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We design a jamming-resistant receiver scheme to enhance the robustness of a massive MIMO uplink system against jamming. We assume that a jammer attacks the system both in the pilot and data transmission phases. The key feature of the proposed scheme is that, in the pilot phase, the base station estimates not only the legitimate channel, but also the jamming channel by exploiting a purposely unused...
In this paper, we address the multiuser detection problem in the presence of strong interference, mixture of Gaussian and α-stable noises. We initially obtain locally optimal (LO) detection rule for this problem which can almost completely suppress interference effect and combat α-stable noise to some extent using oversampling in the receiver or channel coding in the transmitter. Then, we derive a...
In this paper, the problem of cooperative beamforming is investigated in a heterogeneous underlay cognitive network. A major difference exists between a conventional cooperative beamforming problem and cooperative beamforming in a CR (Cognitive Radio)network due to the interference constraints imposed by primary network. These constraints can greatly increase the complexity of the related optimization...
In this paper, we introduce a new transmission scheme for downlink of multiple antenna code division multiple access (CDMA) systems. In the proposed scheme, the Alamouti's space-time block coding (STBC) method is extended to multiuser systems. Moreover, to mitigate multiple access interference in the conventional receivers, the linear transmit preceding technique is used in the transmitter. We show...
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