论文标题

基于SVM的通道估计和一位大型MIMO系统的数据检测

SVM-based Channel Estimation and Data Detection for One-Bit Massive MIMO Systems

论文作者

Nguyen, Ly V., Swindlehurst, A. Lee, Nguyen, Duy H. N.

论文摘要

低分辨率类似于数字转换器(ADC)的使用是降低大规模多输入 - 元素输出(MIMO)系统的成本和功耗的实用解决方案。但是,低分辨率ADC的严重非线性在接收的信号中引起严重的扭曲,并使渠道估计和数据检测任务更具挑战性。在本文中,我们可以利用\ textIt {support {support vector Machine}(\ textit {svm}),一种众所周知的机器学习中的监督学习技术,可以利用以一位ADC的形式提供高效且可靠的频道估计和数据检测。首先,不相关的通道的通道估计问题被提出为常规的SVM问题。然后对该SVM问题的目标函数进行修改,以估计空间相关的通道。接下来,提出了两阶段检测算法,其中在第一阶段进一步利用SVM。当通道完全知道时,提出的数据检测方法的性能非常接近最大似然(ML)数据检测。我们还提出了一种基于SVM的联合通道估计和数据检测(CE-DD)方法,该方法同时使用了已驱动的数据向量和Pilot数据向量来提高估计和检测性能。最后,提出了将拟议方法扩展到具有频率选择性褪色通道的OFDM系统。仿真结果表明,所提出的方法是有效且稳健的,并且表现优于现有方法。

The use of low-resolution Analog-to-Digital Converters (ADCs) is a practical solution for reducing cost and power consumption for massive Multiple-Input-Multiple-Output (MIMO) systems. However, the severe nonlinearity of low-resolution ADCs causes significant distortions in the received signals and makes the channel estimation and data detection tasks much more challenging. In this paper, we show how \textit{Support Vector Machine} (\textit{SVM}), a well-known supervised-learning technique in machine learning, can be exploited to provide efficient and robust channel estimation and data detection in massive MIMO systems with one-bit ADCs. First, the problem of channel estimation for uncorrelated channels is formulated as a conventional SVM problem. The objective function of this SVM problem is then modified for estimating spatially correlated channels. Next, a two-stage detection algorithm is proposed where SVM is further exploited in the first stage. The performance of the proposed data detection method is very close to that of Maximum-Likelihood (ML) data detection when the channel is perfectly known. We also propose an SVM-based joint Channel Estimation and Data Detection (CE-DD) method, which makes use of both the to-be-decoded data vectors and the pilot data vectors to improve the estimation and detection performance. Finally, an extension of the proposed methods to OFDM systems with frequency-selective fading channels is presented. Simulation results show that the proposed methods are efficient and robust, and also outperform existing ones.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源