Research Article
Spectrum Occupancy Estimation in Wireless Channels with Asymmetric Transmitter Powers
@INPROCEEDINGS{10.1109/CROWNCOM.2007.4549804, author={John T. MacDonald and Dennis A. Roberson}, title={Spectrum Occupancy Estimation in Wireless Channels with Asymmetric Transmitter Powers}, proceedings={2nd International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications}, publisher={IEEE}, proceedings_a={CROWNCOM}, year={2008}, month={6}, keywords={Artificial satellites Base stations Cognitive radio Interference Radar detection Radio frequency Radio transmitters Receivers Satellite broadcasting Spaceborne radar}, doi={10.1109/CROWNCOM.2007.4549804} }- John T. MacDonald
Dennis A. Roberson
Year: 2008
Spectrum Occupancy Estimation in Wireless Channels with Asymmetric Transmitter Powers
CROWNCOM
IEEE
DOI: 10.1109/CROWNCOM.2007.4549804
Abstract
In proposed cognitive radio schemes, channel occupancy is often offered as the metric to determine if a channel is free to open a new communication channel. Channel occupancy is the time average of detected transmissions above a certain power level. In many systems the transmission power between the uplink side and down-link side are asymmetric. If a single power threshold is used, then a system may underestimate channel occupancy on the low power down-link side. This results in an increased probability of interference in an existing channel if a listen-before-talking scheme is used. To avoid this hidden terminal problem, cognitive radios need to better understand the receiver properties of existing wireless channels.
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