This paper proposes a novel scheme for mitigating strong interferences, which is applicable to various wireless scenarios, including full-duplex wireless communications and uncoordinated heterogeneous networks. As strong interferences can saturate the receiver’s analog-to-digital converters (ADC), they need to be mitigated both before and after the ADCs, i.e., via hybrid processing. The key idea of the proposed scheme, namely the Hybrid Interference Mitigation using Analog Prewhitening (HIMAP), is to insert an $M$ -input $M$ -output analog phase shifter network (PSN) between the receive antennas and the ADCs to spatially prewhiten the interferences, which requires no signal information but only an estimate of the covariance matrix. After interference mitigation by the PSN prewhitener, the preamble can be synchronized, the signal channel response can be estimated, and thus a minimum mean squared error (MMSE) beamformer can be applied in the digital domain to further mitigate the residual interferences. The simulation results verify that the HIMAP scheme can suppress interferences 80dB stronger than the signal by using off-the-shelf phase shifters (PS) of 6-bit resolution.

中文翻译：

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使用模拟预白化的混合干扰缓解

本文提出了一种减轻强干扰的新方案，适用于各种无线场景，包括全双工无线通信和非协调异构网络。由于强干扰会使接收器的模数转换器 (ADC) 饱和，因此需要在 ADC 之前和之后减轻它们，即通过混合处理。所提出方案的关键思想，即使用模拟预白化 (HIMAP) 的混合干扰减轻，是插入一个 百万美元 -输入 百万美元 - 在接收天线和 ADC 之间输出模拟移相器网络 (PSN) 以在空间上预白化干扰，这不需要信号信息，只需要协方差矩阵的估计。通过PSN预白化器抑制干扰后，可以同步前导码，可以估计信道响应，因此可以在数字域中应用最小均方误差（MMSE）波束形成器以进一步减轻残留干扰。仿真结果验证了 HIMAP 方案可以通过使用现成的 6 位分辨率的移相器 (PS) 来抑制比信号强 80dB 的干扰。