Hello aspirant!  Let me to inform you that according to the previous years cut off and closing rank for government colleges through pgecet exam you do have a Chance to get some government colleges. Under electronics and communication engineering branch you can get systems and signal processing as specialization. 

As per your query I would like to tell you that according to your rank and based upon the previous year cuttoff marks you have mostly chances of getting admission in (B) category collage such as velagapudi ramakrishna siddharta engineering collage, vijaywada and Annamacharya insitute of technology and science, lakireddy bali reddy collage of engineering, krishna. 

Only those candidates who getting rank 500-1000 admission in those government engineering collage. 

Hopefully it's will be useful to you.  Hopefully you are getting what ever has been told so, good luck!