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A Method for Reducing Peak-to-Average Power Ratio of Transform Domain Communication System

A peak-to-average power ratio, communication system technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of weakened orthogonality, reduced peak-to-average power ratio of transform domain communication systems, and high complexity. Achieve the effect of reducing the peak-to-average ratio, simplifying the system complexity, and reducing the amount of calculation.

Active Publication Date: 2018-09-11
XIJING UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for reducing the peak-to-average power ratio of the transform domain communication system, which can reduce the complexity of the peak-to-average power ratio while maintaining the orthogonality of the basis functions, and solve the problem of the existing TDCS peak-to-average power ratio. The problems of high complexity and weakened orthogonality in the suppression method

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  • A Method for Reducing Peak-to-Average Power Ratio of Transform Domain Communication System
  • A Method for Reducing Peak-to-Average Power Ratio of Transform Domain Communication System
  • A Method for Reducing Peak-to-Average Power Ratio of Transform Domain Communication System

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Embodiment

[0118] The first step is to estimate the frequency spectrum at the sending end and do the quantitative product with the complex random phase to obtain the basis function vector;

[0119] First, the transmitter estimates the spectrum of the surrounding electromagnetic environment, and obtains the basis function magnitude spectrum vector A t =[A t0 ,A t1 ,...,A t31 ], available frequency points N A =20; randomly generate phases in [0,2π] Get the complex random phase sequence vector The magnitude spectrum vector of the basis function is multiplied with the phase to obtain the spectrum vector of the basis function

[0120] The second step: set the initial population number S=100, the upper limit of the population up=1.3 and the lower limit of the population low=0.7, the coefficient of variation F=0.3, the penalty function factor ε=0.5 and the maximum evolutionary generation G=400;

[0121] Step 3: Initialize the population to obtain a set of random numbers generated in t...

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Abstract

The invention discloses a method for reducing a peak-to-average power ratio of a transform domain communication system. The specific method is as follows: 1) respectively setting an initial population number S, an upper population limit up, a lower population limit low, a variable coefficient F, a penalty function factor epsilon and a maximum generation G; 2) initializing the set populations, and respectively calculating a weighted basis function b0 and a fitness function PAPR0; 3) randomly selecting a part of generated population individuals; 4) varying the selected population individuals; 5) carrying out cross swap on the individuals in the varied population; 6) respectively calculating a weighted basis function bi and a fitness function PAPRi of a matrix Ti, comparing the size of PAPRi and PAPR0 in the step 2, and carrying out corresponding judgments; and 7) obtaining an optimal amplitude weighting factor vector (the expression is described in the specification) and a minimum peak-to-average ratio Pbest. The method disclosed by the invention is used for solving the problems of high complexity and weak orthogonality of the existing TDCS peak-to-average ratio inhibition method.

Description

technical field [0001] The invention belongs to the technical field of wireless communication methods, and in particular relates to a method for reducing the peak-to-average power ratio of a transform domain communication system. Background technique [0002] Transform domain communication system (TDCS, transform domain communication system) is a new technology developed on the basis of cognitive radio (CR, Cognitive Radio), spread spectrum communication and transform domain processing technology. The effectiveness of spectrum utilization has received more and more attention. However, due to the peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR) of the tDCS signal, the tDCS signal will have problems of out-of-band radiation and a drop in the bit error rate when passing through a nonlinear amplification device. [0003] Aiming at the peak-to-average ratio problem of tDCS, Professor Richard K.Martin of the U.S. Air Force Institute of Technology proposed a method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2614
Inventor 褚振勇达新宇王舒李牧东张亚普王荃朱丽莉
Owner XIJING UNIV
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