Hi,

Some of the top core companies of electronics and communication are :

Networking electronics: Broadcom, Qualcom, Alcatel Lucent, Cisco, Ericcson,    Siemens, sify, Cavium, sandvine,saankhya labs
Telecom: Bharti Airtel, Idea cellular, reliance jio, vodafone.
Semiconductor: Broadcom, Qualcom, Intel, Texas, AMD, Samsung, Cadence, Analog devices,Redpine, Xilinx, NVidea,smartplay, Synopsys

Consumer electronics: Philips, honeywell, bosch, khaitan.

As you are a fresher: You can try some of small companies like startups, medium scale companies.