MC-CDMA系统载频偏移性能分析

Carrier Frequency Offset Performance Analysis and Simulation on MC-CDMA System

讨论了在载波频率偏移作用下MC CDMA系统的误码性能。分别研究系统接收端采用ORC检测技术和EGC检测技术两种情形下存在载频偏移时干扰的类型和数量,进而研究载频偏移对系统信噪比和误码率的影响。最后用MATLAB进行仿真,结果表明MC CDMA系统的性能对于即使是相对很小的频率偏移也是非常敏感的;由于载频偏移引起的系统性能下降不仅与频率偏移量有关,而且与子载波数和用户数有关。

Bit error probability of an MCCDMA(MultiCarrier Code Division Multiple Access) system is considered taking into account of carrier frequency offset. We investigate the amount and the type of interference caused by carrier frequency offset when the receiver uses ORC technique and EGC technique respectively. Then we study the effect of carrier frequency offset on the signaltonoise ratio and bit error ratio of the system. Finally we simulate the performance of the system using MATLAB.The results show that the performance of an MCCDMA system is sensitive even to a relatively small degree of carrier frequency offset. The degree of degradation due to carrier frequency offset is a function of not only the degree of frequency offset but also the number of subcarriers and the number of users.