【摘要】 根据DRM(数字无线电组织)标准,介绍了过采样技术和Hilbert变换的原理,研究了两者在数字AM(调幅)广播中的应用。通过MATLAB仿真,比较了两种方法在AWGN(加性高斯白噪声)信道和Rice衰落信道下的性能。通过比较得到:在AWGN信道和Rice衰落信道下,过采样方法和Hilbert变换法性能完全一样,只是Hilbert变换法要增加一个变换的计算过程,对采样率无特殊要求,FFT(快速傅里叶变换)的点数可以任取,只要满足采样定理即可。更多还原

【Abstract】 This paper introduces the principles of over-sampling technology and Hilbert transform,and introduces also the application of that to digital AM broadcasting.We tested their performance and present the relevant analysis of the system performance in AWGN signal path and Rice Decompose signal path.Comparing them,we draw the conclusion that the performance of AWGN signal path and Rice Decompose signal path is the same.But the Hilbert transform requires adding of its computation time,and it does not require specific sampling rate as long as the condition of sampling criteria is satisfied.更多还原