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GFDM signal PAPR suppression method based on precoding matrixes

A technology of precoding matrix and signal, applied in the field of 5G communication, can solve the problem that the suppression effect is not ideal and so on

Inactive Publication Date: 2017-09-19
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Literature [Tiwari S, Das S S, Bandyopadhyay KK. Precoded generalized frequency division multiplexing system to combatinter-carrier interference: performance analysis [J]. IET Communications, 2015,15(9):1829-1841.] proposed an interleaved frequency division Multiple access technology (IFDMA) is used to reduce the PAPR of GFDM system. Interleaved frequency division multiple access technology can be regarded as a multi-carrier spectrum spread technology, which not only does not increase the system bit error rate but also reduces the impact of nonlinear channels on GFDM signals. However, the inhibitory effect on PAPR is not ideal

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  • GFDM signal PAPR suppression method based on precoding matrixes
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  • GFDM signal PAPR suppression method based on precoding matrixes

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Embodiment Construction

[0038] The technical solutions in the embodiments of the present invention will be described clearly and in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0039] The technical scheme that the present invention solves the problems of the technologies described above is:

[0040] The basic model of the transmitting end of the GFDM multi-carrier system is as follows: figure 1 shown. The binary sequence b completes the corresponding constellation mapping through QAM modulation, and obtains a sequence d=(d 0 , d 1 ,...,d n,...,d MK-1 ) T , after serial-to-parallel conversion, K parallel data streams containing M symbols are formed d k ={d 0,k , d 1,k ,...,d M-1,k} T , (k=0,1,...,K-1), after each signal is up-sampled with a sampling factor of N (N≥K, to meet the Nyquist criterion), each subcarrier has MN symbols.

[0041] Then enter the...

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Abstract

The invention relates to a PAPR suppression scheme based on precoding matrixes. The PAPR suppression scheme based on precoding matrixes includes the steps: theoretically, deriving the relation between the PAPR performance of a GFDM system and the autocorrelation function among data signals which are propagated at the same time slot; by means of transformation of linear matrixes, improving the distribution characteristics of PAPR, and obtaining three different precoding matrixes: DFT-Precoding, WHT-Precoding and DHT-Precoding, performing linear transformation on the input complex data signal, introducing phase scrambling codes, and reducing the instantaneous power of the GFDM signal by changing the correlation among the data symbols propagated on different carrier waves at the same time slot, so as to achieve the aim of reducing the system PAPR. The PAPR suppression scheme based on precoding matrixes can guarantee no sacrifice of BER performance while suppressing PAPR, and has no big influence on the frequency spectrum of the GFDM signal, wherein the theoretical analysis and the simulation result also verify the performance and the effect of PRPR suppression.

Description

technical field [0001] The invention belongs to the technical field of 5G communication, and in particular relates to a technique for reducing peak-to-average ratio in filter bank multi-carrier technology. Background technique [0002] Currently, the mobile communication network is evolving from the fourth generation mobile communication technology (4G) to the fifth generation mobile communication technology (5G). Deploy the right technology, spectrum and bandwidth, and support efficient multiplexing for future services and terminal types. The Orthogonal Frequency Division Multiplexing (OFDM) used in 4G can no longer meet the new characteristics of 5G. In recent years, many research teams have devoted themselves to finding alternative waveforms for OFDM, filter bank multicarrier technology (FBMC), general Filter multi-carrier technology (UFMC) and generalized frequency division multiplexing technology (GFDM) [6] have been proposed one after another. The main advantage of G...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/0456
Inventor 谢显中张苗吴垒
Owner CHONGQING UNIV OF POSTS & TELECOMM
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