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This a framework to test new ideas in transmission technology. Actual development is a LDPC-coder in

rrc
===


 This is a pulse-shaper, using a root-raised cosine with roll-off factor
0.22. At the same time it converts the complex-signal to a real signal
and upsamples by a factor of 2. So one complex signal is converted into
4 samples.
 The main application is to prepare the signal for the STM-cards which
take a real, pass-band signal.


rrc_rcv
-------

 Does the inverse of the rrc_send, that is, applies the rrc, and downsamples
by a factor of 2.

Inputs:
	SAMPLE_S12

outputs:
	SYMBOL_COMPLEX

Config:
	delay<int>: 0
		How many samples delayed


Stats:
	modulo<int>:
		How many samples we missed


rrc
---

short makes the root-raised-cosine with roll-off 0.22

Is more or less a copy-paste from the ancient software-radio.
Highly-optimized convolution and upsampling of 4 in one.

Inputs:
	SYMBOL_COMPLEX

outputs:
	SAMPLE_S12