On Sum Secure Degrees of Freedom for K-User MISO Broadcast Channel With Alternating CSIT

by   Leyla Sadighi, et al.

In this paper, the sum secure degrees of freedom (SDoF) of the K-user Multiple Input/Single Output (MISO) Broadcast Channel with Confidential Messages (BCCM) and alternating Channel State Information at the Transmitter (CSIT) is investigated. In the MISO BCCM, a K-antenna transmitter (TX) communicates toward K single-antenna receivers (RXs), so that message for RX k is kept secret from RX j with j<k. For this model, we consider the scenario in which the CSI of the RXs from 2 to K is instantaneously known at the transmitter while CSI of RX 1 is known at the transmitter (i) instantaneously for half of the time and (ii) with a unit delay for the remainder of the time. We refer to this CSIT availability as alternating CSIT. Alternating CIST has been shown to provide synergistic gains in terms of SDoF and is thus of a viable strategy to ensure secure communication by simply relying on the CSI feedback strategy. Our main contribution is the characterization of sum SDoF for this model as SDoF_ sum= (2K-1)/2. Interestingly, this SDoF_ sum is attained by a rather simple achievability in which the TX uses artificial noise to prevent the decoding of the message of the unintended receivers at RX 1. For simplicity first, the proof for the case K=3 is discussed in detail and after that, we have presented the results for any number of RXs.


page 1

page 2

page 3

page 4


On the Secure Degrees of Freedom of the K-user Interference Channel with Delayed CSIT

In this paper, the K-user interference channel with confidential message...

Securing Multi-User Broadcast Wiretap Channels with Finite CSI Feedback

In this work, we investigate the problem of secure broadcasting over blo...

Optimality of Simple Layered Superposition Coding in the 3 User MISO BC with Finite Precision CSIT

We study the K=3 user multiple input single output (MISO) broadcast chan...

Precoding and Scheduling for AoI Minimization in MIMO Broadcast Channels

In this paper, we consider a status updating system where updates are ge...

On the Separability of Parallel MISO Broadcast Channels Under Partial CSIT: A Degrees of Freedom Region Perspective

We study the K-user, M-subchannel parallel multiple-input-single-output ...

Increasing Security Degree of Freedom in Multi-user and Multi-eve Systems

Secure communication in the Multi-user and Multi-eavesdropper (MUME) sce...

Please sign up or login with your details

Forgot password? Click here to reset