ENGINEERING

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Browsing ENGINEERING by Author "ABBA, Aminu Muhammad"

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    DEVELOPMENT OF AN IMPROVED ERGODIC CAPACITY OF UNDERLAY COGNITIVE RADIO WITH IMPERFECT CHANNEL STATE INFORMATION
    (2017-07) ABBA, Aminu Muhammad
    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.