有混叠的采样下信号恢复理论研究

Research for restore theorem of signal with aliasing sampling

现代通信系统中传输的多是数字调制信号,对数字调制信号的采样数字化问题的研究变得越来越重要。本文提出了对于数字调制问题的采样及重建信号具有特殊性的思想,即数字调制信号的恢复不需要重建波形,而只要恢复原码元序列即可。因此,对于这种信号的采样及重建问题可以超越传统的香农采样定理的限制,以更低的频率采样,在频谱有混叠的情况下恢复码元序列。对所提理论进行了论证和计算机仿真。

Now in modern communicationsystem the digital modulation signal is transmitted mostly,the research on sampling and digitization of digital modulation signal becomes more and more important.This article proposed a thought that sampling and reconstruction of digital modulation signal has particularity,which is the restoration does not need to reconstruct wave,but to recover the code.Therefore,due to the problem of this kind of signal,we can beyond the limit of conventional sampling theorem,sampling by a lower...