ID 原文 译文
45836 分析发射端天线数对 MISO 系统可达自由度的影响，导出逼近系统自由度外界的条件。 The impact of the number of transmit antennas on achievable DoF in the MISO system was analyzed, revealing that DoF results approach to the outer bound as the number of transmit antennas increases.
45837 进一步研究 MIMO 系统接收端天线数对系统自由度的影响，给出保持系统可达自由度的 CSI 反馈时延范围。 Further, the impact of the number of receive antennas on achievable DoF was characterized, deriving the range of CSI feedback delay that preserves achievable DoF in the MIMO system.
45838 理论和数值分析表明，所提 DSTIA 方案能充分消除用户间干扰，获得更高的自由度增益，缩小可达界与外界的差距，提高系统的可达速率。 Theoretical and numerical analyses show that,the proposed DSTIA scheme can achieve better sum-DoFs by eliminating inter-user interference perfectly, tighten the gap between achievable DoF and outer bound, as well as improve the achievable rate of the system.
45839 由于终端资源受限，蜂窝上行链路传输的安全性难以保证。 The mutual interference between cellular links and D2D links can bring the secrecy gain to cellular users inD2D-enable cellular networks.
45840 考虑到 D2D（device-to-device）蜂窝系统中同频干扰能够带来安全增益，提出一种机会 D2D 接入的安全传输方案。 To make full use of them, a cooperative secrecy transmission scheme was proposed based on wireless channels.
45841 该方案分别利用无线信道的方向性和增益刻画复用资源的 D2D 用户对蜂窝用户和其他 D2D 用户的干扰大小，为保证两者通信的可靠性， The channel direction information and gains depict the interference from D2D links to cellular link sand other D2D links in the proposed scheme.
45842 首先，选择满足干扰受限条件的 D2D 用户接入网络进行通信， Firstly, only the D2D users which meet the limited interference conditions were accessed to cellular networks to ensure their reliable communications.
45843 而接入网络的 D2D 用户可看作蜂窝用户的友好干扰者为其带来安全增益。 It was assumed that legitimate users and eavesdroppers were independent two-dimensional homogeneous Poisson point processes (PPP) distribution.
45844 其次，采用泊松点过程（PPP, Poisson point process）对系统中的各节点进行建模，分别利用安全中断概率（SOP, secrecy outage probability）和连通中断概率（COP, connection outage probability）表征蜂窝用户通信的安全性和 D2D 用户通信的可靠性，并分析了干扰门限对两者通信性能的影响。 Then the security outage probability (SOP) was derived for cellular users and the connection outage probability (COP) for D2D users,and the impacts of interference thresholds were discussed on their performances.
45845 然后，在保证蜂窝用户 SOP 性能需求的前提下，提出一种在满足蜂窝用户安全性的条件下，最小化 D2D 用户 COP 的优化模型，并利用联合搜索方法得到最佳干扰门限值。 Next, an optimization model was given to minimize D2D users’ COP while ensuring the secrecy performance requirements of cellular users, thus achieving the optimal performance.