here I am giving you name of some short term courses that you will provides you better career opportunities after passing Electronics and Communication engineering below:

Short term courses :
Embedded Systems Short-term courses after B.Tech ECE
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
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
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)

Short-term courses in Industrial Automation after B.Tech ECE
A course on Electrical & Electronics for Automation (1 week)
Certificate course in Industrial and Control Engineering
PG Diploma course in Industrial Automation System Design (6 months)
Advanced Diploma course in industrial Automation and System Design (18 weeks)
Automotive Electronics (50 weeks)

Short-term courses in Digital Signal Processing after B.Tech ECE
Boot Camp Training Program (DSP Concepts)
Diploma in DSP (6 months)
Applied Digital Signal Processing (50 weeks)
Certificate courses in Analog Devices and Texas Instruments DSPs (1 month)
Digital Signal Processor and Applications, (Part time-6 Weeks/Full time-2 Weeks)
Diploma in DSP Applications, (Part time-3 months/Full time-6 months)
Certificate Course in Digital Signal Processing (6 Months)

Short-term courses in VLSI Design after B.Tech ECE
Advanced Certificate Course in VLSI Design
Advanced Post-Graduate Diploma in VLSI Design (6 months)
Post Graduate Diploma in VLSI Design (4 months)
VLSI System Design (50 weeks)
Certificate courses in Verilog and VHDL (1 month)
Certificate program in VLSI design engineering (Physical Design or Logic Design)
Diploma in VLSI Design (6 months)

Short-term courses in Telecom and Wireless after B.Tech ECE
Post Graduate Diploma in Wireless and Mobile Computing (24 weeks)
Advance Diploma in Wireless Technology
Wireless and Mobile communications (50 weeks)
Advanced Wireless Communications (3 months)