自适应OFDM调制结构优化设计  

Adaptive OFDM modulation structure optimization design

作　　者：梁燕[1] 李倩 王光宇[1,2] 邵凯[1,2] 陈峻嵩[1] LIANG Yan;LI Qian;WANG Guangyu;SHAO Kai;CHEN Junsong(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China;Chongqing Key Laboratory of Mobile Communications Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学移动通信技术重庆市重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2022年第2期303-310,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：为了提高调制结构快速灵活配置能力,针对未来移动通信系统业务多样化以及用户业务切换快速灵活的要求,基于离散余弦变换提出了自适应正交频分复用调制结构(AOFDM)。AOFDM通过分段配置原型函数,调节子载波数以及滤波器长度,保证调制波形在用户传输业务切换过程中自适应转换而无需中断传输。仿真分析表明,AOFDM具有很好的频谱收敛特性和峰均功率比性能,可以做到快速灵活的无缝切换,并能保证调制结构在信息切换前后的完全重建;在传输信道影响情况下,AOFDM的误码率性能相比于OFDM系统无明显的损失。In order to improve the fast and flexible configuration ability of the modulation system, this paper proposes an adaptive orthogonal frequency division multiplexing(AOFDM) modulation system based on discrete cosine transform to meet the diversity requirements of the future mobile communication system service and user service. The proposed modulation structure adjusts the number of subcarriers and the length of the filter by configuring the prototype function in sections, so as to ensure the adaptive conversion of the modulation waveform during the switching process without interrupting the transmission. Through simulation and analysis of the prototype function’s spectrum change and system error rate, the AOFDM has good spectrum convergence characteristics and peak-to-average power ratio performance. It can not only achieve fast and flexible seamless switching, but also ensure the transmitted information completely reconstructed during the switching. Under the influence of the transmission channel, the bit error rate performance of AOFDM has no obvious loss compared with the OFDM system.

关 键 词：时变性 离散余弦变换 业务切换 第六代移动通信系统 

分 类 号：TN911.3[电子电信—通信与信息系统]