In recent years, physical layer security has been regarded as a promising concept to provide secure communications in next generation mobile systems, where theoretically massive MIMO can significantly enhance the system secrecy performance due to its advantage in shaping the transmitted signals to null the interference or leakage. However, in practical systems, the channel state information is often imperfect due to the outdated channel effect and the channel estimation error. In this paper, we investigate the physical layer security problem in a multi-user massive MIMO system under imperfect CSI. We first derive a tight asymptotic lower bound of the ergodic system secrecy capacity under imperfect CSI, and then analyze how imperfect CSI affects the system secrecy performance. Simulation results reveal the negative impact of the imperfect CSI on the secrecy performance of massive MIMO systems and the accuracy of our theoretical derivations and analysis.
|Original language||English (US)|
|Title of host publication||2018 IEEE International Conference on Communications, ICC 2018 - Proceedings|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|State||Published - Jul 27 2018|
|Event||2018 IEEE International Conference on Communications, ICC 2018 - Kansas City, United States|
Duration: May 20 2018 → May 24 2018
|Name||IEEE International Conference on Communications|
|Other||2018 IEEE International Conference on Communications, ICC 2018|
|Period||5/20/18 → 5/24/18|
Bibliographical noteFunding Information:
ACKNOWLEDGMENT This work was supported in part by the National Science Foundation of China under grant numbers 61622101 and 61571020; the Ministry National Key Research and Development Project under grant 2016YFE0123100; and the National Science Foundation under grant number CNS-1343189.
© 2018 IEEE.
- Imperfect CSI
- Massive MIMO
- Physical layer security
- Secrecy capacity