Tagged Questions

0
votes
1answer
36 views

Erlang B telecom system (grade of service)

I am bit stuck with an answered question that I found online: We have an Erlang B system where the total number of served call is 15.48 erlangs. The system contains 23 circuits. The incoming calls ...
-1
votes
0answers
44 views

Wake up a node wirelessly [closed]

I have an RF UART module device which is sleeping (master device). I can wake it via a timer and force it connect to any available slave-nodes and talk via RS232. However, I am wasting battery this ...
0
votes
1answer
51 views

why does signal attenuation caused by shadowing vary?

Given a RF sender and a receiver, suppose the obstacles between them are fixed, both their material and dielectric properties, does the signal attenuation caused by their shadowing vary over time? If ...
2
votes
0answers
45 views

why is shadow fading also called slow fading and large-scale fading?

I've encountered several similar claims regarding shadow fading on several books, and have some difficulty understanding them. (1) Shadow fading is called slow fading because the duration of the fade ...
1
vote
1answer
26 views

Power delay profile and broadband bus

I came across the following solved question, but I have trouble understanding part of the solution. If anyone could shed some light into this I would be really grateful since this problem has been ...
-3
votes
2answers
92 views

Free space model (wireless communications)

The received power at a given distance = 1km is 1nW . Find the received power at a distance of 5km from the same transmitter , using the Free Space Model. Suppose that frequency is 1800Mhz, ...
2
votes
2answers
67 views

Realizing an flexible, but fault tolerant, infrared communication chain

The task fell on me to realize a wireless, daisy chained communication system. The communication must be wireless, esp. via infrared diodes. The end of the chain is connected to a PC (wired). The ...
-5
votes
1answer
66 views

Receiving videos via wifi [closed]

I'm working on a electrical board that should receive videos from a server via WIFI. The size of the video is around 100 MB..it will be stored afterwards into an SD card ...so my question is what WIFI ...
-3
votes
2answers
76 views

How to send information over large number of client?

I have one master which needs to send information to lots of slave device ~1000 which needs to receive same information. As I need to power all of the slave device, I was thinking of using same wire ...
-1
votes
1answer
79 views

How is (non-interfering) data communication possible over the tv spectrum? What is the technology used?

I've heard that FCC-US (Federal Communication Commission - United States) has approved the free usage of TV spectrum for wireless communication. How is it possible to enable such data communication ...
0
votes
1answer
67 views

Calculating the model complexity for wireless sensors

I am coming from geoinformatic background and I do not know anything about the electrical issues. I have a model for outlier detection for wireless sensor and I want to assess the energy complexity ...
-1
votes
1answer
86 views

Mapping of TDMA frame on to E1 frame

In a GSM network TDMA frame is used to transmit information between Base station and Mobile staton and E1 frame is used as the media to carry information to and in the Backhaul. How is th TDMA frame ...
1
vote
1answer
209 views

how much bandwidth does a phone call require and how much is the capacity of a single E1?

How much is the bandwisth requirement for a phone call connection? Considering a non-channelized 1 with 32 time slots how many calls can an E1 support? Say its 'n'. Does that mean n+1 call will not ...
-2
votes
2answers
74 views

Is an analogue repetition a feasible/desirable novel technique for reducing latency in an OFDM link-based dense mesh network [closed]

In order to minimize latency across multiple hops in a (OFDM) wireless mesh network, the ability to simply pass-on a wireless signal without full demodulation and remodulation could eliminate ...
1
vote
0answers
17 views

How to choose the right premble time, acknowledgement time as a percentage of total cycle time in X-MAC Protocol in 802.15.4

I am working on an analytic model for X-MAC, I came across some important duration and I am confused how to select them. cycle_length = one complete cycle (per transmission) in ms ...
1
vote
4answers
974 views

Basic microcontroller + RF transmitter/receiver plausibility

I am a complete beginner (I have only gone through the beginners book to Arduino + done a few small projects). I want to know if it's possible to connect a very basic/cheap microcontroller like the ...
1
vote
1answer
633 views

Cheapest 5 meter wireless communication + microcontroller [closed]

I want to have two microcontrollers wirelessly communicate with each other (about 5 meters) (cheapest is radio or Bluetooth, right?) and then beep/blink an LED, etc. depending on whether or not there ...
0
votes
0answers
51 views

Solution for increasing full douplex wireless communication range

I am not relevant with English but i hope that i can explain good my problem. I am planning to design a full duplex wireless communication link. Transceivers send and receive data. As i am interested ...
0
votes
3answers
278 views

Suggestions for a Point-to-Point reliable Wireless Communication Module

I've to implement a wireless communication system. Details are as follows. Range is about 600m Point-to-point communication No LoS is available. (but not highly obstructed) Won't need much higher ...
2
votes
1answer
149 views

Selecting a transceiver module for a wireless communication system [duplicate]

Possible Duplicate: Suggestions for a Point-to-Point reliable Wireless Communication Module I got a project to design a wireless communication system in order to communicate between the ...
1
vote
5answers
244 views

What is the cheapest way for two devices spaced less than 10 feet apart to communicate wirelessly with each other?

I'm building a musical instrument that comprises of two separate devices...one device is the master...has an accelerometer and a speaker. The master's buddy device also has an accelerometer. When the ...
2
votes
1answer
182 views

Understanding the OSI Model

I'm currently documenting a wireless, microcontroller-based system that I've built and I would like to use the standard industry terminology to help anyone who comes behind me comprehend it easier. ...
8
votes
4answers
944 views

What is a good communicaton device among teensy and arduino besides “XBees”

I have been using XBees to communicate my teensies so far. However, as you know, XBees are really expensive and when I want multiple devices to communicate with each other, I have to pay for several ...
2
votes
4answers
283 views

How does Near Field Communication protect from unwanted long-distance communication?

According to Wikipedia Near Field Communication is intended for short-distance communication - something like less than a meter. I wonder how could this limitation be enforced? Usually there're these ...
9
votes
6answers
3k views

Wireless communication between more than two Microchip PIC microcontrollers

I would like to create wireless communication between Microchip PICs for my simple project. It's actually an one way communication but there is one server and more than one client (about 2-4, all ...
5
votes
3answers
506 views

Rather complicated sensor network

I was working on a project recently and it was the first one which was involved enough to make the sensor networking complicated. In the end, I think the communication was the bottleneck in terms of ...
3
votes
2answers
786 views

MRF49XA Microchip Transceiver

Does anyone have any experience with the Microchip MRF49XA sub 1GHz transceiver? I have been trying to get one of these to talk to a pic16f886 over the last week or so over SPI and having no luck ...
2
votes
2answers
989 views

Combine a low power XBee receiver with high power XBee transmitter in a model rocket

Have got some existing low power 2mW XBee series 2 with an Explorer that I've used successfully to communicate between a PC with the XBee Explorer and a remote Arduino based project. I'd now like to ...
6
votes
9answers
1k views

What are the ways I can make my circuit communicate with a computer?

I am a novice at electronics hacking. I would like to know how I can make a circuit communicate with a PC. Take for example, a simple circuit, with one LED and a switch. The switch on the circuit ...
7
votes
6answers
4k views

Wireless communication over long distances

Would like to communicate between an Arduino and a PC but over a distance of 2500+ feet outside in the open, wirelessly. What would be the best way of doing this? The communcation devices I have ...