Impact of the transmission scheme on the performance in wireless LANs

Publikationstyp
Conference Paper
Date Issued
2009-05
Sprache
English
Author(s)
Konsgen, Andreas  
Timm-Giel, Andreas  orcid-logo
Görg, Carmelita  
Böhnke, Ronald  
TORE-URI
http://hdl.handle.net/11420/12022
First published in
Lecture notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering  
Number in series
13 LNICST
Start Page
303
End Page
314
Citation
Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering 13 LNICST: 303-314 (2009-12-01)
Contribution to Conference
1st International Conference on Mobile Lightweight Systems, MOBILIGHT 2009  
Publisher DOI
10.1007/978-3-642-03819-8_29
Scopus ID
2-s2.0-84885889497
Publisher
Springer
In wireless LANs, different multi-user access methods such as TDMA, OFDMA and SDMA are available which can be used with or without channel knowledge at the transmitter and a single antenna (MISO) or multiple antennas (MIMO) at the receiver. A cross-layer scheduler is considered which can be configured with these different PHY methods as well as with knowledge about application requirements and channel conditions at the MAC layer. The scheduler computes priorities on the MAC layer that are handed over to the physical layer in order to keep quality-of-service constraints such as throughput and delay. In this paper, it is demonstrated that controlling the priorities by a QoS aware resource allocation method allows to meet the requirements by the applications under various channel conditions. MISO-SDMA has a relatively small performance penalty in comparison to MIMO-SDMA which gives the best result. For MIMO-TDMA and -OFDMA, channel knowledge at the PHY layer does not result in essential performance enhancement. © ICST Institute for Computer Sciences.© Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering 2010.
Subjects
Cross-layer
MIMO
Wireless LAN
DDC Class
004: Informatik