CAJ | 학술논문

目前数字预失真技术的研究多偏重在不同算法的仿真方面,对具体实现技术的研究较少。为此,设计一种基于可编程片上系统( SOPC)的自适应数字预失真器。采用多项式查找表电路来实现预失真功能,用现场可编程门阵列( FPGA)内的EDK工程完成系数计算,以避免全硬件实现带来的复杂性。以IP核的形式下载到Xilinx FPGA上,并在测试平台对其进行验证,结果表明,该预失真器能改善功放的线性度,对于8 MHz带宽的OFDM信号和doherty结构的GaN功放,ACPR可改善8 dB,并且具备自适应功能,可较好地应用到实际工作环境中。
목전수자예실진기술적연구다편중재불동산법적방진방면,대구체실현기술적연구교소。위차,설계일충기우가편정편상계통( SOPC)적자괄응수자예실진기。채용다항식사조표전로래실현예실진공능,용현장가편정문진렬( FPGA)내적EDK공정완성계수계산,이피면전경건실현대래적복잡성。이IP핵적형식하재도Xilinx FPGA상,병재측시평태대기진행험증,결과표명,해예실진기능개선공방적선성도,대우8 MHz대관적OFDM신호화doherty결구적GaN공방,ACPR가개선8 dB,병차구비자괄응공능,가교호지응용도실제공작배경중。
At present, the study of the Digital Predistortion ( DPD ) mainly focuses on the simulation of different algorithms,and the specific implementation technology research is less. A kind of adaptive digital predistortion device based on System on a Programmable Chip( SOPC) is proposed in this paper,the design adopts polynomial lookup table circuit to achieve the predistortion, and uses EDK project complete coefficient calculation. This method avoids the complexity brought by the whole hardware implementation,can satisfy the requirements of the adaptive function,and has the very strong practical value. Finally it downloads the design to Xilinx FPGA,and tests it in a test platform. Results show that the predistorter can effectively improve the linearity of the power amplifier. For the OFDM signal of 8 MHz bandwidth and the doherty GaN amplifier, ACPR can improve 8 dB and with the adaptive function, it can be a good application to the actual working environment.