论文标题
具有不完美CSI的MIMO-OTFS系统的低复杂ZF/MMSE接收器
Low-Complexity ZF/MMSE Receivers for MIMO-OTFS Systems With Imperfect CSI
论文作者
论文摘要
正交时频空间（OTFS）方案将时间和频率选择性通道转换为延迟多普勒域中几乎非选择性通道，为高速移动设备建立了可靠的无线通信。这项工作设计和分析了具有完美且不完美的接收通道状态信息（CSI）的多输入多输出（MIMO）-OTFS系统的低复杂性零强度（LZ）和最小平方误差（LM）接收器。所提出的接收器提供的解决方案与常规对应物的解决方案完全相同，并通过利用MIMO-OTFS通道矩阵的双循环性质，块逆逆和Schur补体来降低复杂性。我们还通过利用泰勒膨胀并取决于随机矩阵理论的产生，该理论是在LZ和LM接收器的封闭形式中的后处理信号到噪声 - 噪声 - 加上差异（SINR）表达式的紧密近似。我们表明，当在多个通道实现上平均衍生的SINR表达式，准确地表征了它们的完美和不完美接收CSI的各自的位错误率（BER）。我们在数值上显示了与最先进的退出解决方案相比，所提出的设计的较低和较低的复杂性。
Orthogonal time-frequency space (OTFS) scheme, which transforms a time and frequency selective channel into an almost non-selective channel in the delay-Doppler domain, establishes reliable wireless communication for high-speed moving devices. This work designs and analyzes low-complexity zero-forcing (LZ) and minimum mean square error (LM) receivers for multiple-input multiple-output (MIMO)-OTFS systems with perfect and imperfect receive channel state information (CSI). The proposed receivers provide exactly the same solution as that of the conventional counterparts, and reduce the complexity by exploiting the doubly-circulant nature of the MIMO-OTFS channel matrix, the block-wise inverse, and Schur complement. We also derive, by exploiting the Taylor expansion and results from random matrix theory, a tight approximation of the post-processing signal-to-noise-plus-interference-ratio (SINR) expressions in closed-form for both LZ and LM receivers. We show that the derived SINR expressions, when averaged over multiple channel realizations, accurately characterize their respective bit error rate (BER) of both perfect and imperfect receive CSI. We numerically show the lower BER and lower complexity of the proposed designs over state-of-the-art exiting solutions.
