ID 原文 译文
56548 利用链路依赖度(degree of link dependence, DLD)和车辆用户(Vehicle users, VUE)的计算能力提高簇的生存时间,降低基站的开销. In the proposed scheme, the degree of link dependence and the computation ability of vehicle users are utilized to improve the cluster survival time and reduce the BS overhead.
56549 同时,利用动态功率控制和复用区域映射辅助基站分配资源,削弱复用相同蜂窝链路的V-D2D (vehicular device-to-device)链路间和对蜂窝链路的同频干扰,提高频谱效率. Meanwhile, dynamic power control and sharing area mapping are used to assist the BS in allocating resources, reduce the co-frequency interference between vehicular device-to-device (V-D2D) links and between V-D2D links and cellular links that reuse the same frequency, and improve spectrum efficiency.
56550 最后,基于交通仿真建模软件VISSIM产生实时交通流数据,从而验证本文所提资源管理方案,结果表明:基站承担的网络拓扑管理任务量至少降低50%,与传统蜂窝D2D车载通信相比,频谱平均复用次数增加0.5次以上,频谱效率增加10%. Real?time traffic flow data are generated by the traffic simulation modeling software VISSIM to verify the proposed resource management scheme. Simulation results show that the network topology management workload of the BS is reduced by at least 50%. Relative to that in traditional cellular D2D vehicle communication, the average frequency of spectrum sharing in FD-D2D communication increases by more than 0. 5 times, and the spectrum efficiency increases by 10%.
56551 本文研究了一款基于非对称耦合阶跃阻抗谐振器SIR (stepped-impedance resonator)设计的6阶窄带超导平衡式带通滤波器,该滤波器具有高的频率选择性以及宽阻带特性.本文首先研究了3种具有不同耦合特性的SIR耦合对,分析了其差模DM (differential mode)相位移、耦合系数,以及共模CM (common mode)抑制水平.通过适当选取SIR的阻抗比以及使用具有分散谐波分量的不同尺寸的SIR,其高次频得以远离基频,从而拓宽阻带. This study investigates a sixth-order narrowband superconducting balanced filter with high frequency selectivity and wide stopband based on asymmetrically coupled stepped-impedance resonators (SIRs). Three types of coupled SIR pairs with different characteristics are investigated. The differential-mode (DM) phase shifts, coupling coefficients, and common-mode (CM) levels of the three SIR pairs are then analyzed. The spurious frequencies of DM responses can be pushed far away from the fundamental frequency to widen the stopband by properly choosing the impedance ratio of the SIR and using dissimilar SIRs with dispersed harmonics.
56552 同时,由于其DM和CM等效电路具有不同的谐振频率,其带内的共模噪声可以得到天然的抑制. Moreover,an inherent CM suppression can also be obtained because of the different resonant frequencies in DM and CM equivalent circuits.
56553 研究表明,电磁耦合对可在不增加电路面积的情况下获得小的耦合系数以利于窄带设计,电耦合对结构有利于高阶电路的互连,而磁耦合对具有最佳的CM抑制水平. Results also show that the electromagnetic coupling pair can contribute a weak coupling coefficient for narrowband design without increasing the circuit size. The structure of the electric coupling pair is beneficial for high-order circuit interconnection. The magnetic coupling pair possesses the highest CM rejection. Moreover, the weak coupling properties are well-utilized for narrowband design.
56554 此外, 3类SIR对的弱耦合特性均可用于窄带设计.为了验证,本文采用所述3类SIR对设计了一款6阶平衡式带通滤波器,并在此基础上引入交叉耦合结构产生传输零点以提高通带选择性. For validation, a sixth?order balanced bandpass filter is designed using the three coupled SIR pairs, and a cross-coupling structure is further introduced to produce transmission zeros (TZs) and enhance the passband selectivity.
56555 其零点的产生机理通过传输路径的幅度及相位移分析进行了说明.最终,本文利用高温超导HTS (high-temperature superconducting)技术实现了所设计的具有交叉耦合结构的滤波器,以降低插入损耗. The magnitude and phase delay of the DM transmission paths are analytically illustrated to explain the TZ production.
56556 该电路在77 K温度下进行了测量,测试结果表明:通带的相对带宽FBW (fractional bandwidth)为1. 6%,带内插损约为0.37 d B,带内CM抑制度优于40 d B. Eventually, the proposed balanced filter is implemented by a high-temperature superconducting technique to reduce the insertion losses and is measured at the temperature of 77 K. The measured results show that the fractional bandwidth of the passband is 1. 6% with less than 0. 37 dB in-band insertion loss.
56557 其-60 dB带宽/-3 dB带宽的矩形系数小于1.45,同时-20 dB DM阻带达到约5倍f0d(f0d代表DM基波频率). The −60 dB bandwidth/−3 dB bandwidth rectangle ratio is less than 1. 45 while the in-band CM suppression is better than 40 dB. The −20 dB stopband is up to about 5fd0 (fd0 is the DM fundamental frequency).