基于LTE下行链路的调制技术的研究.pdfVIP

Asia-Pacific Youth Conference on Communication Technology 2010 (APYCCT 2010) The Study of Modulation Mapping Technology Based on LTE Downlink 1 1 1 2 An-yi Wang , Xiao-qin Ren , Zhao-yang Liu , Wei-jie Ma 1Communication and Information Engineering College Xian University of Science and Technology, Xian, China, 710054 2 Department of Computer Science and ApplicationZhengzhou Institute of Aeronau tical Industry, Zhengzhou, china, 450046 Email: wanganyi@ , @163.com Abstract: LTE physical layer protocol provides QPSK, 16QAM, 64QAM for LTE downlink modulation techniques . To achieve better spectral efficiency ，it is able to choose 64QAM modulation, however, it also will inevitably bring higher error rate, so this paper does some study and analysis of modulation mapping technology.Firstly,we must set up LTE downlink physical layer simulation platform , and make some simula- tion analysis based on this platform , simulation result shows that the BER of QPSK modulation is least ,so QPSK modulation is better than other . Keywords: LTE; downlink; QPSK; 16QAM; 64QAM; BER 基于LTE 下行链路的调制技术研究 1 1 1 2 王安义 ，任晓琴 ，刘朝阳 ，马伟杰 1 西安科技大学通信与信息工程学院，西安，中国，710054 2 郑州航空工业管理学院计算机科学与应用系，郑州，中国，450046 Email: wanganyi@ , @163.com 摘 要: LTE 物理层协议规定了LTE 下行链路的可采用调制技术有QPSK 、16QAM、64QAM。为了获 得更高的频谱利用率我们需要选择高阶调制，然而高阶必然带来高的误码率，因此本论文对此进行了 研究分析，首先进行LTE 物理层下行链路仿真平台的搭建，并在此平台上对基本的调制技术做一个仿 真分析，仿真发现QPSK 调制方式下的误码率最小，因此带来的系统性能好于其它调制方式。 关键词: LTE ；下行链路；QPSK；16QAM；64QAM；误码率 1 引言