Questions tagged [lte]

LTE - Long Term Evolution - is a wireless cellular system

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votes
3answers
109 views

Impedance matching through via and signal trace of 2 layer board

Due to tight space constraints I need to pass my LTE signal (800-1800 MHz) through a via. The proximity between the antenna connector and the modem is very short (literally on the other side of the ...
2
votes
1answer
38 views

How do LTE radio networks deal with co-channel interference?

In 802.11 Wifi, I've read that a wifi adapter (like my laptop's wifi adapter/radio) will use Energy Detection to see if a channel is busy (if a certain energy threshold is detected on the channel, it ...
2
votes
1answer
49 views

Calculate power of an LTE Signal

I am looking for the formula to convert the power level of an OFDM RF signal to an absolute power level. For example if I have my typical rectangular RF spectrum and the bandwidth of the signal is ...
1
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3answers
54 views

Does data rate depends on Frequency not on BW?

If we have two RF signals of 900Mhz and 1800Mhz both of equal Bandwidth 20Mhz which one has higher data rate?
1
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1answer
54 views

How are LAN routers, WAN routers and eNodeBs connected to each other (TCP/IP)? [closed]

I'm new to telecommunication, and from what I understand, an user equipement is either connected to a LAN router or an eNodeB, and a LAN router is connected to a WAN router, and routers send the ...
1
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1answer
89 views

Is NB-IoT roaming possible?

I found a comment on a blog post stating that NB-IoT doesn't support roaming: nbiot do not support roaming (you must have sim from the operator that have the infrastructure). nbiot also lacks support ...
1
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2answers
987 views

Why are there two LTE antennas?

I have a design with LTE CAT 4 and I wonder why two antennas are needed. I searched around the web but am still kind of confused. Below are my questions: Is the second antenna used for Rx only? Is ...
1
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1answer
61 views

Not getting expected band pass filter response

I am trying to make a LTE signal repeater and trying to filter all other signals except the band 3 (869 - 894 MHz) This is what I am getting: This is the circuit: ...
1
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1answer
197 views

How to connect CPU with RGMII pins to an LTE module that takes only SGMII signals?

The Hi3519 Hisilicon CPU has RGMII pins. We are trying to connect it to the EC21 LTE Module from Quectel which contains SGMII pins. Would using two Realtek RTL8201F-VB-GG PHY chips with magnetics ...
1
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1answer
25 views

Current waveform for LTE transmit

I am designing an IoT system which uses the SIM7000A. In the SIM7000 series datasheet it says that the highest possible current for LTE is under 200mA (section 5.4 of SIM7000 Hardware Design_V1.03). ...
0
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1answer
44 views

PCB with 5 Pluggable RF modules and 1 LTE puggable module - will it cause issues for reception at different antennas?

I am designing a prototype PCB which shall have 5 pluggable RF modules and one 4G LTE module as shown in the image The Base board size shall be 240 x 140 mm, RF board size is 40 x 50 mm and LTE board ...
0
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1answer
37 views

Getting 4G/LTE signal through sheet metal - opening/aperture size needed?

We have a storage area, that is surrounded by corrugated sheet metal. (Appears to be galvanised steel, and probably 2-3mm thick). Inside the sheet metal, we have a LTE/4G router, on the Telstra ...
0
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2answers
39 views

What is meant by downstream bandwidth in lte?

In my phone, it says that the downstream bandwidth of LTE is 10Mhz. But if a carrier frequency of 900Mhz has a bandwidth of 20Mhz, i.e., frequency ranges from 900Mhz to 920Mhz, then I have almost half ...
0
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1answer
50 views

Which LTE band should I use?

Background I am designing a basic IIoT device. When the sensor detects the parameter of interest, it transmits a message using an LTE modem. The modem is capable of Cat-M1 and NB-IoT, and I want to ...
0
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0answers
21 views

How do I know more about the 3GPP release version info with decimal numbers?

Can someone help me understand the decimal numbers in the 3GPP release here after 12? This is an example. Intuitively I can tell they are incremental releases, later ones have higher numbers after ...
0
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2answers
59 views

Is MIMO equivalent to link aggregation?

Is MIMO the wireless version of link aggregation in wired networks? I'm not asking if MIMO is a similar link aggregation protocol like LACP or PAgP. What I'm asking is, if it is the same concept as ...
0
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0answers
17 views

Do all random access procedures and packet transmission in NB-IoT happen during one Nprach-periodicity?

I have two questions about random access procedures of NB-IoT In NB-IoT, Nprach-Periodicity is the amount of time between two consecutive random access transmission attempts. Random Access procedures ...