As per your request, I am giving you list of courses which you cab opt after doing the B.Tech in electronics and communication course.

Higher studies courses:

M. Tech. Automotive Electronics (in collaboration with TIFAC-CORE industry partners)
M. Tech. Communication Engineering
M. Tech. Nanotechnology
M. Tech. Sensor System Technology
M. Tech. VLSI Design

Short term Courses:

Advanced Diploma in Real Time Operating Systems (6 months)
Diploma in Embedded Systems Design-DESD (24 weeks)
Advanced Diploma in Embedded System (4 months)
Advanced Certificate Course in Embedded System Design
PG Diploma in Embedded System Design (20 weeks)
Advanced Diploma in Real-time and Embedded Systems (4 months)
Advance Diploma in Embedded System Design
Certificate course in Embedded Systems (5 months)
Diploma in Embedded microcontrollers and processors (3 months)
Certificate courses in Real Time Operating System
Microcontrollers and Embedded C (1 month)
Certificate Course in Embedded Systems Design (6 months)
Certificate Course in Advanced Embedded Systems Design

Here, I am giving you list of the institutes for the M.Tech courses in India.

Indian Institute of Technology - Bombay (IIT Bombay )
Mumbai, Maharashtra

Indian Institute of Technology - Delhi (IIT Delhi)
Delhi, Delhi NCR

Indian Institute of Technology - Kharagpur (IIT Kharagpur)
West Bengal

Indian School of Mines - Dhanbad (ISM Dhanbad)

Dhanbad, Jharkhand

Indian Institute of Technology - Roorkee (IIT Roorkee)
Roorkee, Uttarakhand

Institute of Technology - Banaras Hindu University ( IT-BHU)
Varanasi, Uttar Pradesh

Indian Institute of Technology - Kanpur (IIT Kanpur)
Kanpur, Uttar Pradesh