Physical layer

This study was conducted. Moreover, it is shown that choosing the best Tx/Rx parameters is necessary to meet service quality requirements such as BER and transmission confidentiality. The provided findings provide insightful information about the practical considerations of deploying UWOC/ CDMA systems.

11p viengfa 28-10-2024 3 1   Download

In this study, we propose a NOMA communication model combined with linear array antennas for the purpose of enhancing physical layer security. We introduce a model of 4 nodes: transmitter node S, receiver node D1, receiver node D2, eavesdropping node E.

10p viling 11-10-2024 0 0   Download

The primary objectives of this study were to: Investigate the fouling potential, and characterise the organic components of the membrane foulant layers, of clarified activated sludge and lagoon effluent obtained from the WTP; Investigate the fouling propensities of EOM and AOM derived from a blue-green algal culture as it passed through the growth cycle, ie., for which the cells had not been subject to physical disruption; Determine any difference in the fouling propensity of EOM and AOM and relate it to organic composition.

99p runthenight07 01-03-2023 3 3   Download

The objectives of the present study are: To design and produce functional samples of woven single-layer, fire-resistant fabrics made from natural, FR man-made cellulosics, and high-performance synthetic blended yarns; to determine the physiological consequences and health risks associated with wearing PPC in hot, humid environments in relation to metabolic heat production and physical work for firefighters trying to maintain the balance between protection and comfort, and its implication on the required Station Wear fabric properties.

184p runordie3 06-07-2022 9 3   Download

Bài viết đề xuất mô hình chuyển tiếp hai chặng, sử dụng kỹ thuật chọn lựa nhiều nút chuyển tiếp đơn phần (Partial Relay Selection) để nâng cao hiệu năng bảo mật ở lớp vật lý (Physical Layer Security) cho mạng thứ cấp (secondary network) trong môi trường vô tuyến nhận thức dạng nền (Underlay Cogntive Radio). Các biểu thức dạng tường minh chính xác của xác suất dừng bảo mật trên kênh truyền fading Rayleigh đã được đưa ra. Mời các bạn cùng tham khảo!

6p wangziyi_1307 26-04-2022 19 4   Download

The investigation of magnetic field strength variations over subterranean layers may reveal their locations on Earth’s surface and provide physical and geometrical characteristics. Magnetic studies were carried out around Gölcük caldera lake using proton magnetometers to identify subsurface volcanic structures. The acquired data were inverted using four different edge detection algorithms such as analytic signal, tilt angle, theta map, horizontal gradient. Afterwards, the results were used to determine the locations of the anomalous structures.

17p tanmocphong 29-01-2022 14 1   Download

This study analyses eccentrically stiffened sandwich thick plates with the core layer made of negative poisson material. The analytical method based on the first order shear deformation theory (FSDT) is applied to analyse dynamic response and vibration of the plates.

10p meyerowitz 25-12-2021 10 1   Download

Bài viết nghiên cứu phương pháp bảo mật lớp vật lý (Physical-Layer Security) cho mạng vô tuyến nhận thức dạng nền (Underlay Cognitive Radio Network) sử dụng mã Fountain. Trong mô hình nghiên cứu, nguồn thứ cấp và nút chuyển tiếp thứ cấp hiệu chỉnh công suất phát để đảm bảo chất lượng dịch vụ của mạng sơ cấp không bị ảnh hưởng.

9p viaespa2711 31-07-2021 38 2   Download

In this study, the authors will show that a semimetal-insulator phase transition may take place in the GaSb/InAs heterostructures due to the exciton pairing between the electrons and holes in the system. In the heterostructure, the top of the valence band of the InAs layer is higher than the bottom of the conduction band of the GaSb layer.

8p tamynhan9 02-12-2020 11 2   Download

In this research, the structural and electronic properties of N-doped anatase TiO2 layers were evaluated using the density functional theory (DFT). The results show that doping positions of N atoms cause different effects on the size and shape of unit cells of models.

7p tamynhan8 04-11-2020 17 3   Download

This paper investigates how PbS coating layers influence the characteristics of GaAs single junction solar cells through I-V characteristic measurements, optical reflectance spectra, and quantum efficiencies.

6p tamynhan6 14-09-2020 14 2   Download

Composite materials have gained traction in the world today and are becoming of common use in industrial and specialized applications in general due to their flexible nature that involves mixing through layers or matrixes the components of various substances and therefore, a percentage of each substance’s physical properties.

12p lucastanguyen 01-06-2020 41 2   Download

An investigation was carried out at Norman E. Borlaug Crop Research Centre of G. B. Pant Univ. Agric. & Tech. Pantnagar, U. S. Nagar, Uttarakhand, India in order to study the influence of long-term applications of fertilizers and manures on different soil physical properties after forty two cycles in silty clay loam textured Typic Haplustept under ricewheat cropping sequence during 2012-13. The field was laid out in a randomized block design comprising of ten treatments.

9p nguaconbaynhay5 16-05-2020 19 1   Download

This Master of Science degree thesis aims at investigating, studying and developing the new physical layer for the new handled generation of terrestrial TV standard DVB-NGH. This new physical layer is based on the DVB-T2 physical layer specification, but it introduces several advanced mechanisms to allow the transmission of high definition TV services in mobile environments. The main objective of this thesis work is focused on illustrating the benefits of the new physical layer when compared to T2 physical layer.

42p son248 24-03-2020 24 1   Download

This Master of Science degree thesis aims at investigating, studying and developing the new physical layer for the new handled generation of terrestrial TV standard DVB-NGH. This new physical layer is based on the DVB-T2 physical layer specification, but it introduces several advanced mechanisms to allow the transmission of high definition TV services in mobile environments. The main objective of this thesis work is focused on illustrating the benefits of the new physical layer when compared to T2 physical layer.

42p son248 24-03-2020 27 1   Download

Bài viết đề xuất một hệ thống kết hợp kỹ thuật điều chế không gian (Spatial Modulation – SM) và mã hóa mạng lớp vật lý (Physical-layer Network Coding – PNC) nhằm nâng cao hiệu suất sử dụng phổ tần số và thông lượng của hệ thống thông tin vô tuyến chuyển tiếp.

10p viengland2711 23-07-2019 60 3   Download

After completing this chapter, students will be able to: Explain the role of Physical layer protocols and services in supporting communication across data networks, describe the role of signals used to represent bits as a frame as the frame is transported across the local media, describe the purpose of Physical layer signaling and encoding as they are used in networks.

87p youcanletgo_01 04-01-2016 70 6   Download

In chapter 4, students will be able to: Explain how physical layer protocols and services support communications across data networks, build a simple network using the appropriate, explain the role of the data link layer in supporting communications across data networks, compare media access control techniques and logical topologies used in networks.

66p youcanletgo_01 29-12-2015 69 4   Download

Bài giảng Học phần Mạng máy tính – Computer networks: Chương 3 - Lớp vật lý Physical Layer cung cấp cho các bạn những nội dung về khái niệm; tần số, phương tiện truyền dẫn hữu tuyến; môi trường truyền dẫn vô tuyến; một số mạng truyền thông phổ biến hiện nay.

42p cocacola_07 09-11-2015 138 8   Download

2D nanomaterials such as graphene and transition metal dichal  cogenides (TMDCS) have shown outstanding potential in many fields such as fl exible electronics, sensing and optics due to their desirable physical and structural properties. High quality black phosphorus atomic layers by liquid phase exfoliation include Experimental Section; Supporting Information and Acknowledgements.

6p dangthaitrieu 11-05-2015 34 3   Download