Noise-Aided Demodulation with One-Bit ADC for Quadrature Amplitude Modulated Signals
Noise-Aided Demodulation with One-Bit ADC for Quadrature Amplitude Modulated Signals
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DOI：
10.1109/glocom.2018.8648114
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发表时间：
2018-12
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通讯作者：
Yasuo Nakashima;T. Yamazato;Shintaro Arai;Hiroya Tanaka;Y. Tadokoro
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作者：
Yasuo Nakashima;T. Yamazato;Shintaro Arai;Hiroya Tanaka;Y. Tadokoro
本文提出了一种新的解调方法，使用一位模数转换器（ADC）。对于一位分辨率，具有多级信号的信号，例如正交幅度调制（QAM）信号，由于非线性而大大劣化。为了解调信号，使用高分辨率ADC来接收具有高线性度的信号。本研究以一位元类比数位转换器来解调正交振幅调变讯号，此类比数位转换器的解析度是最低的（一位元），并具有二进位（非线性）值的输出。我们建议通过关注结合噪声的一位ADC的输出信号的统计特性来解决这个问题。提出的解调方法是基于最大后验概率（MAP）准则。理论分析表明，可靠的解调是可能的，即使与一位ADC，提供的ADC的输出概率对应于每个发送的符号是已知的。
This paper proposes a new demodulation method using a one-bit analog-to-digital converter (ADC). With one bit resolution, a signal having a multilevel signal, such as a quadrature amplitude modulated (QAM) signal, is largely degraded by nonlinearity. To demodulate the signals, a high- resolution ADC is used to receive the signals with high linearity. This study sets out to demodulate the QAM signals using a one-bit ADC, whose resolution is the lowest (one-bit) and possesses outputs of binary (nonlinear) values. We propose to solve the issue by focusing on the statistical characteristics of the output signals of the one-bit ADC combined with noise. The proposed demodulation method is based on maximum a posteriori (MAP) criterion. The theoretical analysis presented illustrates that reliable demodulation is possible even with the one-bit ADC, provided the output probability of the ADC corresponds to each transmitted symbol is known.