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Method for suppressing signal peak-to-average ratio based on ACE algorithm

A signal peak-to-average ratio and algorithm technology, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve the problems of increasing system iterative complexity, insufficient signal peak gain, and reduced ratio, to improve the suppression effect, wide-ranging Applications and systems achieve low-complexity effects

Active Publication Date: 2018-09-07
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that the system signal peak-to-average ratio PAPR suppression process needs to go through multiple iterations, and the least square estimation method needs to be used in each iteration process, and the use of multiple iterations and the least square estimation method has increased System iteration complexity
The disadvantage of this method is that as the order of Quadrature Amplitude Modulation (QAM) at the transmitter increases in practice, the proportion of frequency-domain constellation points participating in constellation expansion to all constellation points decreases, especially for 64QAM and above High-order M-QAM modulated OFDM system, signal peak-to-average ratio PAPR suppression gain is insufficient

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  • Method for suppressing signal peak-to-average ratio based on ACE algorithm
  • Method for suppressing signal peak-to-average ratio based on ACE algorithm
  • Method for suppressing signal peak-to-average ratio based on ACE algorithm

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[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] Refer to attached figure 1 , to further describe the specific steps of the present invention.

[0043] Step 1, modulate the bit stream.

[0044] Perform quadrature amplitude modulation on the binary bit stream output by the digital modulator at the transmitting end of the OFDM system to obtain a serial signal.

[0045]The quadrature amplitude modulation refers to selecting the quadrature modulation order that meets the requirements of transmission reliability according to the quality of the transmission channel of the OFDM system. The optional modulation orders of the binary bit stream to be modulated are 16-QAM, 64-QAM, and 256-QAM.

[0046] Step 2, change the transmission mode.

[0047] Serial signals are converted to parallel signals through a serial-to-parallel converter.

[0048] Step 3, upsampling the parallel signal.

[0049] The parallel signals ar...

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Abstract

The invention discloses a method for suppressing a signal peak-to-average ratio based on an active constellation extension ACE algorithm in an OFDM system for mainly solving the problem that the signal peak-to-average ratio in an orthogonal frequency division multiplexing OFDM system in the prior art is too high. The specific steps comprise: (1) modulating a bit stream; (2) transforming a transmission mode; (3) performing upsampling on a parallel signal; (4) clipping a frequency domain signal to obtain clipping noise; (5) defining a scalable range of a constellation point (6) performing activeconstellation extension ACE on the frequency domain signal; (7) correcting the preliminarily extended frequency domain signal; and (8) sending a frequency domain transmission signal. The method disclosed by the invention has the advantages of being suitable for the OFDM system of a high-order orthogonal amplitude modulation and having low implementation complexity, and the power utilization rateof a communication system transmitter is improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for suppressing peak-to-average ratio of signals based on an ACE (active constellation extension) algorithm in the technical field of wireless communication. The present invention can be used in an Orthogonal Frequency Division Multiplexing (OFDM) system of wireless communication, expands the signal constellation points of the sending end of the system, and realizes signal peak-to-average power ratio PAPR (Peak-to-Average PowerRatio) suppression In order to avoid signal distortion and system power efficiency loss caused by working in the non-linear range when the peak-to-average ratio signal passes through the power amplifier. Background technique [0002] In wireless communication, compared with single-carrier system, OFDM system with multi-carrier has higher transmission efficiency and spectrum efficiency. OFDM technology has been widely used in the field o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614H04L27/2623H04L27/2697
Inventor 王勇柳静雅田阗宫丰奎张南
Owner XIDIAN UNIV
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