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Low-Complexity Symbol Detection and Interference Cancellation for OTFS System
IEEE Transactions on Communications ( IF 8.3 ) Pub Date : 2020-12-07 , DOI: 10.1109/tcomm.2020.3043007
Huiyang Qu , Guanghui Liu , Lei Zhang , Shan Wen , Muhammad Ali Imran

Orthogonal time frequency space (OTFS) is a two-dimensional modulation scheme realized in the delay-Doppler domain, which targets the robust wireless transmissions in high-mobility environments. In such scenarios, OTFS signal suffers from multipath channel with continuous Doppler spread, which results in significant inter-symbol interference and inter-Doppler interference (IDI). In this article, we analyze the interference generation mechanism, and compare statistical distributions of the IDI in two typical cases, i.e., limited-Doppler-shift channel and continuous-Doppler-spread channel (CoDSC). Focusing on the OTFS signal transmission over the CoDSC, our study firstly indicates that the widespread IDI incurs a computational burden for the element-wise detector like the message passing in the state-of-the-art works. Addressing this challenge, we propose a block-wise OTFS receiver by exploiting the structure and characteristics of the OTFS transmission matrix. In the receiver, we deliberately design an iteration strategy among the least squares minimum residual based channel equalizer, reliability-based symbol detector and interference eliminator, which can realize fast convergence by leveraging the sparsity of channel matrix. The simulations demonstrate that, in the CoDSC, the proposed scheme achieves much less detection error, and meanwhile reduces the computational complexity by an order of magnitude, compared with the state-of-the-art OTFS receivers.

中文翻译:

OTFS系统的低复杂度符号检测和干扰消除

正交时频空间(OTFS)是在延迟多普勒域中实现的二维调制方案,其目标是在高移动性环境中实现可靠的无线传输。在这种情况下,OTFS信号会受到具有连续多普勒扩展的多径信道的影响,这会导致符号间干扰和多普勒干扰(IDI)。在本文中,我们分析了干扰产生的机制,并比较了两种典型情况下IDI的统计分布,即受限多普勒频移信道和连续多普勒扩展信道(CoDSC)。着眼于CoDSC上的OTFS信号传输,我们的研究首先表明,广泛的IDI像在最新技术中传递的消息一样,给逐元素检测器带来了计算负担。应对这一挑战,通过利用OTFS传输矩阵的结构和特性,我们提出了一种块状OTFS接收器。在接收机中,我们精心设计了一种基于最小二乘最小残差的信道均衡器,基于可靠性的符号检测器和干扰消除器之间的迭代策略,可以利用信道矩阵的稀疏性实现快速收敛。仿真表明,与最新的OTFS接收器相比,在CoDSC中,所提出的方案实现的检测误差小得多,同时将计算复杂度降低了一个数量级。我们精心设计了一种基于最小二乘最小残差的信道均衡器,基于可靠性的符号检测器和干扰消除器之间的迭代策略,可以利用信道矩阵的稀疏性实现快速收敛。仿真表明,与最新的OTFS接收器相比,在CoDSC中,所提出的方案实现的检测误差小得多,同时将计算复杂度降低了一个数量级。我们精心设计了一种基于最小二乘最小残差的信道均衡器,基于可靠性的符号检测器和干扰消除器之间的迭代策略,可以利用信道矩阵的稀疏性实现快速收敛。仿真表明,与最新的OTFS接收器相比,在CoDSC中,所提出的方案实现了更少的检测误差,同时将计算复杂度降低了一个数量级。
更新日期:2020-12-07
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