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| 可用于高阶调制的伪正交载波干涉MC-CDMA方案 | |
| 引用本文： | 张炎炎,陶小峰,朱晓暄. 可用于高阶调制的伪正交载波干涉MC-CDMA方案[J]. 北京邮电大学学报, 2007, 30(4): 14-18 |
| 作者姓名： | 张炎炎 陶小峰 朱晓暄 |
| 作者单位： | 1.北京邮电大学 泛网无线通信教育部重点实验室， 北京 100876; 2.KDDI电信研发中心， 横须贺 2390847 |
| 基金项目： | 国家自然科学基金，北邮-KDDI合作项目，教育部跨世纪优秀人才培养计划 |
| 摘 要： | 通过对伪正交载波干涉（PO CI）序列在不同调制方式下扩频解扩原理的分析，论证了其在复信号高阶调制（如四相移相键控（QPSK）、正交幅度调制（QAM）等）下无法正确解码，在此基础上提出了一种可行的扩频调制结构. 该结构结合PO CI扩频码，使用脉冲幅度调制（PAM）方式取代通常使用的复信号调制方式，能在仅有很小性能损失且不增加系统带宽的条件下，将传统多载波码分多址接入（MC CDMA）系统容量提高2倍. |
| 关 键 词： | 伪正交载波干涉； 脉冲幅度调制； 扩频/解扩； 多载波码 分多址接入； 系统容量 |
| 文章编号： | 1007-5321（2007）04-0014-05 |
| 收稿时间： | 2006-09-06 |
| 修稿时间： | 2007-05-18 |
A PO-CI/MC-CDMA Scheme for High Modulation Styles |
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| ZHANG Yan-yan,TAO Xiao-feng,ZHU Xiao-xuan,YAMAMOT Toshiaki. A PO-CI/MC-CDMA Scheme for High Modulation Styles[J]. Journal of Beijing University of Posts and Telecommunications, 2007, 30(4): 14-18 | |
| Authors: | ZHANG Yan-yan TAO Xiao-feng ZHU Xiao-xuan YAMAMOT Toshiaki |
| Affiliation: | 1.Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China; 2.KDDI Research & Development Labs, Yokosuka Kanagawa 2390847, Japan |
| Abstract: | Through theoretical spreading principle analysis,it is proved that the benefit of pseudo-orthogonal carrier interferometry(PO-CI) spreading code is not able to be supported when complex signal modulation(for example,quadrature phase-shift keying(QPSK) and quadrature amplitude modu-lation(QAM)) types are employed.On this basis,a feasible structure for its solution is brought forward.Within the structure mentioned,instead of complex modulation patterns,pulse amplitude mo-dulation(PAM) combined with PO-CI spreading code is utilized,it manages to maintain the doubled throughput increase of multi-carrier code division multiple access(MC-CDMA) system with minimal loss in performance and no bandwidth expansion. |
| Keywords: | pseudo-orthogonal carrier interferometry pulse amplitude modulation spreading/despreading multi-carrier code division multiple access doubled throughput |
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