1. Combining Dirty-Paper Coding and Artificial Noise for Secrecy
Bo Wang1, Pengcheng Mu1, Chao Wang1, Weile Zhang1, Hui-Ming Wang1, and Bobin Yao2
1School of Electron. & Inform. Eng.,
Xi’an Jiaotong University,
Xi’an, China,
2School of Electron. & Control Eng.,
Chang’an University,
Xi’an, China,

2. Outline Introduction System model Problem formulation
Transmission scheme
Optimization algorithm
Simulation results
Conclusions
2018/7/23
IEEE ICASSP 2016

3. Introduction Physical layer security Shannon’49
Wiretap channel Wyner’75 CsiszarKorner-TIT’78
Secrecy capacity
Secrecy rate & wiretap code
Alice
Eve
Bob X Y Z
2018/7/23
IEEE ICASSP 2016

4. Introduction Multi-antenna techniques
Beamforming KhistiWornell-TIT’10
Artificial noise (AN) GoelNegi-TWC’08
LiMa-TSP’13
Intrinsic secrecy in multiuser networks
2018/7/23
IEEE ICASSP 2016

5. System model M-user wiretap broadcast channel
An N-antenna transmitter Alice
M single-antenna legitimate receivers Bob-m
A single-antenna passive eavesdropper Eve
large-scale fading
2018/7/23
IEEE ICASSP 2016

6. System model Broadcasting Secrecy capacity & dirty-paper coding (DPC)
EkremUlukus-TIT’11 & BagherikaramMotahariKhandani-TIT’13
2018/7/23
IEEE ICASSP 2016

7. System model ? Secrecy outage Secrecy outage probability (SOP)
2018/7/23
IEEE ICASSP 2016

8. normal communication rate of Bob-m
Problem formulation
Secrecy rate maximization
secrecy rate of Bob-1
normal communication rate of Bob-m
SOP of Bob-1
power budget
2018/7/23
IEEE ICASSP 2016

9. Transmission scheme Zero-forcing dirty-paper coding (ZF-DPC) 2018/7/23
IEEE ICASSP 2016

10. Transmission scheme Hybrid secure transmission scheme 2018/7/23
IEEE ICASSP 2016

11. Transmission scheme Simplified optimization problem 2018/7/23
IEEE ICASSP 2016

12. Optimization algorithm
Simplified SOP
Introduce
2018/7/23
IEEE ICASSP 2016

13. Optimization algorithm
Decomposition (fix )
2018/7/23
IEEE ICASSP 2016

14. Optimization algorithm
Solution to the inner problem
optimal power allocation among
2018/7/23
IEEE ICASSP 2016

15. Optimization algorithm
Solution to the outer problem
convex
quasi-concave
The global optimum can be found !
2018/7/23
IEEE ICASSP 2016

16. Simulation results Comparison with the traditional AN scheme 2018/7/23
IEEE ICASSP 2016

17. Conclusions
DPC enables a simple and accurate characterization of the intrinsic secrecy in a multiuser broadcast channel.
The proposed hybrid secure transmission scheme supports the secure transmission for one user and the normal transmission for some other users simultaneously. The achievable secrecy rate can be close to that of the traditional AN scheme.
2018/7/23
IEEE ICASSP 2016

18. THANK YOU Bo Wang School of Electronic and Information Engineering,
Xi’an Jiaotong University