A CLASS OF BAND-LIMITED CHIP WAVEFORMS FOR DS-CDMA SYSTEMS  

作　　者：Song Rongfang Bi Guangguo Xie Daxiong 

机构地区：[1]Dept of Telecommun., Nanjing University of Posts and Telecommun., Nanjing 210003, China [2]Department of Radio Engineering, Southeast University, Nanjing 210096, China [3]ZTE Corporation, Shenzhen 518057, China

出　　处：《Journal of Electronics(China)》2007年第1期10-15,共6页电子科学学刊（英文版）

基　　金：Supported by University Natural Science Research Pro-ject of Jiangsu (No.03KJB510088);National Natural Science Foundation of China (No.60572130).

摘　　要：In Direct Sequence Code Division Multiple Access (DS-CDMA) systems,the chip wave-form affects the implementation,system bandwidth,envelope uniformity,eye pattern and Multiple user Access Interference (MAI). In this paper,based on an elementary density function of a second order polynomial,a class of second order continuity pulses is proposed. From this class of pulses,we can find some members having faster decaying rate,bigger eye opening,more uniform envelope and stronger anti-MAI capability than the Nyquist waveform. The normalized-bandwidth-pulse-shape-factor product,the decaying rate of the tail of the time waveform,the opening of the eye diagram,and the envelope uniformity of the second order continuity pulses are addressed in the paper that provide the basic information for the selection of the chip pulse for CDMA systems.In Direct Sequence Code Division Multiple Access （DS-CDMA） systems, the chip waveform affects the implementation, system bandwidth, envelope uniformity, eye pattern and Multiple user Access Interference （MAI）. In this paper, based on an elementary density function of a second order polynomial, a class of second order continuity pulses is proposed. From this class of pulses, we can find some members having faster decaying rate, bigger eye opening, more uniform envelope and stronger anti-MAI capability than the Nyquist waveform. The normalized-bandwidth-pulseshape-factor product, the decaying rate of the tail of the time waveform, the opening of the eye diagram, and the envelope uniformity of the second order continuity pulses are addressed in the paper that provide the basic information for the selection of the chip pulse for CDMA systems.

关 键 词：Chip waveform Direct Sequence Code Division Multiple Access （DS-CDMA） Eye diagram Envelope uniformity 

分 类 号：TN914.53[电子电信—通信与信息系统]