Title :
Adaptive Modulation Algorithms based on Finite State Modeling in Wireless OFDMA Systems
Author :
Marabissi, Dania ; Tarchi, Daniele ; Fantacci, Romano ; Genovese, Federico
Author_Institution :
Univ. of Florence, Florence
Abstract :
WiMAX is considered one of the most prominent technologies for providing a Broadband Wireless Access (BWA) in a metropolitan area. Among several strategies, the adaptive modulation techniques has been selected for providing an efficient non line of sight (NLOS) coverage. Adaptive modulation allows the system to adapt the modulation scheme according to the channel conditions in order to enhance the system performance. This paper deals with the proposal of a state model to be used for the performance comparison of two different adaptation algorithms based on the maximization of different functional costs suitable for use in WiMAX system with an OFDMA physical structure. The performance of the algorithms has been derived and compared in terms of error rate and throughput. The algorithms show a significant improvement in the system performance compared with the static case, i.e., no adaptive modulation; in particular each algorithm is suitable for satisfying different QoS requirements.
Keywords :
OFDM modulation; WiMax; adaptive modulation; broadband networks; error statistics; multi-access systems; quality of service; radio access networks; wireless channels; NLOS coverage; QoS metric; WiMAX; adaptive modulation algorithms; broadband wireless access; channel conditions; error probability; finite state modeling; metropolitan area network; wireless OFDMA systems; Data communication; Error probability; Land mobile radio; Media Access Protocol; Narrowband; OFDM; System performance; Throughput; WiMAX; Wireless communication;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2007. PIMRC 2007. IEEE 18th International Symposium on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-1144-3
Electronic_ISBN :
978-1-4244-1144-3
DOI :
10.1109/PIMRC.2007.4394591
