Telecommunications Engineering

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New why the bidirectional SMF is not working when RSOA is used in the circuit? if optical circulator is necessary for the RSOA based experiment??
bidirectional SMF is not working while simulating the RSOA based WDM circuit. but it worked properly while using BLS at ONU. without using optical c... [more]

bidirectional SMF is not working while simulating the RSOA based WDM circuit. but it worked properly while using BLS at ONU. without using optical circulator i got good result for the RSOA based wdm network but every paper has the design with optical circulator. RSOA is used f not only for the remodulation but also making the circuit cost effective. so why the optical circulator??

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By Anindya Das · Haldia Institute of Technology

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2 I want to calculate the variance of the noise in a nonlinear channel. how do I do?
By Salah Bouhoun · École nationale polytechnique d'Alger

Yuriy Shmaliy · Universidad de Guanajuato

That is true for the variance in a linear channel. Why did you mention that the channel is nonlinear?

That is true for the variance in a linear channel. Why did you mention that the channel is nonlinear?

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Question:
New What is Baseline Wandering?
What is effects in Polar/Non polar NRZ,RZ and Manchester schemes

What is effects in Polar/Non polar NRZ,RZ and Manchester schemes

By Kamlesh Gupta · M.I.E.T GONDIA

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1 Is Error Vector Magnitude (EVM) a true performance metric for optical telecommunication systems?
By Mahmood Hameed · University of Kansas

Andre Richter · VPIphotonics

Hi Mahmood, EVM just gives you the average difference of received points compared to the ideal point of a constellation diagram (E.g., provides infor... [more]

Hi Mahmood, EVM just gives you the average difference of received points compared to the ideal point of a constellation diagram (E.g., provides information about first order spreading). If your distribution of points can be described closely by a Gaussian distribution, EVM could be calculated from mean and std quite accurately, and would have a close relation to the actual BER. If, however, you have a case where only a few points are far away from the ideal point, while all the others are close to it (as you described in your case), EVM does not relate well to BER. Similar discrepancies could occur for other statistical distributions such as truncated Gaussian, or bean-shaped due to NL-phase noise. So I think, BER is the only true performance measure - EVM could serve as estimate for certain cases, but would fail for others.

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5 Fiber optic telecommunication
By Shabnam Mohammadi · Faculty of Information Technology - ITS Surabaya

Joshua White · Clarkson University

How new are we talking, and at what level. Are you intersted in the latest in last mile deployment technologies, or more physical components like the ... [more]

How new are we talking, and at what level. Are you intersted in the latest in last mile deployment technologies, or more physical components like the fiber and lasers being used?

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8 How are SDH STM-1 multiplexors synchronized?
By Zainab Abubakar · Birmingham City University

Joshua White · Clarkson University

To build on what Yaakov Stein said, the Stratum levels are a standard for NTP (Network Time Protocol - See RFC 1305). A Stratum 0 clock uses GPS for s... [more]

To build on what Yaakov Stein said, the Stratum levels are a standard for NTP (Network Time Protocol - See RFC 1305). A Stratum 0 clock uses GPS for synchronism among network elements. Stratum1 servers / network devices get there information from a stratum 0 system and pass it on over the network, and so on for the various levels. Typical SONET networks use a stratum 0 device at their core and source there clocks from it. STM-1 multiplexers rely on the Stratum 1 that results.

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3 What is the most suitable EM suite for planar antenna array design?
By A. De Oliveira · University of São Paulo

Varun Iyengar · M S Ramaiah School of Advanced Studies

CST all the way!! ADS is best for EMI/EMC and RF Design not for antenna (it has just a MOM solver) CST (FIT, MOM and some hybrid solvers)

CST all the way!! ADS is best for EMI/EMC and RF Design not for antenna (it has just a MOM solver) CST (FIT, MOM and some hybrid solvers)

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1 Telecommunication roaming charges.
By Avinash Kumar · Rayat Institute of Engineering and Information Technology

Mahmood Hameed · University of Kansas

When a user moves from one cell to the other, it increases the available capacity of old cell by one and requests for reducing the capacity of new cel... [more]

When a user moves from one cell to the other, it increases the available capacity of old cell by one and requests for reducing the capacity of new cell by one. In telecommunications, capacity equals money. Even though the user leaves the old cell, there is no guarantee (provided by the user) that it will be used up immediately.

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1 Mathematical modeling of errors on satellite channel
By Salah Bouhoun · École nationale polytechnique d'Alger

Francisco Lazaro Blasco · German Aerospace Center (DLR)

Good references are: E. Lutz, M. Werner, A. Jahn, "Satellite systems for personal and broadband communications", Springer-Verlag, Berlin, 2000. G. Mar... [more]

Good references are: E. Lutz, M. Werner, A. Jahn, "Satellite systems for personal and broadband communications", Springer-Verlag, Berlin, 2000. G. Maral and M. Bousquet, "Satellite Communications Systems: Systems, Techniques and Technology, 5th Edition", Wiley Both are books which are not freely available. In case you do not have access to these books you can check the documentation of the propagation program at JPL, NASA which is available online: http://descanso.jpl.nasa.gov/Propagation/propagation.cfm

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2 How we can minimize the jitter in mobile communication?
By Hari Bahadur Karki · Tribhuvan University

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2 Multiple access techniques under research
By Bashar Mufid · Al-Quds University

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6 Are there anyone using (Matlab-Simulink) TRUETIME simulator ?
By Kubra Karayagiz · Sabanci University

Kubra Karayagiz · Sabanci University

I also added ttNoSchedule to the code.But,then I realised that the main problem was that I didn't write network numbers into ttSendMsg and ttGetMsg fu... [more]

I also added ttNoSchedule to the code.But,then I realised that the main problem was that I didn't write network numbers into ttSendMsg and ttGetMsg functions.So,it automatically sends via network 1 only.I corrected these parts and now,it works. Thank you very much.

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7 Does anyone know about the design of helical antenna?
By si Thu · Northumbria University

si Thu · Northumbria University

Thanks for your suggestion but It is still happeb problem. I think that i need to put the microstip line between helix and coaxial connector. However ... [more]

Thanks for your suggestion but It is still happeb problem. I think that i need to put the microstip line between helix and coaxial connector. However I don't know how to design the microstrip line in cst. Is there any idea for design of microstrip line for helical antenna? Thanks

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12 How does external EMI affect signals in coaxial cables?
By Fernando Marengo Rodriguez · Rosario National University

George Slade · Institute of Electrical and Electronics Engineers

If you don't want to use baluns, you can use wideband differential op amps (e.g. the Analog Devices AD8138 or similar) to do single-ended to different... [more]

If you don't want to use baluns, you can use wideband differential op amps (e.g. the Analog Devices AD8138 or similar) to do single-ended to differential conversion and back again. The advantage of this is that you avoid the use of magnetic components (transformers), can add gain right at the microphone (helps S/N ratio) and can make the source and load impedances anything you want by designing the appropriate resistive network.

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2 What is the output of a Gabor filter?
By yu Zhao · Nanjing University of Posts and Telecommunications

yu Zhao · Nanjing University of Posts and Telecommunications

The return value of a Gabor filters bank is complex, e.g. 1 + 1*i, so what does the magnitude and phase of the complex stand for respectively?

The return value of a Gabor filters bank is complex, e.g. 1 + 1*i, so what does the magnitude and phase of the complex stand for respectively?

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6 Which algorithm's could be presenting to solve problem with the minimum distance/traffic costs of PSTN network optimization?
By Kafrawi Tuara · Universitas Ahmad Dahla

Kafrawi Tuara · Universitas Ahmad Dahla

Thanks you for your reference, Sir.

Thanks you for your reference, Sir.

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12 Can anybody share their knowledge about LTE-A (Long Term Evolution-Advanced)?
By Surya Sunny · Vedavyasa Institute of Technology

Surya Sunny · Vedavyasa Institute of Technology

Thanks Thavamaran, Dr Imayavaramban Munuswamy · ,Abubakar Miyim ·

Thanks Thavamaran, Dr Imayavaramban Munuswamy · ,Abubakar Miyim ·

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About Telecommunications Engineering

Telecommunications engineering, or telecom engineering, is a major field within electronic engineering. The work ranges from basic circuit design to strategic mass developments.

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