Research Article
Impact of the Transmission Scheme on the Performance in Wireless LANs
@INPROCEEDINGS{10.1007/978-3-642-03819-8_29, author={Andreas K\o{}nsgen and Andreas Timm-Giel and Carmelita G\o{}rg and Ronald B\o{}hnke}, title={Impact of the Transmission Scheme on the Performance in Wireless LANs}, proceedings={Mobile Lightweight Wireless Systems. First International ICST Conference, MOBILIGHT 2009, Athens, Greece, May 18-20, 2009, Revised Selected Papers}, proceedings_a={MOBILIGHT}, year={2012}, month={6}, keywords={Wireless LAN cross-layer MIMO}, doi={10.1007/978-3-642-03819-8_29} }- Andreas Könsgen
Andreas Timm-Giel
Carmelita Görg
Ronald Böhnke
Year: 2012
Impact of the Transmission Scheme on the Performance in Wireless LANs
MOBILIGHT
Springer
DOI: 10.1007/978-3-642-03819-8_29
Abstract
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.