Noise-Aided Demodulation With One-Bit Comparator for Multilevel Pulse-Amplitude-Modulated Signals
Noise-Aided Demodulation With One-Bit Comparator for Multilevel Pulse-Amplitude-Modulated Signals
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DOI：
10.1109/lwc.2018.2831683
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发表时间：
2018-04
影响因子：
6.3
通讯作者：
Yasuo Nakashima;T. Yamazato;Shintaro Arai;Hiroya Tanaka;Y. Tadokoro
中科院分区：
文献类型：
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作者：
Yasuo Nakashima;T. Yamazato;Shintaro Arai;Hiroya Tanaka;Y. Tadokoro
这封信提出了一种使用一位比较器对多级脉冲幅度调制 (PAM) 处理的信号进行解调的方法。所提出的方法很简单，并且提供了使用模数转换器来描述多级输入信号的替代方案。由于传输的多电平 PAM 信号中存在噪声，一位比较器的两电平输出显示信号每一电平的不同统计行为。因此，可以基于最大似然准则来检测信号电平或执行符号判定。目前的理论分析表明，如果每个接收符号的两级输出加上有意添加的噪声的概率质量函数已知，即使使用一位比较器，也可以进行可靠的解调。
This letter proposes a demodulation method using a one-bit comparator for signals processed by multilevel pulse amplitude modulation (PAM). The proposed method is simple and provides an alternative to using an analog-to-digital converter to describe multilevel input signals. Because of the noise present in the transmitted multilevel PAM signal, the two-level output of the one-bit comparator shows different statistical behavior for each level of the signal. Thus, it is possible to detect the signal level, or perform symbol decision, based on the maximum likelihood criterion. The present theoretical analysis reveals that reliable demodulation is possible even with a one-bit comparator if the probability mass function of the two-level outputs of each received symbol plus intentionally added noise is known.