Title :
Clear channel assessment in energyconstrained wideband wireless networks
Author :
Ramachandran, Iyappan ; Roy, Sumit
Author_Institution :
Univ. of Washington, Seattle
fDate :
6/1/2007 12:00:00 AM
Abstract :
This is intended as a tutorial review of the clear channel assessment (CCA) component of typical data link layers in wideband wireless networks that employ some form of channel sensing as part of their medium access mechanism. While channel sensing - the core component within CCA module - is implemented at the physical layer, its primary impact is on MAC throughput and energy efficiency, and this impact has not yet been adequately highlighted in the existing literature. We provide a description of CCA methods for wideband wireless networks like IEEE 802.11 and IEEE 802.15 followed by illustrations of their impact on the respective MAC protocols. We also demonstrate the need for a cross-layer consideration of MAC and CCA to optimize the performance of CSMA protocols.
Keywords :
access protocols; broadband networks; personal area networks; wireless LAN; wireless channels; IEEE 802.11; IEEE 802.15; MAC throughput; carrier sense multiple aaccess protocols; channel sensing; clear channel assessment; energy-constrained wideband wireless networks; 1f noise; Bandwidth; Envelope detectors; Floors; Frequency; Narrowband; RF signals; Wideband; Wireless networks; Wireless sensor networks;
Journal_Title :
Wireless Communications, IEEE
DOI :
10.1109/MWC.2007.386615