Science topic

# Wireless Computing - Science topic

Explore the latest questions and answers in Wireless Computing, and find Wireless Computing experts.

Questions related to Wireless Computing

If a person wants to start a career all over again to do research and phd from scratch in the area of wireless network, what are the basic skills and ideas needed for it

Can you tell me the bands allotted for 5G systems

Frameworks such as Apache Storm, Flink, Heron and Spark were developed to run on clusters or cloud. These such kinds of infrastructures do not have memory, CPU and bandwidth limitations. In contrast, computing resources at the network edge are constrained regarding their capabilities. I am aware of the Apache Edgent and Nifi frameworks. However, they were conceived to run locally on a single computing resource. If you want to run them in a distributed infrastructure, you might create your own stack of components (broker + framework).

I was going through mac protocols and wondering what will be a suitable MAC protocol for UAV swarm while conducting a mission.

Any idea?

As we know that, throughput is amount of transferred data for a specific time. I want to fix data size and make time variable. The definition will be "The amount of time required to transfer a specific amount of data". What is the term for this?

Thanks in advance.

Any differences between spectrum access protocols and medium access protocols

I am trying to simulate the issue of energy efficiency in 5G using Discrete Event Simulation (DES). I am struggling to find a way how to abstract the issue of resources allocation. How can I transfer the issue into code? I am doing the simulation using JAVA language. Is there anyone have an idea how can I do that, please?

Note:

The research based on this paper " Energy-Efficient Power Control: A Look at 5G Wireless Technologies "

we have an architecture consist a three tier: tier 1 consist terminal nodes, tier 2 consist fog nodes, tier 3 consist cloud server . We have given two equation, one is the service delay in fog and the other is the service delay in cloud. In addition, we have given some parameters that we should use to calculate these equations. you can find the equations is attached file. the following is the given parameters:

In the system, the number of fog node=10, which connected to a single cloud service provider.

The terminal node are assumed to be uniformly distributed among the virtual cluster VC.

Data generation rate from each terminal node being 1 packet/s.

Length of each data packet is taken as 65,536 and bytes and the machine instruction size is assumed to be 64 bits.

Processing speed of the devices at the fog computing tier= 1256 MIPS.

Processing speed of the devices at the cloud computing tier= 124,850 MIPS.

Please help me using these parameters to calculate the two equations. I'm not able to find the relation between the required parameters to calculate the equations and the given ones!.

I am researching throughput of random access with capture.

I am wondering throughput of S-ALOHA considering frequency reuse factor?

In my opinion, the throughput becomes FG exp(-FG), where F is frequency reuse factor and G is transmission attempt per unit time. From that equation, the maximum throughput is not changed even when F is changed.

However, i thought if the freq. reuse factor increases, the max. throughput decreases.

Does anyone have any idea for get throughput of S-ALOHA considering frequency reuse factor?

Most common low-cost Bluetooth modules used in micro-controller based projects are limited to around 1 Mbps thru Serial Port Profile (SPP). In addition, while the modules can transfer short data packets at all baud rates, they halt or fail completely when trying to achieve sustained high data rates. How to successfully transfer/stream data at all available baud rates for prolonged period of time? Are there any other feasible options for use i.e. different profile of Bluetooth in this case?

Does two eNBs in LTE networks communicate using wireless medium or wired medium?

If graph

*G(V, E)*represents femtocell topology where vertices*V*and edge set*E*show femtocell and their*interfering*relation respectively. We may say, there is an edge between two femtocells if their distance is less than 2*R*. Considering this scenario of the femtocell, can we model the femtocell as a unit disk graph?Dear researchers?

I am a bit confuse about, when we do scheduling algorithm high proirity for something, the scheduling happened before data buffer or after?

I am wondering, if the data buffered and and buffer size is full, is that able to replace packets in the buffer with new data comes with high priorty?

Thanks

I found some scholars clarified that the relationship between the Shannon transform and Stieltjes transform with

\begin{equation}

\frac{\gamma}{\log e}\frac{d}{d\gamma}\mathcal{V}_N(\gamma) = 1 - \frac{1}{\gamma}\mathcal{S}_N(-\frac{1}{\gamma})

\end{equation}

However, other scholars claimed that this equality was modified as

\begin{equation}

\mathcal{V}_N(x) = \frac{1}{N}\log \det (\mathbf{I}_N + \frac{1}{x}\mathbf{B}_N) = \int_{0}^{+\infty}\log (1+\frac{\lambda}{x})dF_N(\lambda) = \int_{x}^{+\infty}(\frac{1}{\omega}-\mathcal{S}_N(-\omega))d\omega

\end{equation}

Here $\mathcal{S}_X(.)$ denotes the stieltjes transform, whereas $\mathcal{V}_X(.)$ is the shannon transform. So how can I obtain the last equation from the first equation?

***I mean, given that***

\begin{equation}

\frac{\gamma}{\log e}\frac{d}{d\gamma}\mathcal{V}_N(\gamma) = 1 - \frac{1}{\gamma}\mathcal{S}_N(-\frac{1}{\gamma})

\end{equation}

***How can I obtain this***

\begin{equation}

\mathcal{V}_N(x) = \int_{x}^{+\infty}(\frac{1}{\omega}-\mathcal{S}_N(-\omega))d\omega

\end{equation}

I did some calculations, but not sure that they are equal.

As there is no topology called best topology for all engineering Applications, I would like to study different network topologies applied in different engineering field. I would like to make worth discussion to analysis different topologies with advantages and disadvantages. Can one suggest good book to study different Network Topologies and their Applications in different Engineering?

Expect to hear a whole lot more about Li-Fi - a wireless technology that transmits high-speed data using visible light communication (VLC) - in the coming months. With scientists achieving speeds of 224 gigabits per second in the lab using Li-Fi earlier this year, the potential for this technology to change everything about the way we use the Internet is huge. Now, scientists have taken Li-Fi out of the lab for the first time, trialing it in offices and industrial environments in Tallinn, Estonia, reporting that they can achieve data transmission at 1 GB per second - that's 100 times faster than current average Wi-Fi speeds.

I need the codes that can enable my software to communicate with pressure sensors.

Thank you!

I'm doing research and need to divide the frequency range of LTE in sub-bands but I do not know the starting point and the end point of this band that I used. The experience that I am doing is the following:

Track 1 = Downlink 1920-1940 - Uplink 2110-2130 - Bandwidth 20 MHz

Track 2 = Downlink 1940-1960 - Uplink 2130-2150 - Bandwidth 20 MHz

Track 3 = Downlink 1960-1980 - Uplink 2150-2170 - Bandwidth 20 MHz

which band can I go to? If I try to 10MHz bandwidth, can there be more interference?

Can anyone can help me? Thank you very much.

In slowly varying environments, AR-models can be used for channel tracking. But in highly non-stationary environments, such as vehicular channels, these models do not apply. What are the alternative algorithms used for vehicular channel tracking and prediction? Are there any good references for that?

Thank you,

The question may be stupid but it really confuses me for a long time.

I read a lot of papers in wireless sensor network. Many researchers model their problems into the form of ILP. However, ILP is NP-Complete so it is not efficient for solving a problem.

**So why people write their problems into the form of ILP? Do they do that to make their problem clear to see and easy to understand? Or do I make some mistakes understanding the relations between ILP and NPC?**

I am really appreciated that you can help me to solve this question.

I want to implement a Chebsyhev fourth order transfer function. I don't want the impedance values and scaling procedure. What I want is the procedure to implement any fourth or higher order transfer function using passive elements only.

In wireless mesh networks, how do I decide the packet transmission with improved throughput under power constraint?

i want to run parallel cloudlet or bulk data in cloud computing which is the best energy efficient technique for this available in cloud computing

token bucket gives token to each node to get connected in network, to transfer data .

when some node need to communicate in network (emergency case), where its stacked in network in other position based on token.

i need any alternate used to consider emergency case , to rearrange the token , or suggest me with alternate algorithm which consumes less energy in energy limited environment like polar regions.

thanks in advance

Could you please help me how i can generate an independent sample fast fading from Rayleigh distribution (NLOS) and the Rician distribution (LOS), I can the correlation in time due to mobility and also the correlation in frequency due to the multipath delay profile. i just need to get a statistically reasonable fading model.

and some information about Jakes model.

Thank you

Hi every body.

as you know, some papers set a packet size and a time slot length in the simulations to calculate the packet delivery rate. but didnt describe the scenario in details. the question is : does a complete data packet is transmitted in a single time slot ? or multiple slots are needed to transmit a packet.

thanks in advance

What kind of path loss model will be considered for mm Wave communication

I have 2 IEEE 802.11e network scenarios and i need to know the difference between them. One is a network where we assume stations transmit only one traffic type, say 4 stations and one transmits video, another transmits voice, another data, like that and the second scenario is where each station transmits all 3 or 4 traffic types. Question is:

1. How is throughput analysed/affected in 2nd scenario considering each STA has multiple EDCAF.

2. How do i analyse transmission probability on the channel?

if we have 2 devices like walky talky and mobile phone, for a particular situation, is it possible the mobile to use the channel allocated to walky talky to send data/information ?

Say I have some device which can store data but does not have any capability to send/receive, but my second device from far away places like, say 1km or so should be able to receive the data from the device wirelessly.

I mean every technology like Bluetooth, satellite, wifi etc require both the device able to send and receive. But I am in find of a system mentioned below

Does anybody know how Balise works and its internal mechanism ?

I would like to use a wifi protocol for image transmission. I am planning to use 802.11p or ac. I would like to know the important differences between these two so that I can finalize a suitable one for my outdoor application. Thanks in advance.

I am working in WSN. While my implementaion, I am facing the lifetime of the sensor node. Any one help me to overcome this.

I need to analyse their performance in terms of job completion time and if possible potential interference of wireless links.

How to determine the weight of a link in wireless mesh network and the criteria behind ??

We work on cross platform mobile development. We need to compare our work to others. What are the available programs (open source or evaluation version) of cross platform mobile development? Is there any metrics that can be used for comparison other than percentage of accepted lines of code?

I want to find the position of slave device with respect to master device by using bluetooth? consider a scenario in which on master device called laptop having bluetooth and another slave device cell phone also having bluetooth facility. I want to find the distance between these two devices along with the direction of slave with respect to the master i.e. laptop.can is it possible?

How could be the precoder matrix be designed for spatial modulation transmitter and receiver.

OFDM was selected by many standards for wireless mobile networks like WIMAX and LTE. OFDM has advantages of simple receiver with the ability to combat ISI. It can also provide more capacity because of its orthogonal narrowband subcarriers. I like that we highlight more the advantages and disadvantages that OFDM provides compared to other modulation and multiple access techniques of the past such as WCDMA, multi carrier CDMA and TDMA techniques as well as to other techniques suggested in the literature and whether future networks will continue to rely on OFDM/OFDMA or not.

Should it be implemented at the card's driver file? Or at the OS kernel? Which files should be modified?

I want to simulate 802.11n frame aggregation. Can we simulate this using NS2. Is there any kind of patching required for the same.

Please tell me how to do this.

Thanks & Regards,

Conference Paper Simulation research of 802.11n channel model D in NS2

There are a lot of tools used for these purposes. I would like to know the most important and widely used tools currently.

I'm working on a project on OFDM systems over time-varying Rayleigh fading channel. The repetition encoder and interleaver are used. I was asked to compare the theoretical BER for diversity order 1,2,3 using maximum ratio combining, but I don't know how to do it. How can I simulate the BER for different diversity order?

Mainly used in Satellite system with GPS