A Papr Reduction Method for FBMC Signal Based on Penalized Bump Process

Abstract

The present invention proposes a method for reducing PAPR of an FBMC signal based on a penalty concave-convex process. The method includes the following steps: First, construct an optimization problem according to the parameters of the FBMC system, that is, take the transmitted symbol as a variable, and use the symbol deformation and freedom on the data subcarrier The transmit power on the subcarrier is constrained, and the PAPR of a frame of FBMC signal is minimized; secondly, the optimization problem is equivalently transformed to obtain an equivalent problem that satisfies the algorithm framework of the penalty bump process; then, according to the two-layer iterative algorithm based on the penalty bump process Solve the optimization problem, in which the outer layer iteratively updates the penalty parameters, the inner layer iterates the fixed penalty parameters and solves the penalty problem according to the bump process and the block coordinate descent method; finally outputs the calculation results and obtains the FBMC sending signal with lower PAPR; The present invention utilizes the penalty concave-convex process to optimize and reduce the PAPR of the FBMC signal. Compared with the traditional heuristic iterative algorithm, the method can significantly reduce the PAPR of the FBMC signal when the bit error rate increases slightly.

Description

technical field [0001] The invention relates to a method for reducing the PAPR of an FBMC signal, in particular to a method for minimizing the PAPR of a frame of FBMC signals by using a penalty concave-convex process when the transmitted signal satisfies a certain deformation constraint. Background technique [0002] FBMC is a multi-carrier modulation method based on pulse shaping, that is, sub-carrier filtering. According to the Heisenberg-Gabor uncertainty principle, the time domain and frequency domain width of a pulse cannot be reduced simultaneously. In order to reduce the out-of-band spectrum leakage, FBMC uses a shaped pulse with a narrow frequency domain width, and the corresponding pulse time domain width will increase. The time-domain width of the shaped pulse used by FBMC is usually several symbol periods, and there will be overlap between adjacent symbols, so FBMC is a non-orthogonal waveform. [0003] Similar to conventional OFDM, FBMC signals have high PAPR, ...

AI Technical Summary

Problems solved by technology

However, due to the overlapping of FBMC symbols, when reducing the PAPR of a signal in a symbol interval, the PAPR of a signal in an adjacent symbol interval will also be affected, so the symbol-by-symbol PAPR reduction algorithm designed for traditional OFDM is no longer applicable to FBMC system

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