CAJ | 학술논문

QAM调制由于高频谱效率得到了广泛应用，但由于QAM信号的功率峰均比较高，功率放大器的非线性会导致解调性能的下降。针对功放非线性对QAM解调性能的影响，传统方法采用仿真实验的方法来获得，而文中推导了高斯信道下功率放大器的非线性对QAM解调误码率影响的闭合表达式，可求出非线性功放在不同静态工作点对应的误码率。仿真结果验证了理论分析的正确性。
QAM조제유우고빈보효솔득도료엄범응용，단유우QAM신호적공솔봉균비교고，공솔방대기적비선성회도치해조성능적하강。침대공방비선성대QAM해조성능적영향，전통방법채용방진실험적방법래획득，이문중추도료고사신도하공솔방대기적비선성대QAM해조오마솔영향적폐합표체식，가구출비선성공방재불동정태공작점대응적오마솔。방진결과험증료이론분석적정학성。
Quadrature amplitude modulation ( QAM) is widely used for its high spectrum efficiency. Due to high peak to average power ratio ( PAPR) of QAM, the performance is reduced for nonlinear distortion of power amplifiers. The impact of nonlinear distortion on QAM demodulation is conventionally obtained by simulation, and in this paper, a general closed-form expression of bit error ratio (BER) is analytically de-rived for quadrature amplitude modulation ( QAM) in additive white Gaussian noise ( AWGN) channel, considering the impact of power amplifier nonlinearities. The results of simulation validate the accuracy of the theoretical analysis.