Thank you for the fast respond, But, when I use PSK Mod then PSK Demod the output different from the input so no output from the Packet Decoder. Any suggestion?
On Tue, Jun 23, 2015 at 9:17 PM, Nowlan, Sean <sean.now...@gtri.gatech.edu> wrote: > Introducing ISI to a PSK signal with a root-raised cosine (RRC) filter > is a standard communications technique. At the receiver, use a matched RRC > filter to eliminate the intentional ISI introduced at the transmitter. This > works because the combined filter response of the two filters is a raised > cosine pulse, which satisfies the Nyquist criterion for zero ISI. > > > > In the PSK Mod block, the filter construction is not exposed to the user > except through the excess bandwidth or roll-off parameter. You could adjust > that bandwidth factor to be close to zero, but this will create a very long > filter. If you really want to do what you are saying, it would be worth > looking at the source code for the PSK Mod block, and taking the filter > out. However, it is likely that you don’t really want to do this. > > > > Sean > > > > *From:* discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org > [mailto:discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org] *On > Behalf Of *Surya Agam > *Sent:* Tuesday, June 23, 2015 9:47 AM > *To:* GNURadio Discussion List > *Subject:* [Discuss-gnuradio] PSK Mod Block > > > > Hello, > > > > I wanna use PSK Mod Block, but the ISI is annoying. Why PSK Mod Block have > a it's own ISI? > > And also is there anyway to disable the ISI from the block? > > > > -- > > Sincerely, > > > > Surya Agam > > University Al Azhar of Indonesia, Jakarta > -- Sincerely, Surya Agam University Al Azhar of Indonesia, Jakarta
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