If I cancel my parental rights, can I waive child support too?

My ex-wife always makes problem on my kid’s visitation schedule and she did emergency order of protection twice with no reasons in the past and had been dismissed all. Now, I'm under order of protection just because I came to my kid’s school to see and check them in spite of I'm up to date in child support. I'm done and nobody can stop her, either the law and the police always believe her despite she acts that she is under oppression. By the way, my ex-wife receives food stamps and medical because she is very greedy and she likes to have all government assistance.