摘要
m序列因其优良的二值自相关特性而广泛应用于雷达和通信系统中。存在符号调制时 ,m序列匹配接收的旁瓣特性不再具有二值性。研究表明 :对于生成多项式相同的m序列 ,当移位寄存器的初始状态不同时 ,其符号调制下的旁瓣特性存在明显差异。选择合适的初始状态 ,可以得到较高的主旁瓣比。
The m sequences are popularly used in radar and communication systems because of its character of uniform auto correlation sidelobes.The sidelobes of the m sequences are not bilevel any more when the m sequences are modulated by the symbols.Researches reveal that the sidelobes of the m sequences can be greatly different given the same generator polynominal but different initial phase modulation. The ratio of mainlobes to sidelobes can be increased by choosing special initial phase modulation and even more increased when the mismatched filter is adopted. The features of the matched and mismatched filters are discussed when the inputting m sequences are modulated by the symbols.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2002年第3期55-59,共5页
Journal of National University of Defense Technology
基金
国家部委基金资助 (D99 2 1)
