Questions related to Telecommunications Engineering
Hello good time
What metals can be used in the design of high frequency devices such as Coaxial transmission lines , waveguides, coaxial to waveguide adapters? (Diamagnetic, paramagnetic or ferromagnetic)
For example, can I use tungsten rod , which has a magnetic permeability coefficient of 1, to build a coaxial transmission line? (What is the appropriate magnetic permeability number for the metal used to have low insertion loss(S21)?)
In the area of electronic banking, including mobile banking, commercial banks improve technological solutions for the use of smartphones for the purpose of conducting financial transactions by clients.
Commercial banks spend the most resources on developing security systems, reducing gaps in online banking systems used by cybercriminals and improving IT systems risk management procedures.
The changes taking place in online banking, including mobile banking, are currently determined primarily by the technological progress related to telecommunications and IT devices.
In view of the above, the current question is: Determinants of the development of mobile banking?
Please, answer, comments.
I invite you to the discussion.
Dear Friends and Colleagues of RG
I described the problem of cybercrime in publications:
I invite you to discussion and cooperation.
Thank you very much
Russian project to explore the moons of Jupiter after 2030 will be based on the nuclear propulsion spacecraft "Nuklon" with an electrical energy power of 0.5 MW. Such energy power gives the opportunity to significantly increase a data transfer performance to Earth. In my opinion, the speed of data transfer can be increase to 100 Mbit/sec. This value will be enough to use 4K Video for the investigation of dynamic processes in the atmosphere of Jupiter and moons. What is your opinion about this?
The problem of data transmission from Mars to Earth is a big latency time. Could quantum entanglement communication reduce this latency?
I am try to build a system model where intelligent reflecting surface is used to enhance the receiver's SNR depending on the position of the receiver.
Based on what I read, a signal is scattered at the atom level and constructive/ destructive superposition is used to direct the signal to a certain user. My question is: Can the signal be directed to a user behind the IRS?
I am working on the project of LC voltage controller oscillator. i have design a LC VCO for C band application. I am facing problem to design the layout of inductor on L-edit of Tanner EDA tool. can anybody help??
As we have seen that most powerful and expensive quadcopters being swept away by prevailing wind gusts and losing connection with the controller, and even that “fail-safe” GPS-enabled Return To Home feature will struggle and oftentimes fail when flying into a strong headwind.
How to make it reliable and robust for sever weather conditions?
We know optical networks are undergoing significant changes. There continues to be increasing demand for bandwidth, just as 10 Gb/s technology has reached maturity, service providers are already installing higher bit rates, including 40 Gb/s and now 100 Gb/s per wavelength and nowadays 400 Gb/s is receiving a lot of attention. The 50 GHz ITU wavelength grid divides the optical spectrum range into fixed 50 GHz spectrum slots, but it is likely that bit rates greater than 100 Gb/s will not fit into this scheme. Even if sufficiently broad spectrum is available, high data rate signals become increasingly difficult to transmit over long distances. So to properly address this challenge, one needs flexible and adaptive networks equipped with flexible transceivers and network elements that can adapt to the actual traffic needs. The combination of adaptive transceivers, a flexible grid, and intelligent client nodes enables a new “elastic” networking paradigm.
I designed MEMS bridges and am now observing the phase shift by checking S(2,1) parameter -angle degree. Is this correct and can I observe the change in phase in HFSS?
I need to add the field of annulus number (area in which sensor is located from sink) which is depend up on the hop count present in HELLO list. So in which file the modifications has to be done, to add the field.
I just came across a problem in power amplifier used in communication chain which exhibits nonlinearity due to memory effects.This can be nullified with a help of digital pre-distortion using signal processing algorithms.
Can anyone please tell how it is achieved and explain the math part behind the algorithm?
Suggestion of book or a research article is preferred.
I am working on transmitting ECG signal over wireless body area networks. According to IEEE802.15.4 standards , I am using ZigBee transceiver at 2.4 GHZ . Complex baseband equivalent channel model is used.
The steps are as follows :
1. Signal Compression
4. OQPSK modulation using the matlab function (oqpskmod)
5. Fading Channel plus AWGN
7. OQPSK Demodulation using the matlab function (oqpskdemod)
8. Decoding and Dequantization
* According to the IEEE 802.15.4 standard, a pulse shaping step is performed in the transmitter after the OQPSK modulation step .
I didn`t perform this pulse shaping process, and I obtained reasonable results. Is it necessary to perform this step ?
If yes , How should the receiver be modified ?
Could anyone please suggest which one is easier to get accepted for conference proceedings inclusion?
Lecture Notes in Computer Science(LNCS), Lecture Notes in Artificial Intelligence (LNAI), Lecture Notes in Bioinformatics (LNBI), LNCS Transactions, Lecture Notes in Business Information Processing (LNBIP), Communications in Computer and Information Science (CCIS), Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering (LNICST), and IFIP Advances in Information and Communication Technology (IFIP AICT), formerly known as the IFIP Series.
I am analyzing the complexity of resource allocation problems in NOMA systems. The network model is shortly summarized as: a base station (BS) and multiple users (UES), singles for all UEs are superimposed at the BS, and the objective is to allocate at the BS so that optimize the resources. In addition, I am using the network sum-rate maximization is a baseline, which is NP-Hard according to my own finding. However, I am not sure about this (NP-Hardness of the sum-rate maximization problem).
Does anyone have any suggestions for me?
Many thanks in advance.
Assuming traffic bandwidth B is equally divided into N subcarriers and each subcarrier may be shared by multiple users in a time-division manner, does the following transmission rate for the k-th user in the i-th cell on the m-th subchannel make sense? Any explanation would be greatly appreciated! Thanks in advance.
Hello!! I have some questions regarding the effects of physical parameters over a UE battery usage. I want to know that what are the factors which increase a user's battery drainage in LTE? What are the effects of Low SINR over UE battery? How does Low received power effects ? Distance from a BS ?? Data size and data rate play any role over battery ?? Or any other factors which need to be controlled for Battery Efficiency.
What do you notice changes in behavior, sociological changes in societies in connection with the advancement of telecommunications technologies?
More and more information is contained in our smartphones? More and more practical information, contacts etc. are archived in smartphones without remembering them.
Once, in the era of fixed-line telephony, people knew by heart the telephone number, whereas now in the era of mobile telephony, mobile, when all information is stored on a smartphone, people remember less and less.
In connection with the above, it is an example of the progressive changes in behavior, sociological changes in societies in connection with the progress of information and telecommunications technologies.
Do you notice these changes?
What are you noticing other progressive changes in behavior, sociological changes in societies in connection with the progress of information and telecommunications technologies?
Antenna design in one software varies with result in another software. Also which one is better for mesh analysis.
Without using triangulation, how might one broadcast a signal that would only be picked up by one antenna out of the many present? Or, if not one antenna, then perhaps just a few close by. These antenna are not stationary. We can use any frequency that we want, although a higher frequency would be best. Each antenna has a slightly different Q, length, and width.
we come to generation that subcarriers are no longer orthogonal to each other. here the different parameters such as amplitude, frequency and phase will change for each subcarrier. by using cognitive radio the spread spectrum is reduced. GFDM plays a major role here. im looking for an MATLAB code or LABVIEW code to analyze this.
anyone related to this work, kindly reply
What is the main difference between dual band and dual radio?
A system equipped with:
Dual Band= 2.4 GHz and 5 GHz
Dual Radio=802.11 and 802.14.5
where 802.11 with 5GHz is deploy between air to air link
and 802.11 with 2.4 GHz between air to ground.
similarly some nodes are also connected through 802.15.4 with 2.4 GHz between air to air.
The above system is dual band dual radio
or triple band dual radio
or triple band triple radio?
I am preparing to simulate a Fiber To The Home FTTH system. My problem is related to the implementation of multiplexing the upstream from the users (ONUs) using OTDMA. At the OLT, I need to demultiplex these signals using the optical gate to get individual data of each user. How to design the optical gate?. the bit rate is 1.25 Gbps and the number of users is 32.
I am looking forward..
If a Journal was not indexed at the time of publication. After few years if that specific journal gets indexed with Scopus or SCI/SCIE. What will be the status of previously published papers?
I have done my B.E in Telecommunication Engineering from Mehran University of Engineering & Technology, Jamshoro. I want to ask about the scope of a Research Assistant in a Public Sector University in Pakistan. I am getting the opportunity to pursue my career as a Research Assistant but I am reluctant to avail this opportunity due to some unnecessary project conditions.
What do you suggest me whether I should avail this or not? Your advice would be highly appreciated.
Thanks in advance :')
I am trying to connect different UAVs in ad-hoc manner.I am interested to use Wimax from the base station to the backbone UAV, that would be further connected with WIFI.
chebyshev band stop filter , order 3
pass band = 140 MHz to 145.5 MHz with 1 dB attenuation
stop band = 149.5 MHz to 150.5 MHz with 60 dB attenuation
I wonder if you could help me with the SNR (end-to-end) expression of a wireless communication system with a detect and forward relay without direct link (please see joined).
For my PhD topic and research, I wish to work on intercell interference mitigation (ICI) in heterogeneous networks (HetNets) using cell range expansion (CRE) in combination with hybrid power control (HPC) techniques. How can I effectively implement this?
Actually, I intend exploiting the advantage of CRE in offloading some users from macrocell to small cells (picocells or femtocells). Thereafter, power control technique/algorithm would be used to mitigate co- and cross-tier interference to offloaded users. I will appreciate any guideline on how to implement this, coupled with any helpful codes, links, textbooks and softwares.
i've noticed that majority of engineers are focusing on the technical side of development of telecom equipment either in mobile communication or any other sub-field , compared to computer networking ,engineers do their best to develop new security solutions !
i don't understand why there's always this lack of interest in security field in telecom !!
Kindly guide me about choosing best simulator for dynamic routing in Adhoc networks.
Can we use Opnet simulation for high level work?
My question is related to underwater acoustic sensor networks.
I have written the attached matlab code to calculate required transmission power based on distance between the sender and receiver and SNR threshold at the receiver(My aim is to calculate energy consumption ultimately). However I get infinity for required Intensity(Req_I) and Required Transmission Power (Req_Pt). Please suggest what is the mistake that is resulting in my required transmission power to be infinity and how can I fix the problem.
As we know that larger the battery capacity, the longer your drone can function in one single charge of it. Small drones are normally best suited for 20 to 30 minutes flight.Our requirements are beyond this i.e longer flight on a single charge.
So what are the possible ways to overcome this issues and to prolong the flight of a small drone?
I am designing a VLC system with DMT. For the channel response, I have chosen BPSK on all subcarriers and calculated the SNR of each subcarrier from BER-SNR relation.
For subcarriers with SNR greater than required SNR for BER of 10^-3, I have increased the number of bits over that subcarrier. (for example if subcarriers SNR is greater than 9.8, I have changed the bits assigned from 1 to 2).For this new bit-loading, I have found that SNR of both QPSK and BPSK loaded subcarriers getting degraded. How can I arrive at a decent bit-loading to maximize the transmission?
Dear and Respected Colleagues
I am requesting to all those respected mentors and researchers working on Optical Communications Please help me on PM to IM conversion to generate UWB pulses?????
I am working on systematic polar codes. But the problem is, after decoding we need to encode the decoded bits again to have the original information.
However, belief propagation (BP) decoding provides soft output. There is a problem again: after one iteration, the output (which would be used as the input of next iteration) is changed. Therefore, if it is used as the input in the second iteration, it generates an error. In this case, what would be the possible solution?
Thanks in advance.
Could anyone show me some approaches for detecting and extracting wideband radar signals in ELINT systems? The receiver bandwidth is about 500 MHz.
I am currently following the time-frequency (T-F) analysis approach. However, I don't know which T-F technique is the most efficient one for this application?
So, could anyone help me in narrowing down the research?
I need more information about Gaussian random variable(X) in pathloss formula in page 3 and 3-2 section in attached paper ( "iM-SIMPLE: iMproved stable increased-throughput multi-hop link efficient routing protocol for Wireless Body Area Networks")
I need range of values of Gaussian random variable Or anything that helps to simulate more...
I am trying to simulate a Cognitive Radio Sensor Network using Matlab. Can anyone be of help with a code for doing this? NS-2 can also be ok.
Thank a lot and be blessed
Mode chart is available for Rectangular, Circular and annular ring shaped microstrip antenna. Does anybody have the mode chart for sectoral microstrip antenna/sectoral dielectric resonator antenna?
Why so many of wireless gadgets operate at 2.4 GHz or 5.8 GHz? What is the reasons for choosing this specific frequencies for ISM bands?
Your answers will be highly appreciated.Thanks
Compressive Sensing is very popular technique to process sparse signal. most of the researchers applying CS technique for DVB-T/DAB or OFDM, GSM based passive radars whose bandwidth is small, whereas FM has huge bandwidth.
if CS is not suitable suggest me any other techniques.
I have generated a DMT signal on AWG (tektronix 70002A) and then used it to modulate LED(the signal is DC-biased to have voltages above LED threshold).
The signal after photo detection is captured on oscilloscope along with the back to back signal from AWG (A direct coax connection between AWG and oscilloscope).
For back-to back connection, the Sampled data from oscilloscope (25000 sample points) is compared with the input DMT signal shape. It is observed that the input DMT signal can be reconstructed by using the samples between 15227 to 16384. Fig1. Thus the start and end points are identified within the above range.
But the signal after photo-detection (Fig2.) is totally unidentifiable for the corresponding start and end points. Will the aforementioned sample points are the start and end points for the detected signal? Does the delay due to optical and coaxial lengths create significant shift in the start and end points between the signals? Any better method to identify the start and end of the DMT signal?
Hello, please I would like to know if it is possible to re-prgramme a commercial SDR like those proposed by OUTERNET (http://outernet.is/) which are designed to receive satellite data so that the SDR receive GSM data?
I am trying to simulate a submarine link by using advanced modulation formats such as 8- and 16-QAM. I know the required OSNR corresponding to those modulation formats, but I know nothing about the maximum launching power (per channel) needed to avoid nonlinear penalties.
I am trying to simulate a very simple wireless communication system. I am giving the description of the system below.
1. The wireless Communication system has one transmit antenna and one
2. The wireless channel is having multipath (In the simulation I have used static
4-tap channel coefficients just for simplicity)
3. I am adding AWGN noise at the receiver corresponding to the snr value (snr
varries from 0 dB to 10 dB. Signal power is assumed to be 1)
4. In the receiver I am using Maximum Likelihood sequence estimation. (I am
using comm.MLSEEqualizer object in MATLAB for implementing MLSE)
Now the problem is when I simulate the program, The BER graph is remaining flat between 0.1 to 0.01 even though I increase the snr to 50 dB.
I really can not understand what mistake I have done. Can someone please help me to solve this problem?
I have attached my matlab program and BER graph for your reference.
I know pricing is a factor but what unique applications require PCR Strip Tubes with Attached Caps. What research application strongly requires this?
I am curious about everybody's take on the state-of-the-art on design and classification of metamaterials. Suppose I wish to identify a metamaterial with a specific permittivity and permeability. Is there a cookbook procedure to identify/design that metamaterial? Is there a way to classify various metamaterials that would aid in such a design effort? What are the fundamental limits? I think I am asking for a periodic table of metamaterials.
As we all experience this that radio waves loses its strength while transmitting through environment. That is why we have to Amplify the signal before and after processing it.Do you have any solution to improve the strength of RF Waves?
I would like to know the heat produced by a typical Base Transceiver Station (without the heat produced by the antenna) and the classical dimensions of the equipment shelter containing it.
Thank you by advance
I am looking for use cases of Group Communication using multicast in M2M communication. For example , group of lights being switched off or on by a single message .