VIAVI CellAdvisor 5G: 5GNR RF Characterisation

Summary

This video tutorial demonstrates the ease of characterizing a 5G signal using the Salvaso 5G analyzer. Key properties like channel bandwidth and beamforming are discussed, highlighting the signal's complexity in frequency and time. The tutorial guides viewers through the process of setting up the analyzer, adjusting the power level, and using a persistence spectrum to clearly identify a 5G signal with a 95 MHz transmission bandwidth and a 28.8 MHz SSB aligned with the channel. For more insights, viewers are directed to Vicom's website.

Takeaways

• 📶 The video demonstrates how to characterize a 5G signal using the VRV Sullivan tool.
• 🌐 Key properties of 5G signals include channel bandwidth, which ranges from 100 to 400 MHz, and the use of millimeter wave technology.
• 📡 Beamforming is a critical aspect of 5G signals, with signals being broadcast in SSV blocks and having a frequency offset within the channel.
• 🔄 Beam signals in 5G are not continuously transmitted but follow a cycle, with beams broadcasted every 20 milliseconds.
• 🕒 Despite the complexity in frequency and time, the Salvaso 5G tool can easily characterize 5G signals using the persistence spectrum method.
• 🛠️ The process begins by accessing the main menu and selecting the real-time spectrum analyzer persistence spectrum option.
• 🔍 Users can set the slicer for 5G measurement either by channel or by frequency; the script uses channel number as an example.
• 📈 The script guides through setting the power level by adjusting the amplitude, including the removal of the default 20 dB attenuator and enabling preamplification.
• 📊 Adjustments on the trace detector are necessary for TDD signals, including peak detection and resolution increase from 1 Hz to 30 kHz.
• 📈 The final result shows a clear 5G signal with a transmission bandwidth of 95 MHz and an SSB of 28.8 MHz aligned with the channel.
• 🔗 For more information, viewers are directed to visit Vicom's website.

Q & A

What is the main topic of the video?

The main topic of the video is demonstrating how to characterize a 5G signal using the Salvaso 5G tool.

What are the key properties of a 5G signal mentioned in the script?

The key properties of a 5G signal mentioned are channel bandwidth, millimeter wave capabilities ranging from 100 to 400 megahertz, beamforming, and the transmission cycle of beams every 20 milliseconds.

What is the range of channel bandwidth for 5G signals in millimeter wave?

The channel bandwidth for 5G signals in millimeter wave can range from 100 to 400 megahertz.

What is beamforming and how does it relate to 5G signals?

Beamforming is a signal processing technique used in 5G to improve signal strength and quality. It involves sending signals out in SSV blocks that can have a frequency offset within the channel but are not distributed across the channel bandwidth.

How often are the beams broadcasted in 5G signals?

The beams in 5G signals are broadcasted every 20 milliseconds.

What is the Salvaso 5G tool used for in the video?

The Salvaso 5G tool is used to characterize 5G signals by analyzing their properties using a persistence spectrum.

How does one initiate the process of characterizing a 5G signal in the Salvaso 5G tool?

One initiates the process by going into the main menu, selecting 'Real-Time Spectrum Analyzer Persistence Spectrum', and assigning a specific title to the measurement.

What are the two methods mentioned for setting the slicer in the Salvaso 5G tool to measure the 5G signal?

The two methods mentioned are setting the slicer by channel or by frequency.

Which band is selected in the video for characterizing the 5G signal?

In the video, the 5DNR band is selected for characterizing the 5G signal.

How is the power level set in the Salvaso 5G tool?

The power level is set by making adjustments on the amplitude, including removing the default attenuator of 20 dBs and enabling the preamplifier for increased sensitivity.

What adjustments are made to the trace detector for analyzing a Time Division Duplex (TDD) 5G signal?

For analyzing a TDD 5G signal, adjustments are made on the trace detector to peak, and the resolution is increased from 1 Hertz to 30 Kilohertz.

What is the transmission bandwidth and SSB of the 5G signal shown in the video?

The transmission bandwidth of the 5G signal shown in the video is 95 megahertz, and the SSB (Sub-Spectrum Block) is 28.8 MHz, which is aligned with the channel.

Outlines

00:00

📶 Characterizing 5G Signals with VRV Sullivan

In this video, the presenter introduces the process of characterizing 5G signals using VRV Sullivan. Key properties of 5G signals, such as channel bandwidth ranging from 100 to 400 MHz and the use of beamforming in millimeter wave, are highlighted. The video demonstrates how to use the persistence spectrum feature of the Salvaso 5G device to analyze these signals effectively. The presenter guides viewers through the steps of setting up the real-time spectrum analyzer, choosing the right measurement title, and configuring the device to measure by channel number. Adjustments to the power level and signal sensitivity are also discussed, including the use of a preamplifier to enhance the signal visibility. The video concludes with the successful visualization of a 5G signal with a 95 MHz transmission bandwidth and a 28.8 MHz SSB aligned with the channel.

Keywords

💡5G

5G refers to the fifth generation of mobile networks, offering significantly higher data rates, lower latency, and increased capacity compared to the previous 4G networks. In the context of the video, 5G is the main subject, with a focus on characterizing its signal properties and measurement techniques, such as channel bandwidth and beamforming.

💡Channel Bandwidth

Channel bandwidth is the range of frequencies available for a signal to be transmitted over a communication channel. In the video, it is highlighted that 5G can have a channel bandwidth ranging from 100 to 400 megahertz, which is a key property for understanding the capacity and performance of 5G signals.

💡Millimeter Wave

Millimeter wave (mmWave) is a band of frequencies in the electromagnetic spectrum that is used for wireless communications, particularly in 5G networks. The video mentions that 5G channel bandwidth can utilize mmWave frequencies, which are known for their high data rates but limited range and penetration capabilities.

💡Beamforming

Beamforming is a signal processing technique used in wireless communication to direct the signal energy towards a specific receiver, improving signal strength and quality. The script explains that in 5G, beamforming is used to broadcast signals in SS/PBCH blocks, which is a method to enhance the signal's reach and efficiency.

💡SS/PBCH Block

SS/PBCH stands for Synchronization Signal/Physical Broadcast Channel block, which is a part of the 5G signal structure used for synchronization and broadcasting system information. The video script mentions that these blocks are not distributed across the entire channel bandwidth but can have a frequency offset, indicating their role in signal synchronization and information dissemination.

💡Frequency Offset

A frequency offset refers to the difference between the actual frequency of a signal and its nominal or expected frequency. In the context of the video, the frequency offset within the channel is discussed as a parameter that can be adjusted to optimize the 5G signal characteristics.

💡Time Division Duplex (TDD)

TDD is a method used in telecommunication for the transmission of signals in two directions over a single channel by dividing the signal into time slots. The video script refers to TDD signals, indicating that the 5G signal's beams are broadcasted in cycles every 20 milliseconds, which is a characteristic of TDD operation.

💡Persistence Spectrum

Persistence spectrum is a method used to analyze and visualize the spectral characteristics of signals over time. The video demonstrates how the Salvaso 5G tool can use the persistence spectrum to characterize 5G signals, providing a clear view of the signal's behavior and properties.

💡Real-Time Spectrum Analyzer

A real-time spectrum analyzer is a device that can measure and display the spectral content of a signal as it changes over time. The video script describes using the real-time spectrum analyzer's persistence spectrum feature to analyze the 5G signal, emphasizing its capability to handle the dynamic nature of 5G signals.

💡Preamplifier

A preamplifier is a device that increases the amplitude of a signal without distorting its shape. In the video, enabling the preamplifier is mentioned as a step to increase the sensitivity of the measurement, allowing for the detection of weaker 5G signals.

💡Trace Detector

A trace detector is a component of a spectrum analyzer that identifies the presence and level of signals within a specific frequency range. The video script discusses adjusting the trace detector settings to optimize the detection of 5G signals, particularly for TDD signals.

💡Resolution

In the context of a spectrum analyzer, resolution refers to the ability to distinguish between two closely spaced signals. The video script mentions increasing the resolution from 1 Hz to 30 kHz to clearly identify the 5G signal's characteristics, such as its transmission bandwidth and SSB.

Highlights

Introduction to characterizing a 5G signal with VRV Sullivan.

Key properties of a 5G signal include channel bandwidth and millimeter wave capabilities.

Beamforming is a critical feature, with signals sent in SSV blocks.

SSV blocks are not evenly distributed across the channel bandwidth but allow for frequency offset.

Beam signals have a transmission cycle, broadcasted every 20 milliseconds.

Salvaso 5G can characterize 5G signals using the persistence spectrum method.

Accessing the real-time spectrum analyzer and persistence spectrum from the main menu.

Assigning a specific title to the measurement for clarity.

Measuring the 5G signal by channel or frequency, with a demonstration using channel number.

Selecting the 5DNR band and entering the channel number for the signal under test.

Adjusting the power level by removing the default attenuator and enabling preamplification.

Observing the signal in persistent spectrum and adjusting the trace detector for a TDD signal.

Increasing the resolution bandwidth from 1 Hz to 30 kHz for clearer signal visibility.

Identifying a 5G signal with a 95 MHz transmission bandwidth and a 28.8 MHz SSB aligned with the channel.

Invitation to learn more about the process on Vicom's website.

Transcripts

hello everyone

in this video we're going to show how

easy is to characterize a 5g

signal with vrv sullivan

there are a couple of key properties in

a 5g and our signal

first is channel bandwidth in millimeter

wave

it can go from 100 to 400 megahertz

second is beamforming being broadcast

are being sent out in ssv blocks which

are not distributed across the

channel bandwidth but you can have a

frequency offset

within the channel

also the beam signals are not constantly

transmitted

so they have a cycle so we look at the

signal in time

the beams are being broadcasted every 20

milliseconds

despite this complexity in frequency and

time

the salvaso 5g can easily characterize

these 5g

signals using persistence spectrum

first we go into the main menu and

select

real-time spectrum analyzer persistence

spectrum

and select a specific title that we want

to assign to that measurement

there are a couple of ways that we can

set the slicer 5g

to measure the 5g signal

by channel or by frequency

in this case we're going to get it done

by channel number

so we're going to be selecting the 5dnr

band

and then we're gonna just enter the

corresponding channel number

of the signal under test

then we're gonna set the power level by

making adjustments on the amplitude

one of the first items is to remove

the attenuator by default is 20 dbs

and we have a little bit of a signal but

we need to increase the sensitivity so

we're going to enable the preamplified

now we can see the signal in persistent

spectrum

but since it's a tdd signal we're gonna

make adjustments on the trace detector

to peak and the other adjustment that

we're gonna make

is increase the resolution going from

one

hertz to 30 kilohertz

now we can clearly see a 5g in our

signal with a transmission bandwidth of

95 megahertz

and the ssb of 28.8 mhz that is

aligned with the channel

find out more at vicom's website