甚小线性调频键控调制波形的正弦基拟合优化  

Optimization of Very Minimum Chirp Keying Modulation Waveforms Based on Sinusoidal Basis Fitting

作　　者：贾东立[1,2] 郑国莘[1] 张立[1] 朱亚洲[1] 

机构地区：[1]上海大学特种光纤与光接入网省部共建重点实验室,上海200072 [2]河北工程大学信息与电气工程学院,河北邯郸056038

出　　处：《上海大学学报（自然科学版）》2010年第4期331-335,共5页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(60872021);上海市重点学科建设资助项目(S30108);上海市科委重点实验室资助项目(08DZ2231100)

摘　　要：甚小线性调频键控(very minimum chirp keying,VMCK)是一种高效的超窄带调制技术,具有窄带宽占用、强边带抑制、数据传输效率高等优点.但是,从VMCK的表达式不能得出其频谱结构的解析解,难以对信号进行进一步分析和优化.基于数值拟合原理,提出一种基于正弦基拟合分解的VMCK优化方案.理论分析和仿真结果表明,该方案可成功去除VMCK谐波线谱,得到带宽更窄、边带抑制更强的VMCK波形,信号的解调性能也可以得到进一步增强.Very minimum chirp keying （VMCK） is a novel ultra narrow band modulation method with the advantages of narrow band occupancy, intensive sideband suppression, and high transmission efficiency. However, since an analytical solution of the VMCK spectrum cannot be obtained directly, further optimization is limited. This paper presents a VMCK modulation optimization scheme based on sinusoidal basis fitting. The theoretical analysis and simulation show that the proposed scheme can successfully remove harmonic spectral lines and obtain an optimized VMCK waveform with narrower bandwidth and lower sidebands, and good demodulation performance.

关 键 词：甚小线性调频键控 正弦基拟合 波形优化 

分 类 号：TN911.7[电子电信—通信与信息系统]