Author
Edemen, Çağatay, Kaya, O.
Publication Date
2014-11
Publication Place
-
IEEE
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1089-7798
Record ID
512da6fa-f2b6-4cf4-ab87-89d0b4363fcb
Library Location
Electrical & Electronics Engineering
Date
2014-11
Notes
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text
We consider a three-user fading cognitive cooperative multiple access channel (MAC) with one primary and two secondary transmitters. We propose two encoding/decoding strategies with varying levels of cooperation, based on block Markov superposition encoding and backward decoding. The first is an overlay model, where the secondary users (SUs) aid the transmission of the primary user (PU) by causally decoding the PU message and forwarding it while also cooperating among each other. The second is an underlay model, where the SUs cooperate by decoding and forwarding each other's messages while treating the signal received from the PU as noise. In either case, the PU is guaranteed to operate at its maximum achievable single user rate. We characterize the achievable SU rate region for both models and maximize this region as a function of the transmit powers. The simulation results show that the SU rate region can be significantly enlarged, particularly using the overlay model.
DOI
10.1109/LCOMM.2014.2360519
Cilt
18
