CDMA in GNURadio

GNU Radio
1

Hi All,

Does anyone experiment with CDMA via GNU Radio? I am trying to implement
CDMA via GNURadio. How and where should I start? Thanks in advance.

-Brook

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2

On Mon, Oct 26, 2009 at 5:00 PM, Brook L. [email protected] wrote:

Hi All,

Does anyone experiment with CDMA via GNU Radio? I am trying to implement
CDMA via GNURadio. How and where should I start? Thanks in advance.

Synchronization is probably a good place to start.

Once you have synchronization, it should all just fall into place.

Brian

3

Thanks for your reply, Brian. Is there any examples that I can
reference?

Thanks,
Brook

Brian P. wrote:

Once you have synchronization, it should all just fall into place.

Brian

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4

On Mon, Oct 26, 2009 at 6:31 PM, Brook L. [email protected] 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

5

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 P. wrote:

CDMA: Principles of Spread Spectrum Communication # ISBN-13:

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6

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 L. [email protected]

7

Brian P. wrote:

On Mon, Oct 26, 2009 at 6:31 PM, Brook L. [email protected] 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

I would recommend also:

An experimental approach to CDMA and interference mitigation - Luca
Fanucci,Filippo Giannetti,Marco Luise,Massimo Rovini

It describes whole design and implementation process of digital CDMA
receiver, there is a plenty of practical, helpful information.