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首页> 外文期刊>Journal of circuits, systems and computers >Design of Robust Quantizers for Low-Bit Analog-to-Digital Converters for Gaussian Source*
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Design of Robust Quantizers for Low-Bit Analog-to-Digital Converters for Gaussian Source*

机译：高斯源低位模数转换器的稳健量化器设计*

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摘要

This paper considers the design of robust logarithmic mu-law companding quantizers for the use in analog-to-digital converters (ADCs) in communication system receivers. The quantizers are designed for signals with the Gaussian distribution, since signals at the receivers of communication systems can be very well modeled by this type of distribution. Furthermore, linearization of the logarithmic mu-law companding function is performed to simplify hardware implementation of the quantizers. In order to reduce energy consumption, low-resolution quantizers are considered (up to 5 bits per sample). The main advantage of these quantizers is high robustness - they can provide approximately constant SNR in a wide range of signal power (this is very important since the signal power at receivers can vary in wide range, due to fading and other transmission effects). Using the logarithmic mu-law companding quantizers there is no need for using automatic gain control (AGC), which reduces the implementation complexity and increases the speed of the ADCs due to the absence of AGC delay. Numerical results show that the proposed model achieves good performances, better than a uniform quantizer, especially in a wide range of signal power. The proposed low-bit ADCs can be used in MIMO and 5G massive MIMO systems, where due to very high operating frequencies and a large number of receiving channels (and consequently a large number of ADCs), the reduction of ADC complexity and energy consumption becomes a significant goal.
机译：本文考虑了用于通信系统接收器中的模数转换器（ADC）的健壮对数mu-law压扩量化器的设计。量化器是为具有高斯分布的信号而设计的，因为通信系统接收器处的信号可以通过这种分布很好地建模。此外，执行对数mu-law压扩函数的线性化以简化量化器的硬件实现。为了减少能耗，考虑使用低分辨率量化器（每个样本最多5位）。这些量化器的主要优点是鲁棒性强-它们可以在宽范围的信号功率中提供近似恒定的SNR（这非常重要，因为由于衰落和其他传输效应，接收器处的信号功率可以在宽范围内变化）。使用对数mu-law压扩量化器，无需使用自动增益控制（AGC），由于没有AGC延迟，因此可以降低实现复杂度并提高ADC的速度。数值结果表明，该模型具有良好的性能，优于均匀量化器，尤其是在较宽的信号功率范围内。提议的低位ADC可以用于MIMO和5G大规模MIMO系统中，由于很高的工作频率和大量的接收通道（因此有大量的ADC），降低了ADC的复杂性和能耗一个重要的目标。

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