卫星通信中一种快速RPEM 算法

doi:10.3969/j.issn.1001-2400.2016.06.021

Abstract

Abstract:

The memory polynomial pre-distortion is an effective technique to compensate the nonlinearity for the satellite channel. However, its adaptive algorithm has the defect of the slow convergence speed. To counteract this problem, a fast shrinkage Recursive Prediction Error Method (SH-RPEM) algorithm is devised for the memory polynomial pre-distortion over the nonlinear satellite channel. By using a known Shrinkage method and L₁-L₂ minimization formulation, the relationship between the noise-free posteriori and priori error signal is obtained. Furthermore, an optimal forgetting factor which can significantly enhance the convergence speed is proposed by minimizing the mean square of the noise-free posteriori error signal. Simulation results show that the SH-RPEM algorithm can effectively suppress constellation wrapping and spectrum regrowth of the signal and solve the nonlinear distortion. Moreover, the SH-RPEM algorithm can achieve a faster convergence speed and better stability without increasing the computational complexity.

Key words: satellite communication, nonlinear, pre-distortion, channel

LI Liangshan;YANG Yuhong;WANG Lan. Fast RPEM algorithm in satellite communication[J].Journal of Xidian University, 2016, 43(6): 122-128.

References

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Fast RPEM algorithm in satellite communication

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