3 papers
cs.IT2023
Optimal Power Assignment for MIMO Channels Under Joint Total and Per-Group Power Constraints
Mahdi Khojastehnia, Ioannis Lambadaris, Ramy H Gohary +1
In this paper we consider a communication system with one transmitter and one receiver. The transmit antennas are partitioned into disjoint groups, and each group must satisfy an a…
cs.IT2020
Comments on "Precoding and Artificial Noise Design for Cognitive MIMOME Wiretap Channels"
Mahdi Khojastehnia, Sergey Loyka
Several gaps and errors in [1] are identified and corrected. While accommodating these corrections, a rigours proof is given that the successive convex approximation algorithm in […
cs.IT2019
Comments on "On Favorable Propagation in Massive MIMO Systems and Different Antenna Configurations" [1]
S. Loyka, M. Khojastehnia
It is shown that the condition of Theorem 1 in [1] never holds in practice and that Theorem 2 is incorrect under the stated condition. Extra assumptions or/and modifications are ne…