Joint multiuser switched diversity and adaptive modulation schemes for spectrum sharing systems
Type
Conference PaperAuthors
Qaraqe, MarwaAbdallah, Mohamed M.
Serpedin, Erchin
Alouini, Mohamed-Slim

Alnuweiri, Hussein M.
KAUST Department
Electrical Engineering ProgramComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Communication Theory Lab
Date
2012-12Permanent link to this record
http://hdl.handle.net/10754/564640
Metadata
Show full item recordAbstract
In this paper, we develop multiuser access schemes for spectrum sharing systems whereby secondary users are allowed to share the spectrum with primary users under the condition that the interference observed at the primary receiver is below a predetermined threshold. In particular, we devise two schemes for selecting a user among those that satisfy the interference constraint and achieve an acceptable signal-to-noise ratio level. The first scheme selects the user that reports the best channel quality. In order to alleviate the high feedback load associated with the first scheme, we develop a second scheme based on the concept of switched diversity where the base station scans the users in a sequential manner until an acceptable user is found. In addition to these two selection schemes, we consider two power adaptive settings at the secondary users based on the amount of interference available at the secondary transmitter. In the On/Off power setting, users are allowed to transmit based on whether the interference constraint is met or not, while in the full power adaptive setting, the users are allowed to vary their transmission power to satisfy the interference constraint. Finally, we present numerical results for our proposed algorithms where we show the trade-off between the average spectral efficiency and average feedback load for both schemes. © 2012 IEEE.Citation
Qaraqe, M., Abdallah, M., Serpedin, E., Alouini, M.-S., & Alnuweiri, H. (2012). Joint multiuser switched diversity and adaptive modulation schemes for spectrum sharing systems. 2012 IEEE Global Communications Conference (GLOBECOM). doi:10.1109/glocom.2012.6503278Conference/Event name
2012 IEEE Global Communications Conference, GLOBECOM 2012ISBN
9781467309219ae974a485f413a2113503eed53cd6c53
10.1109/GLOCOM.2012.6503278