0058] As an...

Embodiment 2

[0074] The difference between this embodiment and the first embodiment is that the ratio of the power of the useful signal data stream to the power of the virtual data stream is Other steps are consistent with the first embodiment, and will not be repeated here.

[0075] image 3 is the power ratio of the useful signal data stream to the power of the virtual signal data stream as The graph of the complementary cumulative distribution function CCDF drawn in the case of , the solid line is the CCDF curve of the original transmission signal without adding the virtual signal data stream, and the dotted line is the CCDF curve of the transmission signal after using the method of this patent. pass image 3It can be seen that the proposed method of the present invention reduces the PAPR by about 2dB. And in the case that the receiving end does not add any additional overhead, the sending end does not need to send additional relevant information.

Embodiment 3

[0077] The present invention also provides a MIMO system that reduces multi-antenna PAPR based on precoding. The MIMO system includes a transmitting end 1 and a receiving end 2. Please refer to Figure 4 , the transmitting end 1 at least includes: a signal modulator 11, receiving useful signal data streams of different powers and virtual signal data streams of different powers, suitable for modulating the used signal data streams and virtual signal data streams; precoding Module 12, the input end of the precoding module 12 is connected to the output end of the signal modulator 11, and is suitable for precoding the modulated signal data stream and virtual signal data stream to obtain a number of pre-transmission signals, Wherein, the quantity of the pre-transmission signal is consistent with the quantity of the virtual signal data stream; the inverse Fourier transform module 13, the input end of the inverse Fourier transform module 13 is connected to the output end of the precod...

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Abstract

The invention provides a method of reducing peak-to-average power ratios (PAPR) of multiple antennas based on precoding and a multiple-input multiple-output (MIMO) system. The method comprises steps that useful signal data flows and randomly generated N groups of virtual signal data flows are provided; the N groups of virtual signal data flows and the useful signal data flows are mapped to transmitting antennas by the precoding to acquire N groups of pre-transmitting signals; the inverse fast fourier transform of the N groups of the pre-transmitting signals is carried out; the PAPR of each group of pre-transmitting signals is calculated, and all of the PAPRs are compared with each other, and then the group of pre-transmitting signals having the minimum PAPR is selected and transmitted. With help of the precoding technology of the multi-user MIMO, an inter-user interference thought is eliminated, and the virtual data flows are adopted as the signals of other users, and by adopting the precoding technology, a receiving end is only used to receive the useful signals, and therefore the peak-to-average ratio of the system is effectively reduced, the power efficiency of the system is improved, the structure of the system is not required to be changed, and costs are saved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and MIMO system for reducing multi-antenna PAPR based on precoding. Background technique [0002] MIMO (Multiple-Input Multiple-Output) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and receiving end, respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, thereby improving communication quality. It can make full use of space resources, realize multiple transmissions and multiple receptions through multiple antennas, and can double the system channel capacity without increasing spectrum resources and antenna transmission power, showing obvious advantages and gradually becoming the core of mobile communication technology. [0003] Orthogonal Frequency Division Multiplexing (OFDM) technology can obtain a very high d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0452H04B7/0456H04L27/26
CPCH04B7/0452H04B7/0456H04L27/2614Y02D30/70
Inventor 钱骅方舟裴旭明康凯朱正航
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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