How to create input of linear equalization channel?

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Hello ,
i want to create the input channel to linear equalizer . The project is asking to create random complex channel h ,4-QAM modulation and then find the output y.My code is:
for i=1:K+1
N=100 %symbols
a = repmat(-1:2:1,1,2)-[repmat(-1j,1,2) repmat(1j,1,2)];
Ak = a(randi(4,N,1)); % 4-QAM sequence of 100 samples
Is this the right way?because i am a little bit confused.
Thank you.

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