Title :
Adaptive modulation with best user selection over non-identical Nakagami fading channels
Author :
Rao, Anlei ; Alouini, Mohamed-Slim
Author_Institution :
King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia
Abstract :
In this paper, we analyze the performance of adaptive modulation with single-cell multiuser scheduling over independent but not identical distributed (i.n.i.d.) Nakagami fading channels. 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. We also study the impact of time delay on the average BER of adaptive M-QAM. Selected numerical results show that the multiuser diversity brings a considerably better performance even over i.n.i.d. fading environments.
Keywords :
Nakagami channels; adaptive modulation; channel capacity; error statistics; quadrature amplitude modulation; BER; M-QAM schemes; adaptive modulation; average channel capacity; best user selection; bit-error-rate; closed-form expressions; constant-power variable-rate; multiuser diversity; nonidentical Nakagami fading channels; single-cell multiuser scheduling; spectral efficiency; variable-power variable-rate uncoded M-ary quadrature amplitude modulation; Bit error rate; Channel capacity; Delay effects; Fading; Manganese; Nakagami distribution; Signal to noise ratio;
Conference_Titel :
Wireless Communication Systems (ISWCS), 2011 8th International Symposium on
Conference_Location :
Aachen
Print_ISBN :
978-1-61284-403-9
Electronic_ISBN :
2154-0217
DOI :
10.1109/ISWCS.2011.6125427