3GPP Release 16 will freeze the 2.1GHz FDD NR enhanced 40M large bandwidth standard in July 2020. At present, a small number of terminals have experimental capability. In the 3.5GHz TDD NR network with 100M bandwidth,...
详细信息
ISBN:
(纸本)9781665435949
3GPP Release 16 will freeze the 2.1GHz FDD NR enhanced 40M large bandwidth standard in July 2020. At present, a small number of terminals have experimental capability. In the 3.5GHz TDD NR network with 100M bandwidth, how to use 2.1GHz FDD NR has become a hot issue in the industry. This paper compares the coverage and capacity of 2.1GHz FDD NR and 3.5GHz TDD NR through link budget and theoretical calculation;compares the uplink and downlink coverage of the two systems through single station pull-out experiment;selects the existing network with 2.1GHz FDD NR and 3.5GHz TDD NR deployed at the same site as the experimental site, and analyzes the uplink and downlink networking capacity of the two systems through Driving Test (DT). Considering the influence of the number of transmitting antennas of existing terminals and the transmitting power of network equipment on the network planning, the network capacity of this experiment includes 2.1GHz 4T4R and 3.5G 64TR, the terminal capacity includes 2.1GHz 1T4R, 2.1GHz 2T4R and 3.5GHz 2T4R, and the power consumption of network equipment involves 2.1GHz: 4x4OW and 4x6OW;3.5GHz: 160W and 200W. At present, there is no literature about the existing network experiment of multi-power consumption and multiterminal type, so this paper has important reference significance for operators to deploy 2.1GHz+3.5GHz network.
Terahertz (THz) band has been envisioned as a promising enabler that achieves high-speed information transmission and provides adequate spectrum resources for future sixth generation (6G) wireless systems. However, du...
详细信息
Terahertz (THz) band has been envisioned as a promising enabler that achieves high-speed information transmission and provides adequate spectrum resources for future sixth generation (6G) wireless systems. However, due to the extremely high frequency and the strong directionality of THz waves, the wireless communication links in such a frequency range (from 0.1 THz to 10 THz) suffer from serious path loss, multi-path fading, communication interruption and poor coverage. To this end, the intelligent reflecting surface (IRS) is proposed to improve the coverage performance for the indoor THz communication scenarios. Interestingly, the IRS is able to smartly reconfigure the propagation of electromagnetic waves by adjusting the discrete phase shifts of the IRS elements. Although the exhaustive phase shift search scheme can significantly enhance the coverage capability of THz communication, it involves the unacceptable computation complexity. Subsequently, a low complexity phase shift search scheme, called suboptimal search scheme, is proposed by just selecting the partially better combinations of discrete phase shifts. Simulation results show that the proposed suboptimal search scheme is able to achieves the near-optimal coverage performance and greatly decreases the computational burden compared with the exhaustive search method. Moreover, the ray-tracing technique is leveraged to validate effectiveness of the IRS in practical application scenarios. (C) 2020 Elsevier B.V. All rights reserved.
This paper,from the characteristics of the mobile satellite ground track,discusses a method of the design of mobile satellite constellations with common ground track.,and also uses the method on the China area design ...
详细信息
ISBN:
(纸本)0780363949
This paper,from the characteristics of the mobile satellite ground track,discusses a method of the design of mobile satellite constellations with common ground track.,and also uses the method on the China area design by way of computer simulation and specialized satellite communication *** choosing the satellite orbit period as one fourth of the sidereal day,the eccentricity as 0.158,the orbital plane inclination as 63.4 degrees,only 8 Common- Ground-Track (CGT) satellites can cover China almost seamlessly,while the average elevation angle is greater than 50 degrees.
暂无评论