GRE - 1500||ToEFL - 115||CGPA - 8.1||Work Experience - 22 months||Domain:IP consultin

B.Tech - 8.1 , Elec Engg. IIT Kanpur
10th and 12th - 95%
GRE - 1500
Recommendations - 2 electrical profs, 1 from company COO.
1 paper(was submitted in 2009 but did not follow up after that)
TOEFL - 115
Work exp - 2 years in Intellectual property consulting
Btech - Optical Character Recognition

MS in Communication/ Signal Processing

I had got an admit in the year 2010 from NCSU, but did not take it up.
What universities should I apply? Is there any chance of getting aid for MS in Mobile/Wireless Communication/ Signal Processing?

Chances:
TAMU
NCSU
GaTech
Purdue
UCSB
UCSD
UC Irvine
UTA
USC

Hi
You have a strong profile. GRE is stupendous. Acads are also a strong point. IIT tag will boost up your profile a lot.
Considering your list:
TAMU - amb. (gettable)
NCSU - moderate
GaTech - moderate
Purdue - upper moderate
UCSB - upper moderate
UCSD - lower moderate
UC Irvine - safe
UTA - very amb.
USC - safe
A good balanced list. You can proceed with it. UIUC is another ambitious university you may apply to (preference to IITians).
Regards