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From: Georg Piewald on 1 Mar 2010 05:41
Hello,
I'm having some severe problems with a feedback channel in my
model. I figured out that feedback channels don't work with frame-based
signals in Simulink, because they throw an algebraic loop error. So I
use 'unbuffer' before and 'buffer' after the loop, as shown in the picture:

-----
| |
,------|Delay|<----
| | | |
| ----- |
| |
| |
-------- v + ------ | ------
[Nx1] | | [1] --- | | | | | [Nx1]
========>|Unbuffer|------>| |--->| Gain |----+--->|Buffer|=======>
| | + --- | | | |
-------- ------ ------

But now I want to put a Rician fading channel in the feedback path
(instead of the delay). This block however only works with frame based
signals. To-frame and to-sample conversion immediately before and after
the Rician channel doesn't help, I still get the algebraic loop error.
Does anyone have an idea how to solve this?
Thanks, Georg
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