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DSSS-GFDM system PAPR suppression method based on DFT precoding in 5G satellite communication

A satellite communication and precoding technology, applied in the field of communication, to achieve the effect of peak-to-average ratio suppression

Inactive Publication Date: 2021-06-25
SUN YAT SEN UNIV
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Problems solved by technology

[0007] The present invention provides a DSSS-GFDM system PAPR suppression method based on DFT precoding in 5G satellite communication, which solves the problem of peak-to-average power ratio (PAPR) caused by the superposition of multiple carriers

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  • DSSS-GFDM system PAPR suppression method based on DFT precoding in 5G satellite communication
  • DSSS-GFDM system PAPR suppression method based on DFT precoding in 5G satellite communication
  • DSSS-GFDM system PAPR suppression method based on DFT precoding in 5G satellite communication

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Embodiment 1

[0064] This embodiment provides a DSSS-GFDM system PAPR suppression method based on DFT precoding in 5G satellite communication, such as Figure 1 to Figure 2 , including the following steps:

[0065] S1: At the transmitting end, perform constellation mapping preprocessing on the binary data bit stream to obtain constellation mapping symbols;

[0066] S2: Extend the constellation mapping symbols by using the direct sequence spread spectrum technique DSSS;

[0067] S3: Perform discrete Fourier transform DFT on the extended constellation mapping symbols to obtain DFT precoded signals;

[0068] S4: Perform GFDM modulation on the DFT precoded signal, add CP, and send it to the wireless channel through radio frequency for transmission;

[0069] S5: After receiving the signals processed by steps S1 to S4, the receiving end performs channel estimation, synchronization, CP deletion and channel equalization on the received signals, and then demodulates them through the GFDM demodulat...

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Abstract

The invention discloses a DFT precoding-based DSSS-GFDM system PAPR suppression method in 5G satellite communication, and the method comprises the steps: carrying out the constellation mapping, direct sequence spread spectrum technology and discrete Fourier transform of a data stream at a transmitting end, carrying out GFDM modulation, adding CP, and transmitting the data stream to a wireless channel through radio frequency for transmission; and after channel estimation, synchronization, CP deletion and channel equalization are sequentially carried out on the received signal at a receiving end, demodulation, inverse discrete Fourier transform, direct sequence de-spreading and constellation de-mapping are carried out. According to the invention, the discrete Fourier transform (DFT) precoding technology is applied in the DSSS-GFDM system to suppress the PAPR, and at the same time, satisfactory BER performance is maintained, so that the DSSS-GFDM system is more suitable for a 5G satellite communication system.

Description

technical field [0001] The present invention relates to the technical field of communications, and more specifically, to a DFT precoding-based PAPR suppression method for a DSSS-GFDM system in 5G satellite communications. Background technique [0002] In recent years, with the continuous deepening of the integration of space and ground in information networks, international standardization organizations such as the International Telecommunication Union (ITU), the Third Generation Partnership Project (3GPP), and the 5G Satellite and Terrestrial Network (SaT5G) Alliance have been working to integrate The satellite communication system is integrated with the 5G system communication system. The densely deployed 5G ground system can better solve the problem of ultra-large-capacity wireless coverage with a low-cost solution. However, for remote areas and oceans, the ground 5G system lacks an effective low-cost wireless coverage solution, and it is also difficult to meet the needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/0456H04B7/185
CPCH04L27/2615H04B7/0456H04B7/1851H04B7/18519
Inventor 姜园刘寰宇张琳
Owner SUN YAT SEN UNIV
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