非对称单边带矢量毫米波信号非均匀调制分析  

Non-uniform modulation analysis of asymmetric single sideband vector millimeter wave signal

作　　者：孟佳欣 赵峰 魏怡 刘君 姜长鹏 王凡允 MENG Jiaxin;ZHAO Feng;WEI Yi;LIU Jun;JIANG Changpeng;WANG Fanyun(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an,Shaanxi 710121,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《光电子．激光》2021年第10期1030-1038,共9页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61875164)资助项目。

摘　　要：非对称单边带矢量毫米波可以有效节省频谱带宽,非均匀调制通过优化星座间的欧氏距离、能够有效克服信道的非线性效应,从而提高传输系统的信噪比。提出了一种采用非均匀调制产生非对称单边带矢量毫米波信号的方案,在VPI和MATLAB环境下,使用广义成对优化算法对基于I/Q调制器产生W波段矢量毫米波信号开展了几何整形理论分析和仿真验证。在高斯信道条件下,首先仿真分析了非均匀几何整形星座相比于传统均匀星座带来的互信息增益,然后比较研究了背靠背(back-to-back,BTB)传输和光纤远距离传输情况下系统采用8PSK非均匀调制格式带来的整形增益。结果表明:在BTB传输和光纤远距离传输系统中,几何整形后的信号的误码率性能总是优于未整形的信号,光功率至少提升了0.5 dBm。The asymmetric single-sideband modulated vector millimeter waves can effectively improve the spectrum efficiency,and the non-uniform modulation can effectively overcome the nonlinear effect of the channel by optimizing the Euclidean distance between these constellations,so as to improve the signal-to-noise ratio of the transmission system.A scheme of asymmetric single sideband modulated vector millimeter wave signal generation by non-uniform modulation is proposed.Under the development environments of VPI and MATLAB,the theory analysis and simulation verification of geometric shaping on a W-band vector millimeter wave signal which generated by a single I/Q modulator are carried out by using generalized paired optimization algorithm.In Gaussian channel,firstly,the mutual information gain of the non-uniform geometric shaping constellation and the traditional uniform constellation are compared by simulated analysis in detailly,and then,the shaping gain brought by the 8 PSK non-uniform modulation format in back-to-back(BTB)transmission and optical fiber long-distance transmission conditions are compared.The results show that th bit error rate(BER)performance of the geometrically shaped signal is always better than that of the unshaped signal in BTB transmission and optical fiber long-distance transmission systems,and the optical power is increased by 0.5 dBm at least.

关 键 词：光纤承载射频通信 非均匀调制 几何整形 广义成对优化算法 单边带调制 

分 类 号：TN928[电子电信—通信与信息系统]