Title :
Ergodic Secrecy Sum-Rate for Downlink Multiuser MIMO Systems With Limited CSI Feedback
Author :
Na Li ; Xiaofeng Tao ; Jin Xu
Author_Institution :
Nat. Eng. Lab. for Mobile Network Security, Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
This paper investigates the ergodic secrecy sum-rate for the downlink multiuser MIMO system with independent confidential messages, each of which is intended for one of the users and should keep secret from others. We adopt zero-forcing beamforming with limited channel state information (CSI) feedback at the transmitter, and derive the closed-form expression for the ergodic secrecy sum-rate. Moreover, we analyze some of its asymptotic characteristics, which provide guidance on secure transmission design. Finally, all theoretical results are validated by numerical simulations.
Keywords :
MIMO communication; array signal processing; message authentication; radio transmitters; telecommunication security; wireless channels; asymptotic characteristics; channel state information; downlink multiuser MIMO system; ergodic secrecy sum rate; independent confidential messages; limited CSI feedback; numerical simulation; secure transmission design; transmitter; zero forcing beamforming; Downlink; Feedback; MIMO; Ergodic secrecy sum-rate; limited CSI feedback; multiuser MIMO; physical layer security;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.2319821
