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arXiv 2006.03758eess.SPcs.SYeess.SY
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一种适用于MIMO信道的无干扰滤波器组多载波系统

An Interference-Free Filter-Bank Multicarrier System Applicable for MIMO Channels

Mohammad Towliat

摘要:

在滤波器组多载波(FBMC)系统中,固有干扰是在多输入多输出(MIMO)信道上实现分集增益的主要挑战。在本文中,我们开发了一种新的多载波系统称为FBMC偏移上下多相网络(FBMC/OULP),其中,为了消除固有的干扰,复值符号交替地通过上半部分和下半部分的多相网络分支与偏移时间传输。FBMC/OULP系统的符号密度等于时频网格中的一个复值符号。此外,对于在频率选择性信道上的传输,在FBMC/OULP系统的接收机处采用最小均方误差(MMSE)估计器以消除由信道的频率选择性引起的干扰。所提出的方案减轻了在上多相分支和下多相分支中的符号之间产生的干扰,基于循环卷积属性。正交空时分组码(OSTBC)在MIMO信道中使用复值符号并减小干扰,通过低复值的最大似然(ML)检测器可以获得全分集增益。仿真结果表明,与正交频分复用(OFDM)系统相比,该系统在快多径衰落信道下具有更好的性能,在慢多径衰落信道下具有竞争力的性能。

英文摘要:

In filter-bank multicarrier (FBMC) systems the intrinsic interference is the major challenge to achieve a full gain of diversity over multi-input multi-output (MIMO) channels. In this paper, we develop a novel multicarrier system called FBMC offset upper-lower polyphase network (FBMC/OULP) in which, to eliminate the intrinsic interference, the complex-valued symbols are alternatively transmitted via upper and lower half of polyphase network branches with an offset time. The symbol density of the FBMC/OULP system is equal to one complex-valued symbol in time-frequency lattice. Also, for transmission over frequency selective channels, a minimum mean square error (MMSE) estimator is employed at the receiver of the FBMC/OULP system to eliminate the interference caused by the frequency selectivity of the channel. The proposed scheme mitigates the produced interference between symbols in the upper and lower polyphase branches, based on the circular convolutional property. As a result of using complex-valued symbols and diminishing the interference, the full diversity gain of the orthogonal space-time block codes (OSTBC) can be achieved in MIMO channels by a low complex maximum likelihood (ML) detector. In comparison with the orthogonal frequency division multiplexing (OFDM) system, simulation results indicate that the proposed system achieves a superior performance in fast multi-path fading channels and a competitive performance in slow multi-path fading channels.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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