摘要
针对无线通信系统中射频功放的强非线性、强记忆效应特征,提出一种改进的多支路组合模型——改进的动态记忆多项式(G-DMP)模型。该模型以动态记忆多项式模型为基础,引入记忆时刻输入信号包络对当前输入信号的影响项和当前输入信号包络对记忆时刻输入信号的影响项,更灵活地对功放强记忆效应建模。同时采用改进的RLS_LMS联合算法对G-DMP模型进行自适应预失真系统仿真。结果表明:G-DMP模型比DMP模型精度优于0.5dB时,系数减少14.29%,邻信道功率比(ACPR)改善了4dB,由此可知,G-DMP模型能获得更好的建模精度和线性化效果。
In view of strong nonlinear and memory effect of radio frequency power amplifier in the wireless com-munication system, this paper proposed the improved multi-drop combined behavior model-Improved dynamic mem-ory polynomial （G-DMP） model. It was based on dynamic memory polynomial model, then added cross terms of in-put signals envelope at memory time to current time and input signals envelope at current time to memory time, and modeled the memory effect model of power amplifier more flexibly. Concurrently, G-RLS_LMS algorithm was pro-posed and used for adaptive predistortion system simulation. Simulation results demonstrated that： comparing to DMP model, when the precision increased by 0.5dB, G-DMP model coefficients reduced by 14.29%, and adjacent channel power ratio （ACPR） improved 4dB. So the G-DMP model can obtain better precision and linear effect.
出处
《激光杂志》
CAS
CSCD
北大核心
2014年第7期50-54,共5页
Laser Journal
基金
国家自然科学基金资助项目(61372058)
辽宁省高等学校优秀科技人才支持计划(LR2013012)
关键词
功率放大器
行为模型
自适应算法
预失真
记忆多项式
Power amplifier
Behavior model
Adaptive algorithm
Pre-distortion
Memory polynomial
