1 / 6

Enhancing Spectrum Efficiency in 802.11 Wireless LANs through Flexible Channelization

As 802.11b/g Wireless LANs become increasingly congested, the conventional use of predefined channels and fixed channel widths limits spectrum efficiency. Our study explores flexible channelization techniques that allow for dynamic channel widths and center frequencies per transmission to optimize performance. We address challenges such as increased throughput with wider channels versus reduced Signal-to-Noise Ratio (SNR), the impact on carrier sensing, and interference management. This research aims to model link capacity while overcoming computational complexities in conflict graph creation, offering a TDMA-based approach for improved network performance.

karly-howe
Télécharger la présentation

Enhancing Spectrum Efficiency in 802.11 Wireless LANs through Flexible Channelization

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Flexible Channelization for 802.11 Wireless LANs Zafar AyyubQazi*, Zhibin Dou and Prof. Samir Das* *Department of Computer Science (WINGS lab), Stony Brook University Department of Computer Science, Tianjin University

  2. Problem • 802.11 b/g Wireless LANs becoming increasingly crowded • Only certain predefined channels and fixed channel widths used • Improve spectrum efficiency bychoosing a channel width and center frequency for each transmission • Goal: To understand how to employ flexible channelization when using multiple potentially interfering links

  3. Challenges • Increasing channel width potentially increases throughput • However for a constant transmit power, increasing channel width reduces Signal to Noise Ratio.

  4. Observations • Asymmetrical Carrier Sensing • No one configuration provides best performance in all the cases • Impact on Carrier Sensing • Impact on Hidden and Exposed terminals

  5. Possible Ways Forward • Modeling Link Capacity using SINR at the Receiver and the Interference level at the Sender: • Challenge: Computing a conflict graph for all channel widths, center frequencies—huge overhead! • TDMA Based Approach

  6. Thank You

More Related