摘要
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.
A variable factor iterative peak power reduction method was proposed for the problem that the traditional peak to average power ratio （PAPR）reduction method exists in-band and out-of-band distortion interference phenomenon.Firstly,the parallel noise shaping filter was used to reduce out-of-band interference which caused by clipping.The time-varying scaling factor was established to sup-press the residual out-of-band noise adaptively,which based on the instantaneous envelope peak and the number of iterations.Then,the clipping noise cancellation method was used to suppress in-band peak re-growth interference caused by peak overload.The multi-step iterative method was used to smooth the suppressed signal.Simulation results show that the proposed method can achieve 5 .5 dB PAPR reduction after two-step iterative,and improve the effect of the signal envelope time-varying to power amplifier.And the method maintains a good constellation characteristics and improves the adj a-cent channel interference to 1 0 dB.
作者
李伟
孟进
何方敏
唐健
Li Wei Meng Jin He Fangming Tang Jian(National Key Laboratory for Vessel Integrated Power System Technology, Naval University of Engineering, Wuhan 430033, Chin)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第9期38-42,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(61201055
51422705)
关键词
峰均功率比
功率放大器
临道干扰
消波滤波
噪声形成滤波器
自适应滤波器
peak to average power ratio
power amplifier
adj acent channel interference
clipping fil-ter
noise shaping filter
adaptive filter
