scholarly journals Advances in local area optical data communication systems

2020 ◽  
Vol 83 (7) ◽  
pp. 075101
Author(s):  
D G Cunningham ◽  
I H White
Keyword(s):  
Communication Systems ◽  
Data Communication ◽  
Local Area ◽  
Optical Data

ELECTRONICS FOR HIGH SPEED, BURST MODE OPTICAL COMMUNICATIONS

1990 ◽  
Vol 01 (03n04) ◽  
pp. 223-243 ◽  
Author(s):  
R.G. SWARTZ ◽  
Y. OTA
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Data Communication ◽  
Optical Fiber Communication ◽  
Digital Data ◽  
Optical Data ◽  
Data Link ◽  
Fiber Communication ◽  
Burst Mode ◽  
Multiple Channel

Electronics for burst mode data communication over an optical data link will contribute to wider acceptance of photonic technology. This paper describes the concepts and difficulties inherent in burst mode optical communication systems, and proposes a new solution employing an ultra-high speed, high accuracy peak detector. Sensitivity penalties associated with this technique are reviewed. The method was implemented in an optical receiver with dc to 500 Mb/s operation, and at 200 Mb/s, demonstrates an isolated pulse sensitivity of −29.5 dBm, and pulse width distortion less than lns. An example application, the Multiple channel Optical Data LINK (MODLINK), is described: a fully dc-coupled, 12 parallel channel digital data link system designed for high speed optical fiber communication at bit rates ranging from dc to 200 Mb/s per channel, applicable at distances of centimeters to over 3 km.

Simulation in Amateur Packet Radio Networks

2012 ◽  
pp. 216-256 ◽  
Author(s):  
Miroslav Škoric
Keyword(s):  
Communication Systems ◽  
Local Area Network ◽  
Data Communication ◽  
Real Data ◽  
Local Area ◽  
Radio Networks ◽  
Area Network ◽  
Packet Radio Networks ◽  
Packet Radio ◽  
Amateur Radio

Computer programs that radio amateurs use in their packet radio networks give various opportunities in simulating real data communication systems. Such systems include radio-relay networks of digital repeaters that operate in cities or in rural and remote locations, email servers that handle amateur radio messaging and file exchange, and a variety of end-user stations at home or work. This chapter summarizes the results of recent experiments in network simulations by using amateur radio software in a local area network. We tested the main features of those amateur radio programs and their repercussions to the functionality of simulated networks and to the comfort and satisfaction in average network participants. Described tests help practitioners, students, and teachers in computer science and communication technologies, in implementing amateur radio within the existing computer networks and in planning and using telecommunication systems without making any investment in hardware infrastructure.

scholarly journals Study of 5G-NR-MIMO Links in the Presence of an Interferer

Electronics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 732
Author(s):  
Avner Elgam ◽  
Yael Balal ◽  
Yosef Pinhasi
Keyword(s):  
Mobile Networks ◽  
Communication Systems ◽  
Multiple Input Multiple Output ◽  
Local Area ◽  
Maximum Energy ◽  
Base Station ◽  
Small Cells ◽  
Diversity Coding ◽  
Shift Keying ◽  
Input Multiple Output

Many communication systems are based on the Multiple Input, Multiple Output (MIMO) scheme, and Orthogonal Space–time Block Transmit diversity Coding (OSTBC), combined with Maximal Ratio Receive Combining (MRRC), to create an optimal diversity system. A system with optimal diversity fixes and optimizes the channel’s effects under multi-path and Rayleigh fading with maximum energy efficiency; however, the challenge does not end with dealing with the channel destruction of the multi-path impacts. Susceptibility to interference is a significant vulnerability in future wireless mobile networks. The 5th Generation New Radio (5G-NR) technologies bring hundreds of small cells and pieces of User Equipment (UE) per indoor or outdoor local area scenario under a specific Long Term Evolution (LTE)-based station (e-NodeB), or under 5G-NR base-station (g-NodeB). It is necessary to study issues that deal with many interference signals, and smart jammers from advanced communication equipment cause deterioration in the links between the UE, the small cells, and the NodeB. In this paper, we study and present the significant impact and performances of 2×2 Alamouti Phase-Shift Keying (PSK) modulation techniques in the presence of an interferer and a smart jammer. The destructive effects affecting the MIMO array and the advanced diversity technique without closed-loop MIMO are analyzed. The performance is evaluated in terms of Bit Error Rate (BER) vs. Signal to Interference Ratio (SIR). In addition, we proved the impairment of the orthogonal spectrum assumption mathematically.

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