摘要
推导了无线通信系统误差向量幅度(EVM)与邻道功率比(ACPR)指标的相互关系,得出了通过功放线性化改善ACPR使得系统EVM减小的结论。随后采用具备结构简单、处理速度快、实时性好等优点的查找表(LUT)方法设计数字预失真器(DPD),数字预失真器用FPGA方式实现。对该数字预失真器进行了仿真分析,验证了理论推导结论,最后给出DPD功率放大器试验测试数据,与仿真结果吻合良好。
The relationship between EVM and ACPR is derived in this paper. Same as ACPR, EVM of output signal is greatly improved when the power amplifier is linearized by DPD technique. Simulation results dovetail nicely with this conclusion. LUT-based DPD is employed and implemented by FPGA in this paper. Measurement results show that this DPD technique can greatly reduce power amplifier distortion.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
2009年第4期494-498,共5页
Research & Progress of SSE
基金
国家863项目(2009AA011801)
国家自然科学基金委创新群体基金(60621002)
