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Questions tagged [3g]

The tag has no usage guidance.

0
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0answers
19 views

Differences between OFDM, OFDMA and SC-FDMA?

I understand that - multiple user scenarios lead to OFDMA in SD-FDMA at any point of time, all subcarriers carry the same symbol. What I want is to understand on what exactly differentiates them.
-2
votes
1answer
127 views

How is 4g much faster than 3g? [closed]

The data rate for 3g is up to 2Mbps but for 4g it's up to 20 Mbps or more. But the frequency Band of 3g is 1.8 - 2.5 GHz but for 4g it's 2 - 8 GHz. I understand that increasing the frequency band ...
4
votes
1answer
167 views

M2M vs normal SIM cards

I recently bought some global 3G modules from Digi International and wanted to test one of them with the SIM card from my phone. I was surprised when I saw the module couldn't connect to the network....
21
votes
6answers
2k views

What drives the advancement towards ever faster cellular network speeds? [closed]

I've always accepted that technology advances. Being born in the 90s, everything just becomes faster, smaller, cheaper and generally better if you wait a few years. This was most obvious with consumer ...
-1
votes
1answer
55 views

Can a 3G usb modem be used as a mini Cellphone Tower [closed]

I am curious to know whether small USB 3G modems could be used as cellular towers, and if you would need special firmware to do it or if it is not possible at all. They can communicate with the tower, ...
0
votes
1answer
665 views

SIM800L - No response while sending AT commands

I'm new to this arduino world. I'm trying to communicate with my arduino nano and SIM800L. I read few things in the internet and found a basic code. I tried copying it and tried to work it out, but I'...
1
vote
0answers
199 views

LTE vs 3G power cost at low speed

I am currently working on a device in which I need to implement internet connection. For that I intend to use a GSM module, for example this one: SIM5320. This is a 3G module. I have been reading ...
1
vote
1answer
5k views

SIM800L not responding to AT commands

I am on a very exciting project, by the SIM800L module is resisting hard ! The hardware : clone arduino nano (dx.com) SIM800L module + antenna (dx.com) Lipo battery 3.7V 150mAh (letmeknow.com) The ...
2
votes
3answers
336 views

SimCom SIM5360 sharing SD card with uController

I am designing a data logging system that uploads its data via 3G. I'm going to be sampling an I2C sensor at 10Hz, buffering this in local memory (or FRAM), and then dumping the contents of the ...
0
votes
1answer
3k views

How do I send data over TCP from a SIM5320A?

NOTE: I have been using this as a reference. After recently purchasing a SIM5320A breakout board (the board) I have been trying to connect it to a TCP server. After having to connect the board to an ...
0
votes
1answer
35 views

Can I deal with the differents standards of 3G? And of 4G? [closed]

I have a very popular device (a smartphone) which works on 3G: TD-SCDMA 1880/2010 standards and 4G: LTE 1900/2300/2600. I want to turn it compatible with 3G: UMTS 900/2100 or, if not possible, with 4G:...