OFDM system peak power optimization method based on Arnold transformation

Abstract

The invention provides an OFDM (Orthogonal Frequency Division Multiplexing) system peak power optimization method based on Arnold transformation. The method comprises the following steps of dividing an originally input binary data sequence into a plurality of sub-block sequences and adding an augmented sequence; arranging each sub-block sequence into a square matrix; making Arnold transformation on each square matrix one by one; rearranging each square matrix into a candidate sub-block sequence; recombining the candidate sub-block sequences into a data sequence; carrying out phase shift keyingmapping on each recombined data sequence; obtaining a corresponding frequency domain data sequence; performing Arnold transformation on the frequency domain data sequence again according to the modeto obtain a recombined frequency domain data sequence; respectively carrying out IFFT (Inverse Fast Fourier Transform) on each frequency domain data sequence to obtain corresponding candidate signals,calculating PAPR (Peak to Average Power Ratio) values of the candidate signals, and selecting the candidate signal with the minimum PAPR value from all the candidate signals for transmission. The biterror rate similar to that of an original OFDM system is obtained on the premise that side information does not need to be sent.

Description

technical field [0001] The present disclosure relates to the technical field of digital communication, in particular to an OFDM system peak power optimization method based on Arnold transform. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technology that can divide high-speed serial data signals into multiple parallel low-speed sub-channels. Then on each low-speed parallel sub-channel, different modulation techniques are used to modulate data to different orthogonal sub-carriers to realize parallel transmission of sub-data streams. Because OFDM has the ability to resist multipath fading and the ability to adapt to channel changes, this technology can be widely used in various digital transmission and communication systems, such as high bit rate digital sub...

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Problems solved by technology

[0015] The inventors of the present disclosure found that although the probabilistic technology has the best PAPR reduction performance, it also has its disadvantages: although it probabilistically reduces the PAPR of the system by rotating the data sequence at the transmitting end, it does not at the receiving end It is not known how the phase rotation of the data sequence has occurred, so it is necessary to send side information along with the signal to help the receiver demodulate the received signal

After the side information is interfered by wireless channel noise, it is often recovered by error at the receiving end, resulting in wrong demodulation of the signal at the receiving end, resulting in serious distortion of the system

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