Re: [Discuss-gnuradio] CPM timing recovery

2007-06-05 Thread Robert McGwier
Since the signal will not really have infinite bandwidth (instantaneous transitions from one state to the next), the envelope will not be of constant modulus. The signal will be amplitude modulated with a component due to the data transitions. Looking at the modulus or modulus squared will r

Re: [Discuss-gnuradio] DAB, RDS, DRM, HDradio and OFDM

2007-06-05 Thread Eric A. Cottrell
Martin Dvh wrote: > Hi all, > Is anybody working on DAB, RDS,DRM, HDradio or OFDM at the moment. > I will probably be working on all of these in the near future and was > wondering what the status is of these and where to find what. Hello, I have some interest in IBOC. iBiquity has some informat

Re: [Discuss-gnuradio] CPM timing recovery

2007-06-05 Thread Achilleas Anastasopoulos
David, one way to estimate the rate is to raise the CPM signal to an appropriate power in order to generate spectral lines that can be easily tracked. The precise power is a function of the modulation index of your CPM modulation. Eg, if you are using full-response CPFSK with h=N/D (where N,D

Re: [Discuss-gnuradio] compile error

2007-06-05 Thread Johnathan Corgan
Dawei Shen wrote: > I just did a svn update (revision 5694) and met the following > compilation error: > > make[5]: Entering directory > `/home/dshen/GNURadio/gnuradio/gnuradio-core/src/lib/swig' > make[5]: *** No rule to make target > `../../../../gnuradio-core/src/lib/general/gr_dpll_ff.i', nee

[Discuss-gnuradio] compile error

2007-06-05 Thread Dawei Shen
Hey Guys, I just did a svn update (revision 5694) and met the following compilation error: make[5]: Entering directory `/home/dshen/GNURadio/gnuradio/gnuradio-core/src/lib/swig' make[5]: *** No rule to make target `../../../../gnuradio-core/src/lib/general/gr_dpll_ff.i', needed by `gnuradio_swig

[Discuss-gnuradio] CPM timing recovery

2007-06-05 Thread David Scaperoth
hey all, I am trying to demodulate a CPM (for now I'm doing it with 4-CPFSK signal with Raised Cosine pusle shaping) signal without knowing the symbol rate ( i.e. the samples per symbol). does anyone know if this is possible? Papers that I have read on timing recovery for CPM assume that the sy