频谱重叠因子对数字调制系统的性能影响分析  

Effect of the spectrum overlap factor on digital modulation systems

作　　者：郭黎利[1] 李清伟[1] 戴佳 刘湘蒲[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2016年第4期619-624,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(61271263)

摘　　要：一般数字调制系统的性能分析都是在信号、噪声统计规律的基础上,通过时域的数学方法进行的,但针对目前和未来复杂通信环境(如认知无线电系统的授权用户规避、窄带或宽带干扰影响等问题),经典的分析方法尚不能准确、定量的描述数字调制系统的误码率性能。该论文从频域分析的角度出发,提出了频谱重叠因子(spectrum overlap factor,SOF)的概念,推导并修正了干扰存在下经典的2ASK、BPSK和FSK调制方式的误码率公式。在证实直观物理意义的基础上,给出了定量的数学描述。实验仿真结果验证了频域分析的正确性。General performance analysis of a digital modulation system was performed mathematically in the time domain considering the statistical regularity of signal and noise. However,the performance of such a system cannot be accurately and quantitatively described for complex traffic environments by using the classical method. The difficulties encountered in doing so include the problems of avoiding narrow or wideband interferences and authorized users in the cognitive radio（ CR） currently and in the future. To mitigate these problems,we propose the use of the spectrum overlap factor（ SOF） for performance analysis of digital modulation systems in the frequency domain. Classical bit error rate（ BER） expressions of 2ASK,BPSK,and FSK modulation are derived and revised. A quantitative mathematical description is given by verifying the intuitive physical significance which means that the spectrum overlap worsens the system performance. The validity of the analysis in the frequency domain was confirmed by simulation.

关 键 词：误码率 时域分析 授权用户 频谱重叠因子(SOF) 数字调制 频域分析 

分 类 号：TN911.6[电子电信—通信与信息系统]