In this thesis, we investigate the independent but not identically distributed
(i.n.i.d.) situations for spectrum sensing and data transmission. In particular, we
derive the false-alarm probability and the detection probability of cooperative spectrum sensing with the scheme of energy fusion over i.n.i.d. Nakagami fading channels.
Then, the performance of adaptive modulation with single-cell multiuser scheduling
over i.n.i.d. Nakagami fading channels is analyzed. Closed-form expressions are derived for the average channel capacity, spectral efficiency, and bit-error-rate (BER)
for both constant-power variable-rate and variable-power variable-rate uncoded M-
ary quadrature amplitude modulation (M-QAM) schemes. In addition, we study the
impact of time delay on the average BER of adaptive M-QAM. From the selected numerical results, we can see that cooperative spectrum sensing and multiuser diversity
brings considerably better performance even over i.n.i.d. fading environments.
|Date of Award||Jul 2011|
|Original language||English (US)|
- Computer, Electrical and Mathematical Science and Engineering
|Supervisor||Mohamed-Slim Alouini (Supervisor)|