scholarly journals A Categorized Resource Sharing Mechanism for Device-to-Device Communications in Cellular Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Jie Chen ◽  
Chang Liu ◽  
Husheng Li ◽  
Xulong Li ◽  
Shaoqian Li
Keyword(s):  
Resource Sharing ◽  
Communication Systems ◽  
Wireless Communication Systems ◽  
D2d Communications ◽  
Transmit Power ◽  
Minimization Principle ◽  
The Third ◽  
Key Technologies ◽  
Device To Device ◽  
Maximum Transmit Power

Device-to-Device (D2D) communications are considered one of the key technologies for 5G wireless communication systems. In this paper, a resource sharing mechanism, which applies different policies for different cases (thus being categorized), is proposed. In this scheme, all D2D pairs are divided into three groups by comparing the minimum transmit power with the maximum transmit power of each cellular UE. The proposed mechanism enables multiple D2D pairs in the second group to share the resource with cellular user equipment (UE) simultaneously, by adjusting the transmit powers of these D2D transmitters. At the same time, D2D pairs in the first group and the third group share resource with cellular UE based on the transmit power minimization principle. Simulation results show that the proposed scheme can achieve relatively higher network throughput and lower transmit power consumption of the D2D system.

scholarly journals Honeycomb Structure and Key Technologies of 5G Wireless Communication Network

2018 ◽  
Vol 232 ◽  
pp. 01013
Author(s):  
Siyan Duan
Keyword(s):  
Communication Network ◽  
Wireless Communication ◽  
Communication Systems ◽  
Honeycomb Structure ◽  
Wireless Communication Systems ◽  
Wireless Technology ◽  
Technology Application ◽  
Wireless Communication Network ◽  
Key Technologies ◽  
Technology Level

In recent years, wireless technology in China has been further improved. Wireless system designers have also begun research on 5G wireless communication systems and obtained good research results. The application of the 5G cellular structure can effectively solve the problems existing in the current wireless technology application, thereby promoting the further improvement of the wireless technology level. This paper mainly discusses the cellular technology and the key technologies of 5G wireless communication network.

scholarly journals A novel compact stair-shaped multiband fractal antenna for wireless communication systems

2021 ◽  
Vol 72 (5) ◽  
pp. 306-314
Author(s):  
Zain ul Abidin Jaffri ◽  
Zeeshan Ahmad ◽  
Asif Kabir ◽  
S. Sabahat ◽  
H. Bukhari
Keyword(s):  
Fractal Geometry ◽  
Communication Systems ◽  
Data Communication ◽  
Wireless Communication Systems ◽  
Fractal Antenna ◽  
Multiple Frequency ◽  
Radiation Characteristics ◽  
The Third ◽  
Self Similar ◽  
Good Agreement

Abstract The growing demand for enhanced capacities, broadband services, and high transmission speeds to accommodate speech, image, multimedia, and data communication simultaneously puts a requirement for antenna to operate in multiple frequency bands. A novel compact fractal antenna based on self-similar stair-shaped fractal geometry is proposed in this paper. The fractal antenna is designed by modifying the patch antenna through the iterative process using stair-shaped fractal geometry. The third iteration results in a tri-band response, and the antenna resonate at 3.65, 4.825, and 6.325 GHz with impedance bandwidths of 75.6, 121.2, and 211.4 MHz, respectively. The antenna is designed in CST Microwave studio, and evaluated for operating bands and radiation characteristics. Prototype for the third iteration of the fractal antenna is fabricated on FR-4 substrate which is further tested for measured operating bands and radiation characteristics. The simulated and measured results show good agreement.

scholarly journals Effect of increasing the network capacity using device-to-device technology for next generation networks

2020 ◽  
Vol 17 (1) ◽  
pp. 303
Author(s):  
Aws Zuheer Yonis
Keyword(s):  
Communication Systems ◽  
Network Capacity ◽  
Base Station ◽  
D2d Communication ◽  
Next Generation Networks ◽  
Wireless Communication Systems ◽  
Next Generation ◽  
Direct Communication ◽  
Fifth Generation ◽  
Device To Device

Device-to-device (D2D) communication is one of the key technologies in the fifth generation of wireless communication systems, which is defined as direct communication between two mobile users without traversing the base station D2D communication plays an increasingly important role and which improves communication capability and reduces communication delay and power consumption. D2D communication that enables direct communication between nearby mobiles is an exciting and innovative feature of next-generation cellular networks. In order to meet the rising subscriber demands and provide them satisfactory services, D2D communication is being looked upon as an emerging technology of the next generation networks.

Functional RF Devices Powered by MEMS Technologies

2012 ◽  
Vol 81 ◽  
pp. 75-83 ◽  
Author(s):  
Ken Ya Hashimoto ◽  
Hideki Hirano ◽  
Shuji Tanaka ◽  
Masayoshi Esashi
Keyword(s):  
Acoustic Wave ◽  
Software Defined Radio ◽  
Communication Systems ◽  
Research Trends ◽  
Bulk Acoustic Wave ◽  
Wireless Communication Systems ◽  
Front End ◽  
Rf Front End ◽  
Key Technologies ◽  
Rf Devices

This paper discusses use of MEMS technologies in radio frequency (RF) frontend. First, configuration of RF front-end in current wireless communication systems is surveyed, and research trends of the flexible RF front-end and software defined radio (SDR) are discussed. Second, various RF tunable filters are introduced, and we discuss how high performances are expected by the use of tunable RF surface and bulk acoustic wave (SAW/BAW) filters provided that above mentioned key technologies are developed. Finally, our attempts for realization of tunable RF SAW/BAW filters are introduced.

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