摘要
针对传统预失真结构的不足,提出一种双环结构的预失真新方法,实现了直接型与间接型学习结构的结合,在拥有较强抗噪能力的同时,回避了算法收敛性问题。此外,在信号处理过程中加入信号均衡模块,对自适应预失真电路中前向及反馈支路的线性失真进行补偿。最终的频谱、星座图和误比特率仿真结果表明,该方法是可行的,其线性化性能较原来有很大的改进,对预失真电路的研究有较大的参考价值。
To overcome disadvantages of conventional pre-distortion structures,a new pre-distortion method using a dual-loop structure was proposed,in which direct and indirect learning structures were combined.The new method avoided convergence problem of adaptive algorithm,while having a high anti-noise performance.In addition,a signal equalizer was used to compensate for linear distortion of forward and feedback branches in adaptive pre-distortion circuit.The final spectrum,constellation chart and bit-error ratio simulation demonstrated the feasibility of the method,which had a better linearity than the previous methods.
出处
《微电子学》
CAS
CSCD
北大核心
2013年第3期440-444,共5页
Microelectronics
基金
国家自然科学基金资助项目"宽带射频功率放大器非线性及行为模型的研究"(60971048)
国家科技重大专项资助项目"新一代宽带无线移动通信网一面向RoF等新型组网技术的射频器件与模块"(2010ZX03007-002-03)
关键词
数字预失真
均衡器
双环
功率放大器
线性化
Digital pre-distortion
Equalizer
Dual-loop
Power amplifier
Linearity
