电讯技术2017，Vol.57Issue(7)：772-777,6.DOI:10.3969/j.issn.1001-893x.2017.07.007
一种适用MBMS业务的改进型分层调制方案
An Improved Hierarchical Modulation Scheme for MBMS Systems
摘要
Abstract
Hierarchical modulation is an important key technology in multimedia broadcast multicast service(MBMS) system.Generic layered modulation interference between the base layer and the enhancement layer,results in the increase of hierarchical modulation error rate.This paper proposes an improved hierarchical modulation.Firstly,the constellation of data in basic layer and enhancement layer is rotated,and then the phase modulation signals and their orthogonal part are woven.Finally,the signal space gain is obtained by optimal rotation angle searching with the same transmitting device.Simulated experimental results show that the constellation signal of the enhancement layer after rotation is superior to that of traditional enhancement layer.It is simple and effective to solve the optimal rotation angle with the use of approximate method.In addition,different character error rates can be got by changing the rotation angle between the basic and enhancement layer within 0o~45o,which provides a basis support for further obtaining the optimal rotation angle.关键词
多媒体广播多播服务(MBMS)/分层调制/星座旋转/矩阵旋转/交织技术Key words
multimedia broadcast multicast service(MBMS)/hierarchical modulation/constellation rotation/matrix rotation/interleaving technique分类
信息技术与安全科学引用本文复制引用
张永棠,黄中友..一种适用MBMS业务的改进型分层调制方案[J].电讯技术,2017,57(7):772-777,6.基金项目
国家自然科学基金资助项目(61363047) （61363047）
佛山市科技创新项目(2016AG100382) （2016AG100382）
