高速卫星通信终端数字预失真补偿技术研究  

Research on Technologies of Radar and Communication Integration

作　　者：韩晓娱[1] 尹曼[1] HAN Xiaoyu;YIN Man(The 54th Research of China Electronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《电声技术》2023年第3期149-152,共4页Audio Engineering

摘　　要：数字预失真补偿技术是解决宽带卫星系统功率、带宽资源矛盾的关键技术之一,Ka频段宽带预失真技术受器件、速率等因素限制实现难度较大。考虑记忆效应和通带非线性的等效离散Ka宽带功放建模,采用单位延迟抽头的多项式模型。宽带预失真算法采用间接学习自适应预失真算法。搭建基于宽带通用调制解调器的多项式拟合预失真验证系统,并完成实验验证。采用正交相移键控(Quadrature Phase Shift Keying,QPSK)体制,当解调损失在误码率为10-7时,比特能量噪声功率谱密度比(Eb/N0)与理论值相差1.4 dB,比未加预失真器时改善了2 dB,有效降低了功放非线性对通信信号的影响。高速卫星通信终端数字预失真补偿技术大幅降低了系统实现规模和功耗,提升了高速数据传输系统的性能,可支持星载宽带系统的设计实现。Digital predistortion compensation technology is one of the key technologies to solve the contradiction between power and bandwidth resources of broadband satellite system.Ka-band broadband predistortion technology is difficult to realize due to the limitations of devices,speed and other factors.Considering the memory effect and passband nonlinearity,the equivalent discrete Ka broadband power amplifier is modeled by polynomial model with unit delay tap.The wideband predistortion algorithm adopts indirect learning adaptive predistortion algorithm.A polynomial fitting predistortion verification system based on broadband universal modem is built,and the experimental verification is completed.Quadrature Phase Shift Keying(QPSK)system is adopted.When the demodulation loss is 10-7,the power spectral density ratio of bit energy to noise(E/No)is 1.4 dB different from the theoretical value,which is 2 dB better than that without predistorter,and the influence of power amplifier nonlinearity on communication signals is effectively reduced.Digital predistortion compensation technology of high-speed satellite communication terminal greatly reduces the scale and power consumption of the system,improves the performance of high-speed data transmission system,and can support the design and implementation of on-board broadband system.

关 键 词：预失真补偿 宽带功放 调制解调技术 

分 类 号：TN722.75[电子电信—电路与系统] TN791