摘要
非正弦时域正交调制体制的实现依赖于脉冲组间的正交性,而传输系统的非理想幅频和相频特性会破坏该正交性,影响正确解调。针对这一问题,从系统的频率响应入手,理论分析了保持脉冲组时域正交性的条件,分别采用综合法、牛顿插值法和埃尔米特插值法对传输系统的频域特性进行均衡,并仿真比较了均衡前后系统的幅相特性及对误码率特性的影响。仿真结果表明,基于埃尔米特插值的频域均衡算法,在传输系统幅频、相频特性方面均衡效果最佳,且使系统误码率性能得到很大改善。
The realization of time domain non-sinusoidal orthogonal modulation system relies on the orthogonality of pulses.However,the non-ideal amplitude and phase characteristic will destroy the orthogonality and affect the correct demodulation.To solve this problem,the condition for keeping the orthogonality is analyzed in the frequency domain.Synthetic method,Newton interpolation and Hermite interpolation are used to equalize the frequency characteristic of the transmission system respectively.The characteristics before and after the equalization and the effects on the error rate,are simulated.Our results show that the frequency equalization algorithm based on Hermite interpolation works best,and it improves the error rate performance greatly.
出处
《中国电子科学研究院学报》
2010年第3期291-296,共6页
Journal of China Academy of Electronics and Information Technology
基金
"泰山学者"建设工程专项
关键词
非正弦时域正交调制
椭圆球面波函数
频域均衡
插值
non-sinusoidal time domain quadrature modulation
Prolate Spheroidal Wave Functions
frequency equalization
interpolation
