Method of inhibiting PAPR in OFDM system based on BA

A bat algorithm and bat technology, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as implementation difficulties, unsatisfactory PAPR suppression effect, and low algorithm efficiency.

Inactive Publication Date: 2016-06-15
HEBEI UNIV OF TECH
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Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for suppressing PAPR in an OFDM system based on the bat algorithm, which can optimize the phase combination by using the bat algorithm without increasing the complexity of the system too much. Better suppress PAPR, overcome the disadvantages that the existing technology is still not ideal for PAPR suppression, the efficiency of the algorithm is low, and it is difficult to implement

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  • Method of inhibiting PAPR in OFDM system based on BA

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Embodiment Construction

[0042] The concrete steps of the method for suppressing PAPR in the OFDM system based on bat algorithm of the present invention are:

[0043] In the first step, in the OFDM system, the source binary bit stream at the transmitter is mapped and serial-to-parallel converted to form multiple low-speed data streams D m , the data stream D m The signal is modulated onto the subcarrier by IFFT (that is, the inverse Fourier transform), and the signal IFFT (D m );

[0044] In the second step, the bat algorithm is used to optimize the initial phase of the subcarrier generated in the first step. The specific steps of the bat algorithm to optimize the subcarrier phase are as follows:

[0045] 1) Initialize the parameters of the bat algorithm, and use a random function to initialize the position x of each bat i and speed v i , where i∈[1,n], n is the number of bats; input the maximum number of iterations iter_max, the number of bats n, the pulse volume A i , population dimension m, pu...

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Abstract

The invention provides a method of inhibiting a PAPR (Peak-to-Average Power Ratio) in an OFDM (Orthogonal Frequency Division Multiplexing) system based on a BA (Bat Algorithm). The method comprises the steps of: first, in an OFDM system, the information source binary system bit stream of a transmitting terminal forming a plurality of paths of low speed data stream Dm through mapping and serial-parallel conversion, and the data stream Dm modulating signals to subcarriers through IFFT (Inverse Fast Fourier Transform) to obtain a signal IFFT (Dm); second, employing a BA to optimize the initial phase of the subcarriers generated in the first step; and third, employing the optimal phase factor theta m generated in the second step to optimize the signal IFFT (Dm) generated in the first step to obtain an optimized signal IFFT (Dm)*e<jo>m, performing parallel-serial conversion, adding cyclic prefix, and digital to analog conversion on the optimized signal to generate an OFDM signal, and sending the OFDM signal to a channel, thereby realizing high PAPR inhibition in the OFDM system.

Description

technical field [0001] The technical scheme of the invention relates to a multi-carrier transmission system of digital information, specifically a method for suppressing PAPR in an OFDM system based on bat algorithm. Background technique [0002] Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) technology is one of the multi-carrier transmission technologies. Due to its obvious advantages such as high spectrum utilization, effective resistance to inter-symbol interference, and anti-multipath fading, it has received extensive attention in recent years. . However, due to a series of defects in the OFDM technology, it faces many difficulties and challenges in application, one of which is a relatively high peak-to-average power ratio (Peak-to-Average Power Ratio, hereinafter referred to as PAPR), referred to as peak-to-average ratio. High PAPR will distort the transmission signal, degrade the performance of the entire system and affect the efficiency...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2618H04L27/263
Inventor 刘剑飞王少影曾祥烨卢嘉王蒙军
Owner HEBEI UNIV OF TECH
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