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针对传统峰均功率比(PAPR)降低方法存在带内、带外畸变干扰问题,提出了一种变因子迭代峰值功率降低方法.首先,采用并行噪声成型滤波器降低消波引起的带外干扰,建立了基于峰值瞬时包络和迭代次数的时变尺寸因子,自适应抑制剩余带外噪声;然后,采用噪声对消的方法抑制峰值过载引起的带内再生干扰,并通过多步迭代的方式进行平滑处理.仿真结果表明:所提方法两步迭代后即可达到5.5dB的PAPR降低,有效改善了信号包络时变对功率放大器非线性的影响,保持了较好的星座特征,临道干扰平均降低了10dB.
Aiming at the problem of in-band and out-of-band distortions in traditional PAPR reduction methods, a variable iterative peak power reduction method is proposed.Firstly, the parallel noise shaping filter is used to reduce the out-of- The time-varying size factor based on the peak instantaneous envelope and the number of iterations is established to restrain the residual out-of-band noise adaptively. Then, the noise cancellation method is used to restrain the in-band regenerative interference caused by peak overload. The simulation results show that the proposed method can achieve PAPR reduction of 5.5dB after two steps iteration, effectively reducing the influence of signal envelope time-varying on the nonlinearity of the power amplifier, maintaining a good constellation feature, The average reduction of 10dB.