2 research outputs found
The DoF Region of Order-(K-1) Messages for the K-user MIMO Broadcast Channel with Delayed CSIT
This paper theoretically characterizes the degrees-of-freedom (DoF) region of
order- messages for the -user multiple-input multiple-output (MIMO)
broadcast channel with delayed channel state information at the transmitter
(CSIT) and arbitrary antenna configurations, where the transmitter has
antennas and the receiver has antennas. For the
converse, we first derive the DoF region of order- messages for the
-user MIMO broadcast channel with no CSIT and arbitrary antenna
configurations with the aid of the proposed Genie-bound, and then establish the
DoF outer region. For the achievability, we first design a 2-phase transmission
scheme, and then propose a backward/forward cancellation algorithm for
decoding. Specifically, we efficiently derive the achievable DoF region from
the designed transmission scheme by transformation approach. The main
implication of this paper is that for the order- messages of -user
MIMO broadcast channel, the DoF region with delayed CSIT is larger than the DoF
region with no CSIT when , where .Comment: Accpeted by IEEE/CIC International Conference on Communications in
China, 202
Secure Degrees-of-Freedom of the MIMO X Channel with Delayed CSIT
In this paper, we study the secure degrees-of-freedom (SDoF) characterization
for the multiple-input multiple-output (MIMO) X channel with confidential
messages and delayed CSIT. In particular, we propose a transmission scheme,
which can be regarded as a generalization of the state-of-the-art scheme
without security and with delayed CSIT. The key of this generalization is
performing the security analysis, by which we derive the optimal duration of
the artificial noise transmission phase. As a result, we drive the sum-SDoF
lower bound. Furthermore, we reveal that if the number of receive antennas,
denoted by N, is fixed, the number of transmit antennas for the maximal
sum-SDoF lower bound achieved by our scheme saturates at (7+\sqrt{33})N/8.Comment: Submitted to IEE