固体电子学研究与进展
固體電子學研究與進展
고체전자학연구여진전
RESEARCH & PROGRESS OF SOLID STATE ELECTRONICS
2009年
4期
494-498
,共5页
功率放大器%数字预失真%查找表%误差向量幅度%邻道功率比
功率放大器%數字預失真%查找錶%誤差嚮量幅度%鄰道功率比
공솔방대기%수자예실진%사조표%오차향량폭도%린도공솔비
power amplifier%digital predistortion(DPD)%LUT%EVM%ACPR
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.
推導瞭無線通信繫統誤差嚮量幅度(EVM)與鄰道功率比(ACPR)指標的相互關繫,得齣瞭通過功放線性化改善ACPR使得繫統EVM減小的結論.隨後採用具備結構簡單、處理速度快、實時性好等優點的查找錶(LUT)方法設計數字預失真器(DPD),數字預失真器用FPGA方式實現.對該數字預失真器進行瞭倣真分析,驗證瞭理論推導結論,最後給齣DPD功率放大器試驗測試數據,與倣真結果吻閤良好.
추도료무선통신계통오차향량폭도(EVM)여린도공솔비(ACPR)지표적상호관계,득출료통과공방선성화개선ACPR사득계통EVM감소적결론.수후채용구비결구간단、처리속도쾌、실시성호등우점적사조표(LUT)방법설계수자예실진기(DPD),수자예실진기용FPGA방식실현.대해수자예실진기진행료방진분석,험증료이론추도결론,최후급출DPD공솔방대기시험측시수거,여방진결과문합량호.
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.
