Can You Double the Data Rate by Doubling Transmit Power?

Iain Explains Signals, Systems, and Digital Comms

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Explains that if you double the transmit power, and also double the number of bits sent per unit time, then the modulated transmit symbols will be more prone to errors from noise, since they are closer together in the constellation diagram.
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Опубликовано:

29 сен 2024

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Комментарии : 18

@Oshea321 3 месяца назад

can you do a video on communication codes like turbo codes bcjr ldpc decoding visualized thanks

@eswnl1 6 месяцев назад

Just out of curiosity, I wondered what would happen if I quadrupled the power. After redoing the calculation, I get 0.9A. Not quite 1A.

@iain_explains 6 месяцев назад

Yes, it's practical examples like this that really give insights into the fact that the capacity formula involves a log function.

@shantharma5510 5 месяцев назад

Hi Professor , can you do a topic on Spectral Correction and FFT Limitations , which involves WINDOWING functions? would be much appreciated . Thank you ;}

@iain_explains 5 месяцев назад

Thanks for the topic suggestion. I've put it on my "to do" list.

@scienteer3562 6 месяцев назад

You can, so long as Data Rate

@ahmedbendary6917 6 месяцев назад

This is clear at low SNR where the log function is almost linear.

@MykytaSpirin 6 месяцев назад

What will happen if we will keep modulation scheme same but will increase the symbol rate?

@iain_explains 6 месяцев назад

Then the bandwidth will increase. See: "How are Data Rate and Bandwidth Related?" ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZBSvMbO0mPQ.html

@lucidasser7153 6 месяцев назад

Thanks, in the IQ plane, there is no real unit (U or E or H) - is that right?

@iain_explains 6 месяцев назад

What do you mean "real unit"? The axes are the signal voltage levels (scaled to a unit resistor - ie. Power=V^2/R where R=1ohm).

@lucidasser7153 6 месяцев назад

@@iain_explains yes this is the answer - it was not mentioned in the video...thanks

@egearslan8127 6 месяцев назад

Thanks for the video. I understood it for QAM. I wanted to ask why this also true for multi dimensional modulation schemes. Thanks in advance

@iain_explains 6 месяцев назад

I assume you mean orthogonal modulation schemes (eg. FSK)? In those cases, to increase the data rate you need to add new dimensions (eg. new frequencies). That means you're increasing the bandwidth. Increasing the power just reduces the BER. (Of course, there are things that can be done to adjust the end-to-end data rate using coding, but I'm trying to emphasise the physical layer here.)

@lasertv3598 6 месяцев назад

Another great video. I get to learn and it keeps my knowledge from fading away.

@iain_explains 6 месяцев назад

Glad to hear it!