To investigate the impact of antenna correlation on secrecy performance in MIMO wiretap channels with Nakagami-m fading, the expressions of secrecy outage probability and positive secrecy probability were derived. Div...To investigate the impact of antenna correlation on secrecy performance in MIMO wiretap channels with Nakagami-m fading, the expressions of secrecy outage probability and positive secrecy probability were derived. Diversity order and array gain were also achieved for further insight. The study was based on the information theory that physical layer security can be guaranteed when the quality of the main channel is higher than that of the eavesdropper's channel. Monte Carlo simulations well validated the numerical results of analytic expressions. It was shown that antenna correlation is detrimental to secrecy performance when average SNR of the main channel is at medium and high level. Interestingly, when average SNR of the main channel reduces to low level, the effect of antenna correlation becomes benefi cial to secrecy performance.展开更多
The high tunability of two-dimensional(2D)materials makes them an optimal platform for simulating,achieving,and manipulating novel quantum states in condensed matter physics.Moire flatband systems formed through latti...The high tunability of two-dimensional(2D)materials makes them an optimal platform for simulating,achieving,and manipulating novel quantum states in condensed matter physics.Moire flatband systems formed through lattice mismatch or twisting between atomic layers have recently been discovered,allowing for bridging 2D materials with strongly correlated and topological physics.In this review,we briefly discuss band folding in graphene/hexagonal boron nitride(hBN)moire superlattices and related experimental results as well as introduce a general approach for developing 2D correlated systems and applying them in ABC trilayer graphene on hBN(ABC-TLG/hBN)moire superlattices.We also compare the experimental results of the tunable correlated and topological phenomenon of ABC-TLG/hBN with those of other related moire systems.展开更多
文摘To investigate the impact of antenna correlation on secrecy performance in MIMO wiretap channels with Nakagami-m fading, the expressions of secrecy outage probability and positive secrecy probability were derived. Diversity order and array gain were also achieved for further insight. The study was based on the information theory that physical layer security can be guaranteed when the quality of the main channel is higher than that of the eavesdropper's channel. Monte Carlo simulations well validated the numerical results of analytic expressions. It was shown that antenna correlation is detrimental to secrecy performance when average SNR of the main channel is at medium and high level. Interestingly, when average SNR of the main channel reduces to low level, the effect of antenna correlation becomes benefi cial to secrecy performance.
基金supported by National Key Research Program of China(grant nos.2020YFA0309000,2021YFA1400100)NSF of China(grant no.12174248)SJTU NO.21X010200846。
文摘The high tunability of two-dimensional(2D)materials makes them an optimal platform for simulating,achieving,and manipulating novel quantum states in condensed matter physics.Moire flatband systems formed through lattice mismatch or twisting between atomic layers have recently been discovered,allowing for bridging 2D materials with strongly correlated and topological physics.In this review,we briefly discuss band folding in graphene/hexagonal boron nitride(hBN)moire superlattices and related experimental results as well as introduce a general approach for developing 2D correlated systems and applying them in ABC trilayer graphene on hBN(ABC-TLG/hBN)moire superlattices.We also compare the experimental results of the tunable correlated and topological phenomenon of ABC-TLG/hBN with those of other related moire systems.
