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In this paper, Cognitive Radio CDMA networks have been modeled and performances of primary user (PU) and secondary user (SU) have been investigated. PUs communicate to BS in our assumed model. However, SUs form pair wise ad hoc networks to maximize their data rates. In the process, they may interfere heavily in uplink at the BS. An efficient signal strength based algorithm has been proposed for gradual...
In this paper, outage performance of a frequency planned cognitive radio network has been studied. We consider dynamic spectrum sharing with spectrum underlay approach. Both secondary and primary users will access the same spectrum but primary user will be oblivious to the presence of cognitive user. Secondary users can change their radio parameters adaptively on demand. We consider correlation amongst...
In this paper, the performance of a Cognitive Radio (CR) CDMA networks is analyzed in uplink. More precisely, we develop a simulation testbed for analyzing performances of a CR user and a primary user (PU) in a single cell. CR users belong to infrastructure less ad hoc network, which coexist with a primary radio network (PRN). CR users or secondary users (SUs) are considered to form pair wise links...
In this paper, a simulation study has been carried out to evaluate performance of joint admission and power control (JAPC) algorithms in Cognitive - CDMA Networks. Performance has been evaluated for SU in an uplink scenario of CDMA network consisting primary user (PU) and secondary user (SU). A numbers of algorithms have been investigated. Long term fading has been assumed in addition to path loss...
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