How to concatenate output of two train model and do Overhead Classification?

I have eye-dagram dataset of [BPSK,QPSK,8PSK,2PSK]. one model trained on just I sample and one is trained on Q sample. I have attached the I-sample image for understanding. When i train the model on eye-diagram (Attached image) the accuracy are not good but when i train on only I-sample the accuracy are very good. Then i have train two separate model on I-sample and Q-sample.

Now i want to concatinate for overhead classification.

please assist

net1 = trainNetwork(auimdsTrain,lgraph,options); % train on I-sample
net2 = trainNetwork(auimdsTrain,lgraph,options); % train on Q-sample