Power adaptation for cognitive radio systems under an average sinr loss constraint in the absence of path loss information
Author
Dulek, B.
Gezici, Sinan
Sawai, R.
Kimura, R.
Date
2014Source Title
Wireless Personal Communications
Print ISSN
0929-6212
Publisher
Kluwer Academic Publishers
Volume
77
Issue
1
Pages
151 - 172
Language
English
Type
ArticleItem Usage Stats
126
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views
90
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downloads
Abstract
An upper bound is derived on the capacity of a cognitive radio system by considering the effects of path loss and log-normal shadowing simultaneously for a single-cell network. Assuming that the cognitive radio is informed only of the shadow fading between the secondary (cognitive) transmitter and primary receiver, the capacity is achieved via the water-filling power allocation strategy under an average primary signal to secondary interference plus noise ratio loss constraint. Contrary to the perfect channel state information requirement at the secondary system (SS), the transmit power control of the SS is accomplished in the absence of any path loss estimates. For this purpose, a method for estimating the instantaneous value of the shadow fading is also presented. A detailed analysis of the proposed power adaptation strategy is conducted through various numerical simulations.
Keywords
CapacityCognitive radio
Path loss
Power control
Shadowing
Water-filling
Cognitive radio
Communication channels (information theory)
Power control
Capacity
Path loss
Perfect channel state information
Secondary interference
Shadowing
Transmit power control
Water-filling power allocations
Waterfilling
Radio systems
Permalink
http://hdl.handle.net/11693/26615Published Version (Please cite this version)
http://dx.doi.org/10.1007/s11277-013-1499-8Collections
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