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Frequently Asked Questions about 5G | 1G to 5G, Side Effects, Modulation ...


5G Technology Questions and Answers

Following questions were raised by anonymous website visitors or readers to the online publishers. We'll check up a few queries among them below.

General 5G Questions

Reason behind change in network upgradation from 1G to 5G?

In a nutshell, the answer to this issue is that bandwidth demands are increasing. The bandwidth allotted to a specific service, for example, is fixed. Now, if the number of devices linked to the internet is growing by the day, what would you do to meet the increasing bandwidth demand?

As a result, every few decades, a whole new G (or generation in cellular wireless communication) appears to meet the required requirements. Read More ...

Does my PDA support 5G?

It is entirely dependent on the mobile or cell phone's operational frequency band. More specifically, the frequency band that your mobile antenna receives or broadcasts is determined by your antenna.

Can a CSE study 5G courses?

Prerequisites to pursuing a 5G course:

You must have some good understanding in previous G's especially in Telecommunication to pursue a 5G course. Here concept of cell, operating frequency, infrastructure all are different as compare to 3G or 4G network.

You must have basic knowledge about wireless channel model, modulation schemes used in 3G and 4G, antennas used in those technologies, etc. Knowledge on 5G MIMO Technology, SVD, UWB or millimeter wave is a big plus.

Any side effects of 5G cables overhead my house?

No

Any side effects of 5G cell tower around my house?

In reality, cell towers emit radiation at a level that is safe for humans. Only when you receive a call or your signal level drops, the cell tower provides more power to your phone. However, that power is also below the standard of safety.

5G Signal Processing & Technical Concepts

1) What waveform is used in 5G NR and why?

5G NR primarily uses CP-OFDM for both uplink and downlink.

  • Handles multipath fading efficiently
  • Supports high data rates
  • Flexible numerology

In uplink, DFT-s-OFDM is used to reduce PAPR.

2) What is Numerology in 5G?

Subcarrier spacing formula:

Δf = 15 × 2^μ kHz

μ = 0,1,2,3,4

3) Massive MIMO

Massive MIMO uses large antenna arrays (e.g., 64, 128 antennas).

  • Beamforming gain
  • Spatial multiplexing
  • Increased capacity

4) Beamforming

Beamforming focuses signal energy in a specific direction using antenna arrays.

y = w^H x

5) Channel Estimation in 5G

  • DMRS
  • SRS
  • CSI-RS
H(k) = Y(k) / X(k)

6) PAPR

PAPR = max|x(t)|² / E[|x(t)|²]

7) LDPC and Polar Codes

  • LDPC – Data channels
  • Polar Codes – Control channels

8) LTE vs 5G Comparison

Feature LTE 5G
Numerology Fixed 15 kHz Scalable
Coding Turbo LDPC + Polar
MIMO Up to 8x8 Massive MIMO

9) What is mmWave?

Millimeter wave band provides huge bandwidth and ultra-low latency. Wavelength spans between 10 millimeter to 1 millimeter.

10) Role of FFT in 5G

  • Demodulation
  • Equalization
  • Channel estimation

Internet of Things (IoT)

How is career in IoT?

IoT professionals have a bright future. It can be used in home appliances, industries, hospitals, fleet management, traffic control, smart cities and more. Read more...

Which workshop is better for CSE students either IoT or robotics?

IOT based solar panel enabled extension box

The compact sensors with IOT is going to make huge impact in patients life

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