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 |
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| Original language | English (US) |
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| Awarding Institution | - Computer, Electrical and Mathematical Sciences and Engineering
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| Supervisor | Mohamed-Slim Alouini (Supervisor) |
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