基于信号分布非均匀量化的IMDD-FBMC系统性能提升  

IMDD-FBMC system performance improvement based on nonuniform quantization of signal distribution

作　　者：林嘉芊 毕美华[1,2] 杨晅 周豪 黄天成 杨国伟[1] 肖石林[2] LIN Jiaqian;BI Meihua;YANG Xuan;ZHOU Hao;HUANG Tiancheng;YANG Guowei;XIAO Shilin(College of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]杭州电子科技大学通信工程学院,杭州310018 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光通信技术》2019年第11期58-62,共5页Optical Communication Technology

基　　金：国家自然科学基金(61501157、61571291、 61705055)资助;浙江省自然科学基金(LY17F050012)资助

摘　　要：针对强度调制直接检测-滤波器组多载波(IMDD-FBMC)系统中低比特位数数字模拟转换器(DAC)量化性能较差的问题,提出一种基于信号分布估计的非均匀量化方案。该方案采用基于FBMC信号分布的非线性规划方法获得量化误差最小时的量化阶距,进而提升基于低比特位数DAC的IMDD-FBMC系统性能。仿真结果表明:与均匀量化方式相比,该方案在3~5位量化比特位数的情况下可以使IMDD-FBMC系统的误码率(BER)性能提升15.9~60.7倍,且在保证系统性能的情况下,基于信号分布的量化方案可以减少1~2位量化比特位数,降低系统成本。Aiming at the poor quantization performance of low bit digital analog converter(DAC)in intensity modulation direct detection-filter bank multi-carrier(IMDD-FBMC)system,a non-uniform quantization scheme based on signal distribution estimation is proposed.The scheme uses the non-linear programming method based on FBMC signal distribution to obtain the quantitative step when the quantization error is minimum,and then improves the performance of IMDD-FBMC system based on low bit DAC.The simulation results show that the proposed scheme can improve the BER performance of the IMDD-FBMC system by 15.9~60.7 times under the condition of 3~5 bit quantization number compared with the uniform quantization scheme,and the quantization scheme based on signal distribution can reduce 1~2 bit quantization number and reduce the system cost under the condition of ensuring the system performance.

关 键 词：光滤波器组多载波 信号分布估计 数字模拟转换器/模拟数字转换器 非均匀量化 

分 类 号：TN914[电子电信—通信与信息系统]