PDF
Full
Outline
To overcome the influence of beam split in terahertz communication, for the problems of a large number of large-range delay devices, high hardware complexity and high power consumption in traditional fully connected antenna structure schemes based on single-layer and double-layer delay devices, a multi-user hybrid analog/digital precoding scheme based on multi-layer delayers was considered. In this scheme, the time delays were divided into multi-layer arrangement at the base station, and hybrid precoding design was carried out based on the multi-layer delayers. Specifically, firstly the bit number of time delays and the set of discrete time delay based on the number of time delays in each layer and antennas were deduced. Secondly according to the array response vector at the center frequency, the phase shift of phase shifter was designed. Then the propagation delay of antenna array aperture corresponding to the subarray where the delayer is located was used as the delay of time delays, and the delayer delay was discretized based on the discrete delay set. Afterwards, analog precoding was designed based on the phase shift of phase shifter and the delay of time delays. Finally, low complexity zero forcing precoding technology was used to design digital precoding. Simulation and analysis results show that compared to traditional scheme, the proposed scheme can greatly reduce the number of large range delay devices and hardware complexity while sacrificing a small amount of rate performance.
PDF
72
31
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
