Performance Evaluation of Admission Control and Adaptive Modulation in OFDMA WiMax Systems
| Autor: | Salah Eddine Elayoubi, Benoit Fourestie |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Computer Networks and Communications
Orthogonal frequency-division multiplexing business.industry Computer science Quality of service ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS MIMO Physical layer Hybrid automatic repeat request Link adaptation Data_CODINGANDINFORMATIONTHEORY Admission control WiMAX Computer Science Applications Adaptive coding Telecommunications link Computer Science::Networking and Internet Architecture Bit error rate Electrical and Electronic Engineering business Software Computer Science::Information Theory Computer network |
| Zdroj: | IEEE/ACM Transactions on Networking. 16:1200-1211 |
| ISSN: | 1558-2566 1063-6692 |
| DOI: | 10.1109/tnet.2007.911426 |
| Popis: | In this paper, we study the performance of multi-cell OFDMA WiMAX systems, in both downlink and uplink. We calculate analytically the number of collisions when the number of users in each cell is known. We then calculate the QoS indicators (e.g., blocking rates, download time and bit error rates) taking into account the physical layer conditions (modulation, propagation and MIMO), the MAC layer techniques (HARQ and radio resource management algorithms) and the traffic characteristics, in a cross-layer approach. We finally evaluate the impact of using adaptive modulation and coding on the overall performance of the system. This analysis allows us to calculate the Erlang capacity of a WiMAX system. Our numerical applications then show how to choose the best admission control and modulation schemes that extend the Erlang capacity region. |
| Databáze: | OpenAIRE |
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