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In this paper, power control of secondary user (SU) is investigated. In co-existing network, minimization of interference on primary user (PU) can be achieved through controlling the transmission power of cognitive radio (CR) user. Improved sensing decision reduces the interference on PU (IoPU) efficiently through improved energy detector (IED) based cooperative spectrum sensing (CSS). Allowable maximum...
The transmit power of secondary users (SUs) in an underlay cognitive radio network (CRN) needs to be controlled to limit the interference on primary users (PUs). The performance of spectrum sensing plays an important role in controlling the cognitive radio (CR) transmission power. Co-operative spectrum sensing (CSS) improves the performance of spectrum sensing. Incorporation of Rank-based censoring...
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, we propose a framework for analyzing downlink performance of cellular CDMA network without considering retransmission protocol in MAC layer. More specifically, we develop a simulation testbed for analyzing broadcast performance of WCDMA network in presence of both PHY layer and application layer forward error correction (FEC) codes only. In physical layer, low density parity check (LDPC)...
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...
This paper presents an array antenna composed of 4 identical circularly polarised aperture-coupled-fed stacked patches for mitigation of GPS interference. The individual radiating elements have been designed to cover the three GPS frequency bands L1, L2 and L5, with a good polarisation ratio over the top hemisphere. Two array topologies are considered. The characteristics of the arrays are presented...
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