EBPSK调制的波形优化  

Optimization of extended BPSK modulated waveforms

作　　者：张士凯[1] 吴乐南[1] 

机构地区：[1]东南大学信息科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2008年第4期564-568,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(60472054);江苏省自然科学基金资助项目(BK2007103);国家高技术研究发展计划(863计划)资助项目(2008AA01Z227)

摘　　要：为使调制波形适应不同信道条件,利用扩展的二元相移键控(EBPSK)功率谱结构及特性对其基本波形进行优化,得到带宽更窄、边带抑制水平更好的EBPSK调制波形.通过修改基本调制波形表达式,控制已调信号功率谱中线谱的分布.在波形结构表达式中引入波控参数α,通过调节该参数,可以自由控制边带抑制水平及载波强度,以适应不同信道干扰条件,实现自适应调制.选择合适的调制指数及波控参数α,可以使边带低于-60dB,因而,可利用现有的频谱间隙实现混合调制,共享频谱,提高频谱效率.To adapt different channel conditions, based on the composition and characteristics of its modulated signals and power spectra, the waveform optimization to extended binary phase shift keying （EBPSK） is proposed, and the advanced modulated signals with narrower bandwidth and lower sidebands are obtained. Line spectrum components of power spectral density for EBPSK modulated wave can be controlled and tailored by changing the basic modulation waveform expression. Waveform control parameter α is introduced in the waveform structure expression. By regulating the parameter, the sideband and carder can be controlled easily to adapt to different channel conditions. By selecting proper modulation index and waveform control parameter, EBPSK modulated signals sideband can be lower than -60 dB. Therefore, hybrid modulation can be realized by using allocated spectrum interspaces to achieve spectrum sharing and improve spectrum efficiency.

关 键 词：扩展的二元相移键控 功率谱 带宽 波形优化 

分 类 号：TN911.7[电子电信—通信与信息系统]