Dear Maheswari,

There are a lot of Autonomous colleges in AP offering M.Tech. in ECE related fields.

To list a few:

G.Pulla Reddy Engineering College offers M.Tech programs in Communications and Signal processing as well as VLSI and Embedded systems

SRKR Engineering College provides M.Tech (Communication Systems)

KSRM College of Engineering offers M.Tech (Communications and Signal Processing)

RVRJC offers M.Tech (Communications and Signal Processing) 

Raghu Engineering college has M.Tech in Power Electronics

Hope this helps.All the best!