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A method and system for suppressing ace of high-order modulated OFDM signal peak-to-average ratio

A signal peak-to-average ratio and high-order modulation technology, which is applied to the modulation carrier system, transmission system, multi-frequency code system, etc., can solve the problems of complex constellation diagram and the reduction of constellation point ratio, and reduce the number of iterations and complex operations degree, reduce the peak-to-average ratio, and the bit error rate will not seriously deteriorate the effect

Active Publication Date: 2021-08-17
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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  • A method and system for suppressing ace of high-order modulated OFDM signal peak-to-average ratio
  • A method and system for suppressing ace of high-order modulated OFDM signal peak-to-average ratio
  • A method and system for suppressing ace of high-order modulated OFDM signal peak-to-average ratio

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Embodiment Construction

[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 OFDM systems with large subcarriers 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 solutions....

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Abstract

The invention belongs to the technical field of electronic communication, and discloses a method and system for suppressing the peak-to-average ratio of high-order modulated OFDM signals, and redefines the expansion rules of the constellation in the frequency domain; Adjust the peak clipping threshold to obtain the effective peak-to-average ratio suppression gain, and at the same time seriously deteriorate the system bit error rate; after obtaining the effective peak-to-average ratio suppression gain, the appropriate expansion factor is obtained by modifying the least square approximation formula, and the original time domain The signal is amplified to enhance the signal peak-to-average ratio suppression effect. Based on the above optimization strategy, the present invention significantly reduces the peak-to-average ratio of OFDM transmission signals with only one iteration, greatly reduces the complexity of system implementation, and at the same time ensures that the loss of bit error rate and out-of-band power spectrum performance is within Within an acceptable range, 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. ...

Claims

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Application Information

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