DocumentCode :
1117272
Title :
Fundamental limits of spectrum-sharing in fading environments
Author :
Ghasemi, Amir ; Sousa, Elvino S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont.
Volume :
6
Issue :
2
fYear :
2007
Firstpage :
649
Lastpage :
658
Abstract :
Traditionally, the frequency spectrum is licensed to users by government agencies in a rigid manner where the licensee has the exclusive right to access the allocated band. Therefore, licensees are protected from any interference all the time. From a practical standpoint, however, an unlicensed (secondary) user may share a frequency band with its licensed (primary) owner as long as the interference it incurs is not deemed harmful by the licensee. In a fading environment, a secondary user may take advantage of this fact by opportunistically transmitting with high power when its signal, as received by the licensed receiver, is deeply faded. In this paper we investigate the capacity gains offered by this dynamic spectrum sharing approach when channels vary due to fading. In particular, we quantify the relation between the secondary channel capacity and the interference inflicted on the primary user. We further evaluate and compare the capacity under different fading distributions. Interestingly, our results indicate a significant gain in spectrum access in fading environments compared to the deterministic case
Keywords :
channel allocation; channel capacity; fading channels; radiofrequency interference; dynamic spectrum sharing; fading channels; fading environments; frequency spectrum; interference; secondary channel capacity; Channel capacity; FCC; Fading; Force measurement; Frequency; Government; Interference; Protection; Radio spectrum management; Temperature;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2007.05447
Filename :
4100173
Link To Document :
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