基于坐标变换的射频功放预失真参数估计方法

doi:10.11959/j.issn.1000-436x.2015009

Abstract

Abstract:

Based on the low-IF digital predistortion (DPD) architecture,a coordinate transformation based low-complex coefficients estimation algorithm is proposed to reduce the hardware implementation cost and numerical calculation complexity significantly.The proposed algorithm transforms the complex multiplication of the conventional DPD coefficients estimation method to amplitude multiplication and phase addition in polar coordinates.To complete the same calculation,times of multiplications and accumulations are reduced by 75% and 50%.The algorithm is derived from the general Volterra pass-band nonlinear model,and proves the equivalency of baseband predistortion and IF predistortion.The proposed low-IF architecture and the coefficients estimation algorithm are verified by the measurement results on a practical radio frequency power amplifier.

Key words: radio frequency power amplifier, adaptive predistortion, nonlinearity, low-intermediate frequency, coefficients estimation

GHao HUAN,Hua QIAN,Sai-jie YAO,Xiu-mei YANG. Coordinate transformation based coefficients estimation algorithm for digital predistortion of RF power amplifiers[J]. Journal on Communications, 2015, 36(1): 75-83.

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类别	运算复杂度/次
类别	乘法运算	加法运算
基于复数运算的估计方法（传统算法）	4N(Q ³+4Q²+4Q)	2N(Q ³+2Q²+Q)
极坐标参数估计方法（新算法）	N(Q ³+4Q²+4Q)+3Q	N(Q ³+2Q²+4Q)?Q

类别	逻辑资源占用量/个	运算复杂度/次
10 bit × 10 bit乘法器/乘法运算	116	LUT6
10 bit+10 bit加法器/加法运算	5	LUT6

Coordinate transformation based coefficients estimation algorithm for digital predistortion of RF power amplifiers

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