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The Interference Channel Revisited: Aligning Interference by Adjusting Antenna Separation
IEEE Transactions on Signal Processing ( IF 5.4 ) Pub Date : 2021-03-03 , DOI: 10.1109/tsp.2021.3063442 Amir Leshem 1 , Uri Erez 2
IEEE Transactions on Signal Processing ( IF 5.4 ) Pub Date : 2021-03-03 , DOI: 10.1109/tsp.2021.3063442 Amir Leshem 1 , Uri Erez 2
Affiliation
It is shown that, in a line-of-sight setting, a receiver equipped with two antennas may approximately null an arbitrary large number of spatial directions to any desired degree, while maintaining the interference-free signal-to-noise ratio, by judiciously adjusting the distance between the antenna elements, provided that the spacing can be made sufficiently large. The main theoretical result builds on ergodic theory. The practicality of the scheme at moderate signal-to-noise values is demonstrated for a scenario where each transmitter is equipped with a single antenna and each receiver has two receive chains and where the desired spacing between antenna elements is achieved by selecting the appropriate antennas from a large enough linear antenna array. We further extend the proposed scheme to show that interference can be nearly eliminated also in specular multipath channels as well as multiple-input multiple-output interference channels where a single additional receive antenna suffices to approximately align all interferers into a one-dimensional subspace. To demonstrate the performance of the scheme, we show significant gains for interference channels with four as well as six users, at low to moderate signal-to-noise ratios (
$0\text{--}20$ dB). The robustness of the proposed technique to small channel estimation errors is also explored.
中文翻译:
再谈干扰通道:通过调整天线间距调整干扰
结果表明,在视距设置中,配备有两个天线的接收机可以通过明智地保持无干扰信噪比的同时,将任意数量的空间方向近似置零为任何所需程度。如果可以使间距足够大,则调节天线元件之间的距离。主要的理论结果建立在遍历理论的基础之上。在每个发射器都配备单个天线并且每个接收器都具有两个接收链并且通过从中选择合适的天线来实现所需天线元件之间的间距的情况下,证明了该方案在适度信噪比值下的实用性。足够大的线性天线阵列。我们进一步扩展了提出的方案,以表明在镜面多径信道以及多输入多输出干扰信道中,也可以几乎消除干扰,其中单个额外的接收天线足以将所有干扰源大致对准一维子空间。为了证明该方案的性能,我们在低至中等信噪比的情况下,显示了具有四个和六个用户的干扰信道的显着增益($ 0 \ text {-} 20 $ D b)。还探讨了所提出的技术对小信道估计误差的鲁棒性。
更新日期:2021-04-09
中文翻译:
再谈干扰通道:通过调整天线间距调整干扰
结果表明,在视距设置中,配备有两个天线的接收机可以通过明智地保持无干扰信噪比的同时,将任意数量的空间方向近似置零为任何所需程度。如果可以使间距足够大,则调节天线元件之间的距离。主要的理论结果建立在遍历理论的基础之上。在每个发射器都配备单个天线并且每个接收器都具有两个接收链并且通过从中选择合适的天线来实现所需天线元件之间的间距的情况下,证明了该方案在适度信噪比值下的实用性。足够大的线性天线阵列。我们进一步扩展了提出的方案,以表明在镜面多径信道以及多输入多输出干扰信道中,也可以几乎消除干扰,其中单个额外的接收天线足以将所有干扰源大致对准一维子空间。为了证明该方案的性能,我们在低至中等信噪比的情况下,显示了具有四个和六个用户的干扰信道的显着增益(