Browsing by Subject "Mimo systems"

Now showing items 1-10 of 10

    • Article  

      An Algorithm for Global Maximization of Secrecy Rates in Gaussian MIMO Wiretap Channels 

      Loyka, S.; Charalambous, Charalambos D. (2015)
      Optimal signaling for secrecy rate maximization in Gaussian MIMO wiretap channels is considered. While this channel has attracted a significant attention recently and a number of results have been obtained, including the ...
    • Conference Object  

      Capacity for MIMO systems at low SNR 

      Ioannou, I.; Charalambous, Charalambos D.; Denic, S. (2010)
      The paper introduces an asymptotic series expansion for the mutual information of Multiple-Input Multiple-Output (MIMO) channels. For low signal to noise ratio (SNR) the first term of expansion approaches mutual information ...
    • Conference Object  

      Information capacity of MIMO channels with relative entropy constraint 

      Charalambous, Charalambos D.; Denic, S. Z.; Constantinou, C. (2006)
      This paper addresses the issue of multiple-input multiple-output (MIMO) wireless channel capacity, when the probability distribution of the channel matrix p(H) is not completely known to the transmitter and the receiver. ...
    • Article  

      Mutual information expansion for MIMO systems and capacity formulae at low SNR 

      Ioannou, I.; Charalambous, Charalambos D.; Denic, S. (2011)
      The paper introduces a new asymptotic series expansion for the mutual information of multiple-input multiple-output (MIMO) channels. The expansion approaches mutual information from below, and for low signal to noise ratio ...
    • Article  

      Novel Matrix Singular Value Inequalities and Their Applications to Uncertain MIMO Channels 

      Loyka, S.; Charalambous, Charalambos D. (2015)
      Novel matrix singular value inequalities are established for a sum/product of three matrices. Their application to the uncertain (compound) multiple-input multiple-output (MIMO) channel subject to normed additive uncertainty ...
    • Article  

      On the compound capacity of a class of MIMO channels subject to normed uncertainty 

      Loyka, S.; Charalambous, Charalambos D. (2012)
      The compound capacity of uncertain multiple-input multiple-output channels is considered, when the channel is modeled by a class described by a (known) nominal channel and a constrained-norm (unknown) uncertainty. Within ...
    • Article  

      Optimal signaling for secure communications over Gaussian MIMO wiretap channels 

      Loyka, S.; Charalambous, Charalambos D. (2016)
      Optimal signaling over the Gaussian multiple-input multiple-output wire-tap channel is studied under the total transmit power constraint. A closed-form solution for an optimal transmit covariance matrix is obtained when ...
    • Conference Object  

      Outage capacity and probability for a class of MIMO channels 

      Ioannou, I.; Charalambous, Charalambos D. (2010)
      This paper is concerned with outage capacity and probability of Multiple-Input Multiple-Output (MIMO) systems for a class of channel distributions. The results illustrate how outage probability and capacity degrade as a ...
    • Article  

      Outage probability under channel distribution uncertainty 

      Ioannou, I.; Charalambous, Charalambos D.; Loyka, S. (2012)
      Outage probability and capacity of a class of block-fading MIMO channels are considered under partial channel distribution information. Specifically, the channel or its distribution is not known but the latter is known to ...
    • Article  

      Rank-Deficient Solutions for Optimal Signaling over Wiretap MIMO Channels 

      Loyka, S.; Charalambous, Charalambos D. (2016)
      Capacity-achieving signaling strategies for the Gaussian wiretap multiple-input multple-output (MIMO) channel are investigated without the degradedness assumption. In addition to known solutions, a number of new rank-deficient ...