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In this paper, the problem of physical layer security in the uplink of millimeter‐wave massive multiple‐input multiple‐output (MIMO) networks is studied and a jamming detection and suppression method is proposed. The proposed method is based on directional information of the received signals at the base station antenna array. The proposed jamming detection method can accurately detect both the existence and direction of the jammer using the received pilot signals in the training phase. The obtained information is then exploited to develop a channel estimator that excludes the jammer's angular subspace from received training signals. The estimated channel information is then used for designing a combiner at the base station that is able to effectively cancel out the deliberate interference of the jammer. By numerical simulations, the performance of the proposed jamming detection method is evaluated in terms of correct detection probability and false alarm probability, and its effectiveness when the jammer's power is substantially lower than the user's power is shown. Also, the results show that the proposed jamming suppression method can achieve a very close spectral efficiency as the case of no jamming in the network.

Direction‐based jamming detection and suppression in mmWave massive MIMO networks