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who knows how to code a digital modulation in vhdl??
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m.zihanul



Joined: 08 Oct 2008
Posts: 9
Post09 Oct 2008 3:23   

digital modulation in vhdl
hi all

i need help on writing some coding about digital modulation in communication sys.

i just want some guidance from expert in here. please help me.

thanks
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mmarco76



Joined: 04 Jan 2008
Posts: 85
Helped: 6
Post09 Oct 2008 14:50   

who knows how to code a digital modulation in vhdl??
No way, it's not so symply thing..
I suggest you to start read some good book about it in order to divide your digital modulation in sub-block. There are also some basis thesis on the net that you can find about this arguments.
Moreover it's better to focus directly on the kind of modulation you've to realize..

Done that you'll have to design each single block and make the datapath pass throught them.

It's also a lot important that you know the datarate in all the parts of the project expecially if in some point you've to mux different kind of signals (example the varius sync that usually are generated internally).

Done that you'll have also to design digital filter in order to shape the spectrum as you need for your modulation and that's another problem..
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m.zihanul



Joined: 08 Oct 2008
Posts: 9
Post10 Oct 2008 2:42   

who knows how to code a digital modulation in vhdl??
thanks for the reply and some tips.
i have find several books on digital communications and sdr. but i dont know which one is the good book. maybe you could give me some suggestions?
thanks
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mmarco76



Joined: 04 Jan 2008
Posts: 85
Helped: 6
Post10 Oct 2008 15:43   

who knows how to code a digital modulation in vhdl??
Imo a well written book usefull to people that at the end have to implement thing and don't bother too much on maths behind is:

"Richard G. Lyons
Understanding Digital Signal Processing
Prentice Halls"

That's very nice expecially about the filters part (and tricks about them and DFT).

For the modulation I've found all I need on the net in the specifications of the standards (a good starting point in order to find the documentation is the simple wikipedia or googling Smile)
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