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I've been getting this error message when trying to simulate the <ofdm_txrx_mimo> model in Simulink:
Failed to find library 'commchan3' referenced by 'ofdm_txrx_mimo/"Channel"/AWGN Channel'. This library must be on your MATLAB path.
I can't locate such a library to add it to my Matlab path. I am using SVN revision 821. I already successfully simulated this model about a week ago, but can't remember what revision of the model I used. Thanks.
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Okay, so I found the answer to my question in other posts. I do not have the Comm of Filter blocksets (or any additional blocksets), so I removed all the "Bad Link" blocks from the model that required these libraries. I guess my time-limited trial blocksets that I had when I first successfully simulated the model have expired. But now I get the following error message when trying to simulate:
Error evaluating 'InitFcn' callback of block_diagram 'ofdm_txrx_mimo'. Undefined function or method 'firpm' for input arguments of type 'double'.
I cannot find the function 'firpm'. By default, Matlab/Simulink use the data type 'double'. What should I change this to? I am using the <ofdm_txrx_mimo.mdl> model under \ResearchApps\PHY\MIMO_OFDM, SVN version 821.
Also, how does removing blocks from the Simulink model (that are not necessary for hardware, eg. Comm blocks) affect the conversion into an OPB-compliant periheral core? Thanks.
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The firpm function defines the filter coefficients for the decimation filters inside the channel subsystem. These filters are realized using Simulink blocks; in hardware, the actual filters are implemented in the AGC core. You can safely remove this filters in simulation, and let the input gateways in the OFDM receiver decimate the input samples.
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Sorry if this question seems trivial, but I had already removed the 4 decimation filters in the Channel subsystem, along with all the other "Bad Link" blocks. My Channel subsystem looks like this:
4 Antenna Inports -> 2 Real-Imag to Complex -> MIMO "Channel" -> 2 Gain -> 2 Integer Delay -> 2 Complex to Real-Imag -> 4 Ant Outports
I still get the same error message when I try to compile. Thanks for your help.
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The firpm function is called in the init script (ofdm_tx_mimo_init.m) on line 179. It's safe to comment this out (I don't think we use the variable 'lpf_h' anywhere in the current version).
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So I commented out line 179, recompiled, and Simulink gave the same error messages for the "rcosfir" and "interp" functions. I commented these lines out as well (lines 181,183 for rcosfir; 233,234 for interp), and get this error:
Error in 'ofdm_txrx_mimo/OFDM Tx MIMO/Filter & DACs/Polyphase Interpolator': Parameter 'interpFilter_4' cannot be evaluated. MATLAB error message: Undefined function or variable 'interpFilter_4'.
Since the 'interpFilter_4' variable is derived using the "interp" fcn (line 234), and I commented this line out, of course this error will occur. So how do I compile the model w/o any additional blocksets? Thanks.
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Here's the vector of values for interpFilter_4:
interpFilter_4 = [1.060263e-013 -4.559319e-003 -6.777514e-003 -5.177760e-003 -1.989520e-013 2.578440e-002 3.945777e-002 3.118661e-002 -6.612488e-013 -8.770110e-002 -1.426581e-001 -1.220465e-001 2.824407e-013 2.910058e-001 6.098364e-001 8.713054e-001 1.000000e+000 8.713054e-001 6.098364e-001 2.910058e-001 2.824407e-013 -1.220465e-001 -1.426581e-001 -8.770110e-002 -6.612488e-013 3.118661e-002 3.945777e-002 2.578440e-002 -1.989520e-013 -5.177760e-003 -6.777514e-003 -4.559319e-003 1.060263e-013];
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Happy New Year!
Is it possible for you to put up a Reference Design that does NOT require any additional Matlab or Simulink toolboxes/blocksets? I did manage to compile the above model into an OPB core, but when trying to repeat it for the <ofdm_TxRx_mimo> model under the Ref. Design v4 (instead of Research Apps), I get similar error messages for different functions. I noticed that the 2 models are slightly different and so are the <ofdm_tx_mimo_init.m> files (eg. "randint" fcn is used in Ref. Design but not in Research Apps). Instead of replying about every little fcn/block that needs an additional toolbox/blockset, can you please provide a Ref. Design that doesn't require them? Thanks.
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