Re: [Discuss-gnuradio] root_raised_cosine principle

2014-09-03 Thread Tom Rondeau
On Mon, Sep 1, 2014 at 11:50 AM, Martin Braun wrote: > Please stick to the list. > > On 09/01/2014 05:35 PM, adream wrote: > > Thanks for your reply > > May be I should make my question more specifically, > > > > den = -32 * M_PI * alpha * alpha * xindx/spb; > > > > I can't understand well why th

Re: [Discuss-gnuradio] root_raised_cosine principle

2014-09-01 Thread Martin Braun
Please stick to the list. On 09/01/2014 05:35 PM, adream wrote: > Thanks for your reply > May be I should make my question more specifically, > > den = -32 * M_PI * alpha * alpha * xindx/spb; > > I can't understand well why there is "-32" That I don't know. Of course, it's just a gain change, s

Re: [Discuss-gnuradio] root_raised_cosine principle

2014-09-01 Thread Martin Braun
On 09/01/2014 05:01 PM, adream wrote: > Hi, >I get the source code of root_raised_cosine function in gr_firdes.cc, > but I can't understand why it writes in that way, is there any paper can > give me more details about the principle of root_raised_cosine Any standard textbook on digital commun

[Discuss-gnuradio] root_raised_cosine principle

2014-09-01 Thread adream
Hi, I get the source code of root_raised_cosine function in gr_firdes.cc, but I can't understand why it writes in that way, is there any paper can give me more details about the principle of root_raised_cosine Thank you this is the source code of root_raised_cosine vector gr_firdes::root_raised