Re: [Discuss-gnuradio] CPFSK mod/demod + strange behavior

[Achilleas Anastasopoulos]

Marcus,

any PAM signal with symbol rate R can be transmitted using bandwidth R/2

(essentially a sinc pulse; this is the case when you put 0 as the roll-off factor of an RRC).

I thought your comment was not specifically for CPFSK, 

but general transmission schemes thus my clarification. 

If it is specific for CPFSK then kindly disregard the above.

Achilleas

> So, I will need you to *explain* how you can transport 1.somethingMb/s
> through a 625kHz wide channel if every time you use that channel to
> transmit a symbol, only one bit can get sent. How do these numbers add
> up for you? You've got a serious problem with your pulse shaping, there.

On Thu, Jun 9, 2016 at 3:04 PM, Achilleas Anastasopoulos <address@hidden> wrote:

Why are you using the RRC filters?

I hope you are realizing that filtering a CPFSK signal is not the same as filtering its instantaneous frequency (which is a PAM signal with rectangular pulses).

As a result, the next question is why in your poly-phase filter you are using RRC filter taps?

Achilleas