摘要
利用NMSK(N重最小频移键控)的旁瓣快速衰减特性,提出了一种新型OFDM-NMSK编码调制体系用于降低OFDM认知无线电系统的带外干扰。该方法仅通过关闭干扰频段上的相应NMSK子载波,能够快速生成符合要求的频谱凹槽深度,从而实现与其地窄带系统的共存。理论与仿真表明,与传统的相邻频带编码(AFC)方法相比,OFDM-NMSK编码效果更佳。
Based on the fast roll-off sidelobe spectral property of N minimum-shift keying （NMSK）, a novel OFDM-NMSK coded modulation scheme for cognitive radio （CR） OFDM systems is proposed to mitigate the out-of-band interference, By closing NMSK sub-carriers in the interfering frequency bands, it can create the required frequency notch rapidly. Therefore, the coexistence with other narrow band radio services can be realized. Theoretic analysis and simulation results show that the OFDM-NMSK coding effect outperforms that of the traditional adjacent frequency coding （AFC）.
出处
《电子技术应用》
北大核心
2012年第9期110-113,共4页
Application of Electronic Technique
基金
云南省社会发展科技计划(2009CA027)
