基于极化状态—幅度—相位调制的高效无线传输方案

An efficient polarization-amplitude-phase modulation scheme for wireless communication

本文提出一种基于极化状态—幅度—相位调制(polarization-amplitude-phase modulation,PAPM)的高效无线传输方案,该方案可在传统幅度—相位调制的基础上对载波的极化状态进行调制,进一步提高传输效率.本文量化分析了无线信道极化相关衰减效应对所提方案造成的功率衰减及极化星座失真,并且提出了对抗该极化相关衰减效应影响的预补偿算法.在此基础上,推导了PAPM误符号率函数,并建立了该误符号率函数关于调制因子的优化模型.为使PAPM误符号率最小,计算了最优调制因子并分析了其分布规律.最后,基于软件无线电平台,建立了基于PAPM的原型通信系统,并在实际的信道环境中对PAPM的误符号率及频谱效率进行了实验.实验结果表明,相比传统移相键控调制(phase shift keying,PSK)及正交幅值调制(quadrature amplitude modulation,QAM),PAPM易受信道极化相关衰减效应的影响,但是经过预补偿后,其误符号率及频谱效率性能具有明显的优势.

A polarization-amplitude-phase modulation（PAPM） scheme for wireless communication is proposed to further improve spectrum efficiency. Through the proposed scheme, each carrier＇s polarization state, amplitude,and phase can each carry transmitting data. Impairment of PAPM because of the wireless channel＇s polarizationdependent loss effect is analyzed. To mitigate this impairment, a pre-compensation algorithm is also presented;the PAPM＇s symbol error rate（SER） is also derived on the basis of the proposed pre-compensation. Furthermore,to minimize the PAPM＇s SER, a SER optimization model is established and the optimal modulation ratio, which is defined as the ratio of the data rate achieved by the polarization state to the amplitude-phase, is calculated.Finally, both numerical simulations and experimental results show that PAPM can significantly improve SER and spectrum efficiency performance compared with the traditional PSK and QAM schemes.