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Channel parameter acquisition in MIMO LOS systems for high capacity microwave links

机译：MIMO LOS系统中用于大容量微波链路的信道参数获取

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摘要

Due to the increased traffic load, next generation wireless communication standards require to increase the capacity of current point-to-point (PtP) wireless backhaul links in the microwave frequency bands. Multiple-input, multiple-output (MIMO) systems are essential to multiply the link capacity, and such solutions have been already presented in the recent literature as a promising technology to increase the data rate, for line-of-sight (LOS) wireless PtP connections. In this paper, we focus on the initial acquisition scheme of a MIMO 2x2 architecture for microwave M-ary quadrature amplitude modulation (M-QAM) transceivers, based on two completely independent radio frequency (RF) chains which use different local oscillators (LOs). During the acquisition phase, a 4-QAM training preamble is considered with a joint algorithm for estimating both the MIMO gains for the interference cancellation and the timing error for initializing the clock recovery loop. A phase recovery closed loop scheme is jointly used during the acquisition phase, and the same algorithm may be used for phase error correction when the receiver switches to the tracking mode. Simulations prove the effectiveness of the proposed solutions, by considering both qualitative and quantitative results. (C) 2019 Elsevier B.V. All rights reserved.
机译：由于增加的业务负荷，下一代无线通信标准要求增加微波频带中当前点对点（PtP）无线回程链路的容量。多输入多输出（MIMO）系统对于增加链路容量必不可少，这种解决方案已在最近的文献中提出，作为一种有前景的技术，可以提高视线（LOS）无线传输的数据速率。 PtP连接。在本文中，我们基于两个完全独立的射频（RF）链（使用不同的本地振荡器（LO）），针对微波M元正交幅度调制（M-QAM）收发器的MIMO 2x2体系结构的初始捕获方案。在采集阶段，考虑使用4-QAM训练前同步码和联合算法，用于估计用于干扰消除的MIMO增益和用于初始化时钟恢复环路的定时误差。在捕获阶段，将相位恢复闭环方案联合使用，并且当接收机切换到跟踪模式时，可以将相同的算法用于相位误差校正。通过考虑定性和定量结果，仿真证明了所提出解决方案的有效性。 （C）2019 Elsevier B.V.保留所有权利。

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