scholarly journals Study of Full-Duplex Communication with Excellent Security by 3-Level Communication Method

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1186
Author(s):  
Seong-Mi Park ◽  
Sung-Jun Park ◽  
Sang-Kil Lim
Keyword(s):  
Communication System ◽  
Full Duplex ◽  
Communication Security ◽  
Communication Line ◽  
Network Construction ◽  
Communication Signal ◽  
Half Duplex ◽  
Current Transmission ◽  
Communication Method ◽  
Time Division

Currently, the industry is using the MODBUS communication method, utilizing RS485 for the distributed equipment and network construction. This method has a rather good transmission and reception distance but has a disadvantage in that it is a half-duplex communication method that cannot simultaneously transmit and receive. Therefore, there is a great need for a full-duplex communication system that can simultaneously transmit and receive two-wire communications. Therefore, in this paper, we propose new communication hardware equipment that can implement a full-duplex communication method by communication signal level in order to overcome the disadvantage of communication speed when using a full-duplex communication method by time division method. The proposed communication hardware is a structure that can transmit and receive at the same time in such a way that two pieces of equipment communicating by two-wire communication can apply the outgoing signal to the same communication line and detect the received signal at the same time. Therefore, the receiving side can analyze the received signal based on the information on the current transmission signal. This signal can only be analyzed by the two communicating devices, indicating that communication security is very good.

scholarly journals A Study on the Improvement of Parallel Operation Characteristics of DC/DC Converter Using Improved Full-Duplex Communication Hardware

2019 ◽  
Vol 9 (24) ◽  
pp. 5346
Author(s):  
Sang-Kil Lim ◽  
Seong-Mi Park ◽  
Hyun-Rok Cha ◽  
Sung-Jun Park
Keyword(s):  
Power Quality ◽  
Data Transmission ◽  
Communication System ◽  
Electrical Signal ◽  
Full Duplex ◽  
Parallel Operation ◽  
Communication Signal ◽  
Half Duplex ◽  
Communication Method ◽  
Operation Characteristics

Recently, as dependence and demand for electricity are rapidly increasing in all areas, including industry, methods for increasing capacity and reliability through parallel operations have been studied. In general, Modbus communication method with RS485 is used as a method of parallel operation for capacity increase. However, this method has a disadvantage in that it is a half-duplex communication system that cannot transmit and receive at the same time. However, the Modbus communication method is a half-duplex communication system where physical transmission and reception cannot be performed simultaneously. Therefore, as the number of power converters performing parallel operation increases, the communication period increases, which affects the power quality due to the decrease in control speed. Therefore, in this paper, we propose a hardware that can achieve a full-duplex communication method by a communication signal level to improve power quality. The characteristic of the proposed communication hardware is that the transmitter generates two-level signals for data transmission, but the receiver generates three-level electrical signals according to the state of the transmission data generated by the receiver. The generated three-level electrical signal is characterized in that the data transmission signal information of the transmitter and the data transmission signal information of the receiver occur at the same time. As a result, the communication speed is reduced by more than twice, which improves the power quality by improving the control characteristics when performing parallel operation.

scholarly journals A Review of the Use Cases and Possible Technologies for 5G and Beyond Communications

2021 ◽  
pp. 94-111
Author(s):  
Ali Mahamoud Ali ◽  
Bakhit Amine Adoum ◽  
Idriss Saleh Bachar ◽  
Nasrullah Armi ◽  
Mahamat Saleh Idriss ◽  
...  
Keyword(s):  
Communication System ◽  
Multiple Input Multiple Output ◽  
Use Cases ◽  
Full Duplex ◽  
Small Cells ◽  
Future Research ◽  
Half Duplex ◽  
Multiple Input ◽  
Key Technologies ◽  
Input Multiple Output

5G communication system is rapidly taking shape and for many organizations, including administrations, it is important to be aware of developments in this regard. At this stage, it is essential to know about 5G use cases and possible key technologies. This paper describes several anticipated 5G use cases across a handful of different sectors. It is important to remember that these comprise only a subset of possible use cases and these are all still new. As-yet more new use cases are expected to emerge and the need to prepare their adaption in 5G and beyond. From wireless transmission, wireless access and network perspectives, the possible key technologies of 5G, including Massive Multiple Input Multiple Output (MIMO), Beam-forming, Device-to-Device communication system (D2D), non-orthogonal multiple access (NOMA), Full duplex, Small cells, cognitive radio(CR), etc. and their latest progress are presented comprehensively and thoroughly. Each has enormous advantages but also limitations. The Full duplex which will help to double the capacity of the channel compared to the Half-duplex technology of 4G and Small cells combined with millimeter waves to have a wide bandwidth. These Small-Cells are essential for energy reduction and also for improving latency. But these Small-Cells require the use of intelligent antennas, that is to say, the diagrams of which are directive and reconfigurable at the request of the user Future research challenges regarding 5G and beyond wireless communication are also discussed.

scholarly journals Hybrid One-Way Full-Duplex/Two-Way Half-Duplex Relaying Scheme

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 7737-7745 ◽  
Author(s):  
Yurong Wang ◽  
Kui Xu ◽  
Aijun Liu ◽  
Xiaochen Xia
Keyword(s):  
Full Duplex ◽  
Half Duplex

Design and Implementation of a Multi-Channel HDLC Protocol Controller Based on FPGA

2011 ◽  
Vol 383-390 ◽  
pp. 6840-6845 ◽  
Author(s):  
Yong Hong Gu ◽  
Wei Huang ◽  
Qiao Li Yang
Keyword(s):  
Error Control ◽  
Data Transfer ◽  
Full Duplex ◽  
Programmable Logic ◽  
Data Link ◽  
Total Cost ◽  
Half Duplex ◽  
Level Data ◽  
Layer 2 ◽  
High Level

To transmit and receive data over any network successfully, a protocol is required to manage the flow. High-level Data Link Control (HDLC) protocol is defined in Layer 2 of OSI model and is one of the most commonly used Layer 2 protocol. HDLC supports both full-duplex and half-duplex data transfer. In addition, it offers error control and flow control. Currently on the market there are many dedicated HDLC chips, but these chips are neither of control complexity nor of limited number of channels. This paper presents a new method for implementing a multi-channel HDLC protocol controller using Altera FPGA and VHDL as the target technology. Implementing a multi-channel HDLC protocol controller in FPGA offers the flexibility, upgradability and customization benefits of programmable logic and also reduces the total cost of every project which involves HDLC protocol controllers.

Full‐duplex and half‐duplex: power efficiency comparison

2016 ◽  
Vol 52 (6) ◽  
pp. 483-485 ◽  
Author(s):  
Dingzhu Wen ◽  
Guanding Yu
Keyword(s):  
Power Efficiency ◽  
Full Duplex ◽  
Half Duplex ◽  
Efficiency Comparison
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