Abstract: Performance of conventional baseband digital predistortion method for power amplifier（PA） degrades severely as the accuracy of loop delay compensation（LDC） decreases.LDC error free method based on cumulative distribution function（CDF） is proposed by previous works，but the phase nonlinearity of PA is neglected.A new LDC error free baseband predistortion method based on histogram matching is proposed in this paper，which considers not only amplitude but also phase nonlinearities of PA.Simulation result shows that the proposed method is free of LDC error and performs better than conventional methods in improving system amplitude and phase nonlinearities.

摘要： 传统功放基带预失真方法在系统环路延迟补偿精度下降时性能迅速下降，已有的基于累积分布函数的方法无需精确的环路延迟补偿，但其忽略了功放的相位非线性，应用受到限制。提出了一种基于直方图匹配方法求解功放幅度和相位非线性特性，从而构建基带预失真器的方法。仿真结果证明，该方法能够有效改善功放的幅度和相位非线性，效果优于传统方法，且无需进行环路延迟补偿。