Method for reducing peak-to-average power ratio of filter bank multicarrier system

Abstract

The invention provides a method for reducing the peak-to-average power ratio of a multi-carrier system of a filter bank. The method comprises the following steps: setting an initial amplitude limiting amplitude A (1), the maximum number of iterations Q, a peak regeneration suppression factor xi, a penalty factor eta and a search step length rho; shearing the original signal, wherein the processed signal can be expressed as Sn after being processed by the FBMC-OQAM system, the FBMC-OQAM signal iteration amplitude limiting recursion updating formula can be expressed as the conversion of the shearing noise into the frequency domain signal to solve the optimal convergence factor mu; solving the optimal value A (i) of the amplitude limiting threshold value; and letting i = i + 1, repeating the above steps, and entering the next round of loop iteration until the algorithm converges. According to the method, a system model of the reserved subcarriers of the FBMC-OQAM system is constructed, a self-adaptive subcarrier reservation algorithm is provided based on essential reasons of the FBMC-OQAM and in combination with signal structure characteristics of the FBMC-OQAM, the PAPR of the system is reduced with a small number of iterations by performing self-adaptive learning on input data and adjusting an iteration threshold value and an amplitude limiting factor, and signal distortion is not caused.

Description

technical field [0001] The invention relates to the technical field of communication technology, in particular to a method for reducing the peak-to-average power ratio of a filter bank multi-carrier system. Background technique [0002] Due to the rectangular filter used in the OFDM system, its spectrum has a large side lobe, which causes a large out-of-band leakage, which further makes the OFDM system sensitive to spectrum offset, and it is difficult to maintain subcarrier orthogonality in complex fading channels. , and at the same time, due to the existence of CP, the spectrum utilization rate of the system is reduced to some extent. [0003] Due to the various defects of the OFDM system, OFDM will not be able to adapt to the development needs of future communications. For the improvement of OFDM, relevant research institutions in Europe have proposed a new multi-carrier technology, that is, filters using non-rectangular prototype signals Group multi-carrier technology. ...

AI Technical Summary

Problems solved by technology

[0002] Due to the rectangular filter used in the OFDM system, its spectrum has a large side lobe, which causes a large out-of-band leakage, which further makes the OFDM system sensitive to spectrum offset, and it is difficult to maintain subcarrier orthogonality in complex fading channels. , at the same time, due to the existence of CP, the spectrum utilization of the system is reduced to some extent

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