Method and system for suppressing ACE of peak-to-average ratio of high-order modulation OFDM signal

A signal peak-to-average ratio, high-order modulation technology, applied in the modulation carrier system, transmission system, multi-frequency code system, etc., can solve the problems of complex constellation diagram and reduced constellation point ratio.

Active Publication Date: 2019-10-15
XIDIAN UNIV
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Problems solved by technology

[0012] (2) As the modulation order used in the OFDM system increases, the constellation diagram becomes more complex, and the proportion of scalable constellation points decreases

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  • Method and system for suppressing ACE of peak-to-average ratio of high-order modulation OFDM signal
  • Method and system for suppressing ACE of peak-to-average ratio of high-order modulation OFDM signal
  • Method and system for suppressing ACE of peak-to-average ratio of high-order modulation OFDM signal

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[0088] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0089] In the prior art, the signal peak-to-average ratio suppression effect in the OFDM system with large sub-carriers and high-order modulation is poor, which cannot reduce the complexity of system implementation, and cannot guarantee the bit error rate and out-of-band in real time. The loss of power spectrum performance is within an acceptable range, making the overall performance of the OFDM system very low. In the prior art, the application cost in the communication system is high.

[0090] In order to solve the above problems, the present invention will be described in detail below in conjunction with specific soluti...

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Abstract

The invention belongs to the technical field of electronic communication, and discloses a method and a system for suppressing ACE of a peak-to-average ratio of a high-order modulation OFDM signal. Themethod comprises steps of redefining expansion rules of constellation in frequency domain; dynamically adjusting a peak clipping threshold according to the peak-to-average ratio of the current signalto obtain an effective peak-to-average ratio suppression gain, and enabling the bit error rate of the system not to be seriously deteriorated; after the effective peak-to-average ratio suppression gain is obtained, obtaining a proper expansion factor by correcting a least square approximation formula, amplifying an original time domain signal, and enhancing the signal peak-to-average ratio suppression effect. Based on the optimization strategy, the peak-to-average ratio of OFDM transmission signals is remarkably reduced under the condition that only one iteration is needed, the implementationcomplexity of the system is greatly reduced, meanwhile, it is guaranteed that the bit error rate and the loss of the out-of-band power spectrum performance are within an acceptable range, and the overall performance of the OFDM system is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electronic communication, and in particular relates to a method and system for suppressing ACE of high-order modulation OFDM signal peak-to-average ratio. Background technique [0002] Currently, the closest prior art: [0003] Orthogonal frequency division multiplexing OFDM multi-carrier modulation technology has been widely used in various wireless communication systems due to its advantages of high spectrum efficiency and high transmission reliability, and has become one of the key technologies of the fifth generation mobile communication system. The OFDM system adopts the data parallel transmission method and uses mutually orthogonal sub-carriers to transmit data. When the modulated signal undergoes discrete Fourier transform IFFT, when multiple signals with similar phases or the same signal are superimposed, a large instantaneous power, causing a PAPR problem with higher signal-to-average ratios. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 王勇刘玉卓
Owner XIDIAN UNIV
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