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MC-CDMA系统载波同步性能分析与仿真
引用本文:张登银,乔丽霞.MC-CDMA系统载波同步性能分析与仿真[J].解放军理工大学学报,2003,4(5):5-10.
作者姓名:张登银  乔丽霞
作者单位:南京邮电学院计算机科学与技术系 江苏南京210003 (张登银),南京邮电学院计算机科学与技术系 江苏南京210003(乔丽霞)
基金项目:国家 8 63计划资助项目 (2 0 0 2 AA712 0 3 4),广东省自然科学基金资助项目 (2 0 0 0 164 1)
摘    要:将载波同步误差综合到端到端的系统传递函数中,得到一个等效时变滤波器,进而分析载波同步误差对MC—CDMA系统性能的影响,给出了系统接收信噪比和误码率公式,并对载频偏移、载波相位抖动、时钟频率偏差及定时抖动对系统信噪比下降和比特误码率的影响做了全面、细致的分析与仿真。仿真结果验证了理论分析得出的结论,即MC—CDMA系统对载波同步误差非常敏感。在载波频率偏移或时钟频率偏移作用下,系统性能呈迅速下降趋势,并且严重依赖于载波数量。

关 键 词:多载波  码分多址  信噪比  误码率
文章编号:1009-3443(2003)05-0005-06

Carr ier Synchronous Performance Ana lysis and Smi ulat ion ofMC-CDMA System
ZHANG Deng-yin and QIAO Li-xia.Carr ier Synchronous Performance Ana lysis and Smi ulat ion ofMC-CDMA System[J].Journal of PLA University of Science and Technology(Natural Science Edition),2003,4(5):5-10.
Authors:ZHANG Deng-yin and QIAO Li-xia
Institution:Department of Computer Science and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China;Department of Computer Science and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
Abstract:Carrier synchronization errors are incorporated in the end-to-end transfer function and a time-varying equivalent filter is obtained. Then the synchronous performance of MC-CDMA system has been analyzed by means of the time-varying equivalent filter. The expressions of signal-to-noise ratio (SNR) and bit-error-ratio (BER) are presented and the effect of carrier frequency offset, carrier phase jitter, clock frequency offset and timing jitter on degradation of SNR and BER is analyzed and simulated thoroughly and precisely. Finally, academic conclusions are testified by computer simulation whose results show that the performance of MC-CDMA system is very sensitive to synchronization errors. The MC-CDMA performance in the presence of a carrier frequency offset or a clock frequency offset is a rapidly decreasing function of the number of carriers.
Keywords:multi-carrier  CDMA  SNR(Signal to Noise Ratio)  BER(Bit Error Ratio)
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