CDMA support in GNU Radio

GNU Radio
1

Hi everyone!

I just wondered if anyone else has experimented with CDMA in GNU
Radio? I tried searching through the code, but could not find
anything. My plan is to create a custom despreading code block, and
just multiply this with the received signal. The BW of the spread
signal is 2 MHz, so that should be within the limitations of GNU Radio
and USRP. Any objections to this approach, or hints on what I should
do different?

Thanks for reading this,

Trond D.

2

Trond D. wrote:

The BW of the spread
signal is 2 MHz, so that should be within the limitations of GNU Radio
and USRP.

AFAIK channel BW is 1.25MHz for the cdma2000 family, and closer to 4MHz
for W-CDMA. Which standard are you thinking of working with?

3

2007/1/16, Chris K. [email protected]:

Trond D. wrote:

The BW of the spread
signal is 2 MHz, so that should be within the limitations of GNU Radio
and USRP.

AFAIK channel BW is 1.25MHz for the cdma2000 family, and closer to 4MHz
for W-CDMA. Which standard are you thinking of working with?

I am creating a GPS receiver, therefore the interest in CDMA.

–
Trond D.

4

Trond D. wrote in post #190184:

Hi everyone!

I just wondered if anyone else has experimented with CDMA in GNU
Radio? I tried searching through the code, but could not find
anything. My plan is to create a custom despreading code block, and
just multiply this with the received signal. The BW of the spread
signal is 2 MHz, so that should be within the limitations of GNU Radio
and USRP. Any objections to this approach, or hints on what I should
do different?

Thanks for reading this,

Trond D.

hi Trond D.
i would like to experiment with mc-cdma in GNU Radio,do u have any
experience,thank you !

5

hi Trond D.
i would like to experiment with mc-cdma in GNU Radio,do u have any
experience,thank you !

Hi plz can you share some ideas of mc cdma in gnuradio with me.
waiting for you reply

6

usama s. wrote in post #1032828:

hi Trond D.
i would like to experiment with mc-cdma in GNU Radio,do u have any
experience,thank you !

Hi plz can you share some ideas of mc cdma in gnuradio with me.
waiting for you reply

Hi usama_s. i think DSSS maybe a good choice.The most difficult point is
synchronism. i am learning how to implement,we can communicate with each
other

7

xiao xiao wrote in post #1033794:

usama s. wrote in post #1032828:

hi Trond D.
i would like to experiment with mc-cdma in GNU Radio,do u have any
experience,thank you !

Hi plz can you share some ideas of mc cdma in gnuradio with me.
waiting for you reply

Hi usama_s. i think DSSS maybe a good choice.The most difficult point is
synchronism. i am learning how to implement,we can communicate with each
other

Dear xiao xiao . Are you spreading with any built-in block or you are
making new (Your own) . i am confuse with spreading the signal how to
spread each bit with 8 or 16 bit.

Thank you