DEVELOPMENT OF AN IMPROVED ERGODIC CAPACITY OF UNDERLAY COGNITIVE RADIO WITH IMPERFECT CHANNEL STATE INFORMATION
DEVELOPMENT OF AN IMPROVED ERGODIC CAPACITY OF UNDERLAY COGNITIVE RADIO WITH IMPERFECT CHANNEL STATE INFORMATION
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Date
2017-07
Authors
ABBA, Aminu Muhammad
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Abstract
This research work presentsthedevelopment of an improved ergodic capacity of underlay
Cognitive Radio (CR) with imperfect Channel State Information(CSI). An underlay CR
network under a Peak Interference Power (PIP) constraint imposed by a Primary User
(PU) was considered.Aclosed formergodic capacity expression of the Secondary User
(SU)under PIP constraintwas derivedin order to determine the ergodic capacity under
different fading types using Nakagami-m distributions.The m-parameter of the
Nakagami-m fading channel measures the ratio of the Line-of-Sight (LoS) signal power
to that of the multipath component. The improved ergodic capacity expression developed
was validated with the existing ergodic capacity expression at m=1. The results showed
that the ergodic capacity of the SU could be extended to different fading types in the CR
path by adjusting the m-parameter.The impact of channel estimation errors, 2 and
channelcorrelation coefficient, on the SUergodic capacity was studiedunder different
fading types to provide an insight on the capacity behavior of CR network. The
resultsobtained atdifferent values of m parametersshowedthe ergodic capacity degraded
as a result of increasing 2 and it increases with increasing .It was observed that at
m=1/2,1,2 and 3, a significant capacity gains of 21.65%, 19.71%, 17.43%, and 15.82%
were achieved, when 3% interference outage out P was considered for all the m values
from 2 1 to 2 0 . However, a capacity gains of 23.59%, 22.31%, 21.02%, and
20.26% were also achieved respectively at 1% out P . It was also found that at m=1/2,1,2
and 3, a spectral efficiency in (bits/S/Hz) of 0.5007, 0.2888,0.2660, and 0.2596 were
achieved when 3% out P was considered from 0 to 1, while a spectral efficiency
of 0.2548, 0.1771, 0.1211, 0.0931 were also achieved at 1% P for the respective m values.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER OF SCIENCE DEGREE (MSc) IN TELECOMMUNICATIONS ENGINEERING DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING, FACULTY OF ENGINEERING, AHMADU BELLO UNIVERSITY, ZARIA NIGERIA
Keywords
DEVELOPMENT,, IMPROVED ERGODIC CAPACITY,, UNDERLAY COGNITIVE RADIO,, IMPERFECT CHANNEL STATE INFORMATION,