Understanding Channel Power

[@lucianodonghia7043]

Cristal clear! Thank you

[@pauldenisowski]

Thanks!

[@Tom-dn5de]

@Paul Denisowski, thank you so much! But what is the purpose of the power measurement here in wireless communication?

[@drwagner14]

For one, wireless communication power must conform to regulatory limits.

[@hadidahlan9695]

For channel power measurement with Integrated Bandwidth method, would the RBW setting impact the resulting channel power?

[@pauldenisowski]

That's a great question. Generally speaking, you should use a RBW that is a couple of orders of magnitude smaller than the channel width. For example, for a 20 MHz wide LTE channel you would want a RBW around 100 kHz and for a 5 MHz wide WCDMA channel a RBW of about 30 kHz would be appropriate. Using a narrower RBW (slightly) increases measurement time but improves accuracy, especially if the power is not uniform (flat) across the channel. A narrower RBW will also minimize inaccuracy at the edges of the channel caused by the shape of the RBW filter. A spectrum analyzer with a channel power measurement function (like all R&S spec ans) should automatically choose an appropriate RBW based on the channel width, so in most cases you shouldn't need to worry about manually selecting a RBW. Thanks again for the great question!

[@mchama95]

Hello, thank you for the video. How do I calculate Integrated Bandwith (IBW) power by getting the trace from the Spectrum Analyzer? Let's say I have a 20MHz BW carrier setup at 1GHz. I get the x and y axis trace from the instrument, how do I calculate the IBW power from that imported trace using for e.g MATLAB or Python?

[@drwagner14]

Most spectrum analyzers preform this as a built-in function. Check your manual.

[@ShriramVEVO]

Hi, Can you provide like for ACLR presentation please.

[@pauldenisowski]

It's coming! But I probably won't be back on spec an topics for a few months :)

[@muhammadrifqisabari7465]

During measure channel power using Integrated Bandwidth, shall I use trace Average or Max Hold for better calculation?

[@pauldenisowski]

The general rule of thumb is to use an RMS detector any time that you are measuring power with a spectrum analyzer. There's no reason you can't use average, max or min hold, etc. but RMS is what I would recommend. This would apply if you were measuring power in zero span mode as well.