摘要
为了对具有微小波形差的超窄带EBPSK调制信号进行检测,提出了一种特殊的共轭零极点滤波器.该滤波器可将调制的相位信息转化为幅度信息,产生上凸或下凹现象.通过分析分解波形的滤波响应,运用叠加原理对该滤波器产生的特殊现象进行了定性的解释;利用频率响应的相频特性表达式对其进行了直观分析.实验结果表明:利用零极点滤波器产生的寄生调幅现象可以采用门限判决,从而简化了EBPSK系统接收机结构,仿真的误码率曲线表明了该滤波器对EBPSK传输系统性能有很大的提升作用.
In order to detect the EBPSK(extended binary phase shift keying) modulation signal with very tiny waveform difference,a special conjugate pole-zero filter is proposed,which can transform the phase information into amplitude information,resulting in up convex or down concave.By analyzing the filter response of decomposition waveform,the special phenomenon produced by the filter is qualitatively interpreted using the superposition principle,and a visual analysis is given by the expression of the phase-frequency characteristics.The simulation results show that the simple threshold decision can be used according to the phenomena of parasitical amplitude modulations,which simplifies the EPBSK receiver structure.The BER(bit error rate) curve indicates that this filter may achieve a great improvement in the performance of the EBPSK transmission system.
出处
《东南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2010年第2期227-230,共4页
Journal of Southeast University:Natural Science Edition
基金
国家自然科学基金资助项目(60872075)
国家高技术研究发展计划(863计划)资助项目(2008AA01Z227)
江苏省博士后科研计划资助项目(0802005B)
中国博士后科学基金资助项目(20080441015)
关键词
扩展的二元相移键控
数字滤波器
寄生调幅
矢量法
频率响应
EBPSK(extended binary phase shift keying)
digital filter
parasitical amplitude modulation
vector method
frequency response