CAJ | 학술논문

为提高通信质量,针对功率放大器的记忆效应和动态非线性特征,提出一种新型的三箱PLTC ( parallel-LUT-TMP-CIMT)模型。该模型由查找表、三角记忆多项式和记忆时刻信号交叉项并联构成。 PLTC模型用于功率放大器的行为模型建模以及数字预失真的应用,使用16 QAM信号驱动一个强非线性Doherty功放来验证模型的性能,把PLTC模型应用在预失真中,经过PLTC预失真后,邻信道功率比减少大约22 dB。将PLTC模型与多项式MP模型、一般多项式GMP模型和LMEC模型这3种模型进行精度与计算系数复杂度的比较,结果表明,PLTC模型能够达到较好的精度,同时可以大幅降低计算系数。
위제고통신질량,침대공솔방대기적기억효응화동태비선성특정,제출일충신형적삼상PLTC ( parallel-LUT-TMP-CIMT)모형。해모형유사조표、삼각기억다항식화기억시각신호교차항병련구성。 PLTC모형용우공솔방대기적행위모형건모이급수자예실진적응용,사용16 QAM신호구동일개강비선성Doherty공방래험증모형적성능,파PLTC모형응용재예실진중,경과PLTC예실진후,린신도공솔비감소대약22 dB。장PLTC모형여다항식MP모형、일반다항식GMP모형화LMEC모형저3충모형진행정도여계산계수복잡도적비교,결과표명,PLTC모형능구체도교호적정도,동시가이대폭강저계산계수。
In order to improve the communication quality,this paper proposes a new,accurate,and complexity-reduced PLTC( parallel-LUT-TMP-CIMT) model according to the memory effect and nonlinearity effect characteristics of the radio frequency power amplifier in modern wireless communication system. This model is composed of a Look-up Table (LUT),a Triangular Memory Polynomial(TMP) and a Cross Items between Memory Times(CIMT),which are all connected in parallel. PLTC model is applied to model the behavior of the power amplifier model and the digital predistortion . This paper uses the 16 QAM signal to drive a strongly nonlinear Doherty amplifier to verify the performance of the new model. Appling PLTC model in predistortion, PLTC model can reduce the Adjacent Channel Power Ratio (ACPR)by almost 22 dB. Compared with the MP model,GMP model and LMEC model,the result shows that PLTC model can acquire better modeling accuracy and linear effect and can greatly reduce the calculation coefficient.