[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] Spread Specturm implementation in FPGA
From: |
Firas A. |
Subject: |
Re: [Discuss-gnuradio] Spread Specturm implementation in FPGA |
Date: |
Sat, 10 Jan 2009 21:02:23 -0800 (PST) |
Hi,
> Yong J. Chang" wrote:
> Hi All,
>
> I've worked on Embedded system and FPGA systems for several years and I
> joined the team working on GNU Radio > project. Because of my lack of
> knowledge about digital communication, I need some help of you all.
>
> The goal is simple PAM modulated communication with M-sequence spreading.
> So far as I know, this can be done in
> host PC level. However, our goal is that this is implemented in FPGA level
> in real-time because we have to determine > exact time of packet arriving.
>
> The question is following.
>
> If I implement the despreader ( is it called synchronizer? including
> detecting and tracking ) in FPGA, should I perform
> symbol timing recovery in host PC again? If we use the despreader and can
> detect the peak of correlation between
> received signal and spreading code, I don't think that I have to recover
> symbol timing again because the despreaded
> signal is already symbol-spaced signal captured at nice time. But I'm not
> sure that I'm right or wrong.
>
> And I hope that this can be done in Cyclone FPGA!!!!
>
> Thank you all!
>
> Y. J. Chang
I'm not sure how it is possible to do the spreading with PAM, but I think
doing spreading with PWM is much easier. Also to conserve space in USRP
FPGA, you have to use the image with 1 RX and 1 TX. This will free about 55%
of FPGA resources.
Best Regards,
Firas
--
View this message in context:
http://www.nabble.com/Spread-Specturm-implementation-in-FPGA-tp21380279p21396189.html
Sent from the GnuRadio mailing list archive at Nabble.com.
- Re: [Discuss-gnuradio] Spread Specturm implementation in FPGA,
Firas A. <=