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Method of reducing PAPR of multiple antennas 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, reducing system peak-to-average ratio, and saving costs

Active Publication Date: 2018-08-03
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 PAPR of multiple antennas based on precoding and MIMO system
  • Method of reducing PAPR of multiple antennas based on precoding and MIMO system
  • Method of reducing PAPR of multiple antennas 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 suitable for multi-user MIMO scenarios and massive MIMO scenarios. The method at least includes the following steps:

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

[0055] Step 2). Map the N groups of virtual signal data streams and the useful signal data streams to the transmitting antennas through precoding to obtain N groups of pre-transmitted signals;

[0056] Step 3) Perform inverse fast Fourier transform on the N groups of pre-transmitted signals;

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

[0058] As an example, it is assumed that there are L transmit...

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 ratio of the power of the useful signal data stream to the power of the virtual signal data stream In the case of drawing the complementary cumulative distribution function CCDF curve, the solid line is the CCDF curve of the original emission signal without virtual signal data stream, and the dashed line is the CCDF curve of the emission signal after using the method of this patent. by image 3 It can be seen that the method proposed in the present invention reduces the PAPR by about 2dB. And when the receiving end does not add any additional overhead, there is no need for the sending end to send additional related information.

Embodiment 3

[0077] The present invention also provides a MIMO system for reducing multi-antenna PAPR based on precoding. The MIMO system includes a transmitter 1 and a receiver 2, please refer to Figure 4 The transmitting end 1 includes at least: a signal modulator 11, which receives useful signal data streams of different powers and virtual signal data streams of different powers, and is suitable for modulating the signal data streams and virtual signal data streams; precoding Module 12, the input terminal of the precoding module 12 is connected to the output terminal of the signal modulator 11, and is suitable for precoding the modulated signal data stream and virtual signal data stream to obtain several pre-transmission signals, Wherein, the number of the pre-transmission signal is the same as the number 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 precoding modul...

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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 field of wireless communication technology, in particular to a method for reducing multi-antenna PAPR based on precoding and a MIMO system. 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 the receiving end, thereby improving communication quality. It can make full use of space resources and achieve multiple transmissions and receptions through multiple antennas. Without increasing spectrum resources and antenna transmission power, it can double the system channel capacity, showing obvious advantages, and gradually becoming the core of mobile communications. technology. [0003] Orthogonal Frequency Division Multiplexing (OFDM) technology can achieve very high data t...

Claims

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Application Information

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Patent Type & Authority Applications(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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