Re: [Discuss-gnuradio] CDMA in GNURadio

[Lin HUANG]

It is possible I think. The current synchronization method only uses the inserted preambles. If you don't change the preamble, it will not affect the synchronization.

 

You may add a Code block into the transmitter diagram, also you need to change some parameters of other blocks. But for the receiver side, it is not as easy as the TX side. Because for the receiver path:

ofdm receive --> ofdm demod

only two blocks. You have to go deep into them and modify them.

 

Lin

 

2009/11/21 Brook Lin <address@hidden>

Hi  Brian and All,

Thanks for your last reply about implementing CDMA in GNURadio. I read some
materials on synchronization and also the OFDM examples in GNURadio. Is that
possible if I add a Code block into the OFDM block diagram to implement
MC-CDMA?

For the OFDM Transmit path:
frame source -> symbol modulation -> insert preambles -> IFFT -> add cyclic
prefix -> scale -> USRP

Can I add a code block into this path to get MC-CDMA, like
frame source -> symbol modulation -> code -> insert preambles -> IFFT -> add
cyclic prefix -> scale -> USRP

Is this possible for implementing the MC-CDMA. Can I apply the same
synchronization method for OFDM into MC-CMDA? Please advise me.

Thanks,
Brook


Brian Padalino wrote:
>

> On Mon, Oct 26, 2009 at 6:31 PM, Brook Lin <address@hidden> wrote:
>>
>> Thanks for your reply, Brian. Is there any examples that I can reference?
>
> Though I have never read any of the books, these seem to have a lot of
> good information:
>
>   Spread Spectrum and CDMA: Principles and Applications # ISBN-13:
> 978-0470091784
>   CDMA: Principles of Spread Spectrum Communication # ISBN-13:
> 978-0201633740
>
> They both have sections on synchronization, and other details you will
> encounter in a CDMA system.
>
> Good luck!
>
> Brian
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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>

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