WCDMA上行链路I/Q星座图形成原理研究  

Analysis of the principle for I/Q constellation formation on WCDMA uplink

作　　者：胡蓉[1] 冯志宇[2] 

机构地区：[1]重庆邮电大学移通学院,重庆401520 [2]重庆邮电大学光电工程学院,重庆400065

出　　处：《数字通信》2013年第3期57-59,69,共4页Digital Communications and Networks

基　　金：重庆邮电大学自然科学基金项目(A2011-15)

摘　　要：针对工程研发实践测试中WCDMA(wideband code division multiple access)系统的反向信道物理层QPSK(quadrature phase shift keying)调制星座图与理论描述上有偏差的问题,经过详细研究,发现WCDMA上行链路的调制方式不是真正意义上的QPSK,I/Q路调制幅度不一样。对WCDMA系统中的物理层正交调制方式的星座图形成机制进行了形象直观的解释,提出WCDMA上行链路的物理调制过程本质上是多幅度的正交调制,解决了其QPSK星座图与其调制原理描述情形不一致的问题。对WCDMA了解不深的学生、工程人员在学习和实践中理解其星座图形成原理具有实际参考价值。Considering the deviation between QPSK modulation constellation and the description in theory in reverse channel physical layer in WCDMA system during engineering research and practice, we find that the modulation on WCDMA uplink is not QPSK in the true sense of words and the modulation amplitude of I/Q is also different after a detailed study. In the paper, we explained the mechanism for forming constellation with orthogonal modulation in physical layer in WCDMA system, proposed that the physical modulation process on WCDMA uplink is multi-amplitude orthogonal modulation in nature and resolved the issue that QPSK constellation is inconsistent with its modulation principle. It is helpful to understand the formation principle of constellation for the students and engineering staff who do not know much about WCDMA during studying and practice.

关 键 词：WCDMA 上行链路 QPSK 星座图 

分 类 号：TN929.533[电子电信—通信与信息系统]