Electrical Engineering and Communication Engineering are two different programs. If you really like 无线通信和计算机通信, kind of high hierarchy stuff, go take Communication Engineering.But if you want to know how to implement 无线通信和计算机通信, EE is your choice.
Your supervisor is right. For the first year even second year student, there is no much difference whether you are in EE or CE. Read the course description carefully and then make your choice in your third and final year studying.For the studying, in my opinion, if, and only if, it's your choice, your interest, prof. won't be a big reason for you to take course. Nothing is easy to pass if you are not interested in it and work hard on it. What it sounds like?