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In this paper, we investigate the optimal cooperative range for communications secrecy in an ultra dense network where the source nodes and eavesdroppers (Eves) are randomly distributed. Assuming that all the source nodes inside of the cooperative range (a distance range centered at the target user) participate in cooperative transmission, analytical approximations of the secrecy outage probability...
In this paper, we investigate the secure communication in the massive MIMO uplink, where a legitimate single antenna transmitter (Alice) communicates with a legitimate receiver implemented with massive antenna array, in the presence of multiple eavesdroppers (Eves). Considering co-located or distributed antenna (CA or DA) placement of the eavesdropping nodes, we first respectively derive analytical...
In this paper, we investigate the achievable downlink rate of line-of-sight (LOS) multiple-input multiple-output (MIMO) systems, where uniform circular arrays (UCAs) is deployed at Base station (BS). Based on an existing three-dimensional channel model developed by considering both the azimuth and elevation dimensions. We first analyze channel vectors by assuming that users are randomly distributed...
In this paper, we study adaptive transmission mode switching between statistical and instantaneous channel state information (CSI) aided single-user (SU) and multiuser (MU) precoding for a two-user downlink system, where two transmit antennas are equipped at the base station and each mobile user has one receive antenna. In the case where only statistical CSI (SCSI) is available at the transmitter,...
This paper proposes limited feedback spatial division multiple access (SDMA) schemes for transmit correlated channels by using statistical channel state information (SCSI) and instantaneous channel state information (ICSI). Different from conventional codebook-based MU-MIMO scheme, the proposed multi-beam selection with single channel quality indicator (CQI) feedback (MBS-SCF) scheme determines the...
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