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Home | Research | M.Sc. And Ph.D Thesis | Interference-Minimizing Code Assignment for Cognitive Underlay CDMA Systems

Interference-Minimizing Code Assignment for Cognitive Underlay CDMA Systems

Thesis Title: 
Interference-Minimizing Code Assignment for Cognitive Underlay CDMA Systems
Name: 
Mohamed Tawfeek Kashef Hany
Date of Birth: 
Sat, 01/09/1984
Nationality: 
Egyptian
E-mail: 
Degree: 
Master
Previous Degrees: 
B.Sc. (ELC) 2006 - Cairo
Registration Date: 
Sun, 01/10/2006
Awarding Date: 
Tue, 14/07/2009
External Supervisors: 

Dr. El-Ezabi, A. Y.

Examiners: 

Dr. Sourour, E. A.
Dr. Nafie, M. H.
Dr. Khairy, M. M.

Key Words: 

CDMA, Underlay, Cognitive radio, Code assignment, IMCA

Summary: 

In this thesis we propose a code-division multiple-access (CDMA) secondary
network to operate cognitively as an underlay for a primary network. A novel
interference-minimizing code assignment (IMCA) for secondary users is
proposed such that the interference from existing primary and secondary users is
minimized. We propose a method for blind epoch acquisition by processing the
covariance matrix of the received signal. Also, we propose a framework for
designing an underlay secondary CDMA network. We propose a slightly
modified minimum-output energy receiver that operates semi-blindly.