You cannot modify the step method of comm.LTEMIMOChannel. But you can do what you need by creating a very simple System object that inherits from comm.LTEMIMOChannel. For example:
classdef MYLTEMIMOChannel < comm.LTEMIMOChannel
methods(Access = protected)
function varargout = stepImpl(obj, x, varargin)
if obj.PathGainsOutputPort
[y, g] = stepImpl@comm.LTEMIMOChannel(obj, x, varargin);
varargout = {y, g};
else
varargout = {stepImpl@comm.LTEMIMOChannel(obj, x, varargin)};
end
% Put your decimation code here
end
end
end
The MYLTEMIMOChannel and comm.LTEMIMOChannel should behave the same. After you fill in your decimation code, you can replace comm.LTEMIMOChannel by MYLTEMIMOChannel in your code and call the step method to have the filter output decimated.
