Signal peak-to-average ratio reduction method for orthogonal frequency division multiplexing (OFDM) system

Abstract

The invention discloses a signal peak-to-average ratio reduction method for an orthogonal frequency division multiplexing (OFDM) system. A peak-to-average ratio is reduced by combining a constellation extension method and null sub-carriers. Regulation is performed on data sub-carriers according to constellation extension rules. Frequency domain filtering is performed on the null sub-carriers. In the method, amplitude-prelimited signal noises are processed to generate a peak cancellation vector in ways of regulating data on the data sub-carriers according to the constellation extension rules, performing a frequency domain filtering operation on the null sub-carriers, reserving noises of a null sub-carrier part and zero-setting the noises of a data sub-carrier part to completely transfer the noises to areas of the null sub-carriers and constellation extension without influencing judgment in a constellation diagram of a receiver to further reduce the peak-to-average ratio of a signal. By the method, the peak-to-average ratio of the OFDM signal can be effectively reduced, and iteration times can be reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to PAPR (Peak-to-Average Ratio Reduction) technology in an Orthogonal Frequency Division Multiplexing (OFDM) system, which is an Orthogonal Frequency Division The method of reducing the signal peak-to-average ratio in the multiplexing system is used in the design of the peak-to-average power ratio in OFDM, and combines the constellation extension method (ACE) with the empty subcarrier in OFDM to reduce the signal peak-to-average ratio and accelerate the iterative convergence of the ACE algorithm speed, and more effectively reduce the peak-to-average power ratio of the signal. Background technique [0002] With the increasing demand for mobile communications and wireless networks, more advanced wireless transmission technologies are increasingly required. One of the most immediate challenges in the design of high-speed wireless communication systems is to over...

AI Technical Summary

Problems solved by technology

Among the above methods, the constellation extension method is a clipping-based method that does not need to transmit sideband information. The clipping noise is optimized by adjusting the constellation diagram, and finally achieves the purpose of distortion-free transmission. However, in order to To achieve a lower peak-to-average ratio, more iterations are required

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