Confidential broadcasting via coordinated beamforming in two-cell networks

We design a linear precoder based on the principles of the generalized regularized channel inversion (RCI) precoder that achieves confidential broadcasting in a two-cell network. In each cell of the network, an N-antenna base station (BS) communicates with K single-antenna users. We consider coordin...

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Bibliographic Details
Published in:2015 IEEE International Conference on Communications (ICC) pp. 7376 - 7382
Main Authors: Biao He, Nan Yang, Xiangyun Zhou, Jinhong Yuan
Format: Conference Proceeding
Language:English
Published: IEEE 01.06.2015
Subjects:
Approximation methods
Array signal processing
Broadcasting
Interference
Security
Signal to noise ratio
Transmitting antennas
ISSN:1550-3607
Online Access:Get full text
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Summary:We design a linear precoder based on the principles of the generalized regularized channel inversion (RCI) precoder that achieves confidential broadcasting in a two-cell network. In each cell of the network, an N-antenna base station (BS) communicates with K single-antenna users. We consider coordinated beamforming where the BSs in the two cells do not share messages but the users in the two cells feed back their channel state information to both BSs. In the precoder design, we determine the optimal regularization parameter that maximizes the secrecy sum rate. To this end, we derive new channel-independent expressions for the secrecy sum rate in the large-system regime, where K and N approach infinity with a fixed ratio μ = K/N. Moreover, we propose a power-reduction strategy that significantly improves the secrecy sum rate at high transmit signal-to-noise ratios when μ is higher than 0.5.
ISSN:1550-3607
DOI:10.1109/ICC.2015.7249505