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A novel dynamic clustering based cooperative spectrum sensing (CSS) scheme with improved energy detectors (IEDs) has been studied for a cognitive radio (CR) network. A novel expression for dynamic clustering is developed considering Rayleigh faded sensing (S) and reporting (R) channels. The missed detection probability, total error probability are considered as performance metrics and studied with...
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...
In this paper the performance of a cognitive radio (CR)network is investigated under harvesting of energy from combined RF signal and ambient sources, i.e., non-RF signal. The CR harvests energy from ambient sources as well as from primary user (PU) signal depending on the sensing decision. The quality of service (QoS) of PU is protected in terms of collision probability. The performance has been...
In this paper, we study a hybrid fusion scheme for cooperative spectrum sensing (CSS) where we combine the hard decisions and soft decisions from cognitive radio (CR) users based on quality of their reporting channel (R-channel). The CR users transmit their hard decisions if the estimated R-channel between them and the fusion centre (FC) exceeds censoring threshold else they send soft decision, i...
The performance of cooperative spectrum sensing (CSS) with multi-slot sensing has been investigated. A number of cognitive radio (CR) enabled users sense the primary user (PU) spectrum in multiple sensing mini-slots and the decision of each slot is combined using OR rule to evaluate the local decision about PU. All the CRs send their local decisions over faded reporting channels (R-channel) to fusion...
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, the performance of cooperative spectrum sensing (CSS) with censoring of cognitive radios (CRs) has been evaluated using a simple majority logic fusion in presence of Rayleigh fading affecting both the sensing (S) and reporting (R) channels. Each CR senses the primary user (PU) using a double threshold based energy detection over the sensing channel. Censoring of CRs is done on the basis...
The cognitive nodes which are far away from primary user (PU) may not be able to detect the PU due to severe fading in channel. To improve the efficiency of spectrum sensing, we propose a co operative communication scheme based on cognitive relaying. Cognitive relay nodes sense the activity of PU and forward the received data to the Cognitive radio (CR) which is far a way from the PU. In this condition,...
In cognitive radio (CR) network spectrum sensing is an important issue. Cooperative spectrum sensing improves the detection probability. The accuracy in taking decision about the presence of primary user (PU) depends on sensing time and number of CR users involving in cooperation. A CR network can be efficient if it performs the detection process with minimum error probability and at the same time...
In this paper, we present performance analysis of spectrum sensing with an improved energy detector under path loss condition. The path loss factor is normally avoided in connection with spectrum sensing. Performance analysis has been carried out in a multiple antenna based cognitive radio (CR) network. The CR with improved energy detector uses selection combining for efficient sensing of spectrum.
Efficient control of transmission power of secondary users (SUs) in an underlay cognitive radio network (CRN) is needed to limit interference on primary users (PUs). Decision regarding the presence of primary user (PU) helps in controlling transmission power of secondary user (SU). In this paper a scheme on joint power control of SUs is investigated. Power control of SUs to minimize interference on...
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