Abstract
Cognitive radio is often considered as means to achieve more efficient
use of radio spectrum. The achievable gain, how-ever, is highly dependent on
the characteristics of the traffic existing on the band cognitive radio uses
for transmission
as well as on the method that cognitive radio uses to obtain the information
on the availability of the spectrum. In this
paper, studies are conducted on the achievable throughput using cognitive
radio principles on a spectrum band occupied
by data traffic. Data traffic with two different set of parameters is used in
order to study the impact of how frequently
primary user's channel state changes to the performance. In the
investigations, cognitive radio uses energy detection
to obtain knowledge about the spectrum opportunities. It performs a simple
loop with defined sensing, transmission
and waiting times. The waiting time refers to a time period which the
cognitive radio system waits before sensing the
spectrum again in the case of an occupied channel. The influence of the
waiting time has not been studied before since
traditionally sensing has been assumed to take place in the beginning of each
frame. Sensing time is influenced by target probabilities of false alarm and
detection. The effect of these probabilities and the waiting time on the
performance
are investigated in a scenario considering one cognitive radio in a single
spectrum band. The results are given as the percentage of spectrum
opportunities found, the amount of interference caused to the primary user as
well as the amount
of time used for spectrum sensing. The achievable throughput is dependent on
the probability of false alarm, whereas
probability of detection affects the interference caused to the primary user.
The results show that an alternative way to
significantly reduce the interference to the primary user is to increase the
waiting time. By doing this also the amount of sensing time required can be
considerably reduced.
Original language | English |
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Title of host publication | Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management, CogART '11 |
Publisher | Association for Computing Machinery ACM |
ISBN (Print) | 978-1-4503-0912-7 |
DOIs | |
Publication status | Published - 2011 |
MoE publication type | A4 Article in a conference publication |
Event | 4th International Conference on Cognitive Radio and Advanced Spectrum Management, CogART'11 - Barcelona, Spain Duration: 26 Oct 2011 → 29 Oct 2011 Conference number: 4 |
Conference
Conference | 4th International Conference on Cognitive Radio and Advanced Spectrum Management, CogART'11 |
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Abbreviated title | CogART'11 |
Country | Spain |
City | Barcelona |
Period | 26/10/11 → 29/10/11 |
Keywords
- Spectrum sensing
- energy detection
- cognitive radio
- throughput