论文标题
无线通信的深层模数转换器
Deep Analog-to-Digital Converter for Wireless Communication
论文作者
论文摘要
随着5G无线网络的出现,每秒吞吐量达到了数十千兆,毫秒低,潜伏期已成为现实。这种级别的性能将助长许多实时应用,例如自主性和增强现实,在云中可以执行计算沉重的任务。带宽的增加以及使用致密星座的使用,使类似于数字转换器(ADC)的速度和准确性承担重大负担。创建宽带ADC的一种流行方法是利用多个以较低速度运行的多个通道,以时间间隔的方式运行。但是,交错的ADC带有其自身的挑战。并行架构对渠道间的不匹配,时机抖动,时钟偏斜以及各个通道内的非线性非常敏感。因此,使用ADC后使用数字信号处理(DSP)需要进行复杂的后校准。传统的DSP校准会消耗大量功率,其设计需要了解错误的源和类型,这些错误和类型在纳米CMOS过程中变得越来越难以预测。在本文中,我们使用深度学习算法来学习完整而复杂的ADC行为并实时补偿,而不是单独针对每个错误来源。我们使用QAM-OFDM调制数据进行了8G样品/S 8通道时间间隔ADC的“深度ADC”技术。不同QAM符号星座和OFDM子载波的仿真结果显示,在动态范围内大约5位的急剧改善,符号误差率伴随着巨大的降低。我们进一步讨论了硬件实施,包括延迟,功耗,内存需求和芯片区域。
With the advent of the 5G wireless networks, achieving tens of gigabits per second throughputs and low, milliseconds, latency has become a reality. This level of performance will fuel numerous real-time applications, such as autonomy and augmented reality, where the computationally heavy tasks can be performed in the cloud. The increase in the bandwidth along with the use of dense constellations places a significant burden on the speed and accuracy of analog-to-digital converters (ADC). A popular approach to create wideband ADCs is utilizing multiple channels each operating at a lower speed in the time-interleaved fashion. However, an interleaved ADC comes with its own set of challenges. The parallel architecture is very sensitive to the inter-channel mismatch, timing jitter, clock skew between different ADC channels as well as the nonlinearity within individual channels. Consequently, complex post-calibration is required using digital signal processing (DSP) after the ADC. The traditional DSP calibration consumes a significant amount of power and its design requires knowledge of the source and type of errors which are becoming increasingly difficult to predict in nanometer CMOS processes. In this paper, instead of individually targeting each source of error, we utilize a deep learning algorithm to learn the complete and complex ADC behavior and to compensate for it in realtime. We demonstrate this "Deep ADC" technique on an 8G Sample/s 8-channel time-interleaved ADC with the QAM-OFDM modulated data. Simulation results for different QAM symbol constellations and OFDM subcarriers show dramatic improvements of approximately 5 bits in the dynamic range with a concomitant drastic reduction in symbol error rate. We further discuss the hardware implementation including latency, power consumption, memory requirements, and chip area.