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In this paper, a simulation study has been performed to evaluate outage performance of Primary Users (PUs) in cognitive radio network (CRN). Due to the beacon miss-detection by Secondary Users (SUs), SUs cause the interference to PUs and affect the performance of a PU. We evaluate mean interference and outage probability of a PU in alognormal shadow fading environment.
Detection is compromised when a cognitive radio (CR) user experiences deep shadowing or fading effects. In order to detect the primary user (PU) more accurately, we allow the CR users to cooperate by sharing their information. In this paper we investigate performance of cooperative spectrum sensing scheme using energy detection (ED-CSS) to improve the sensing performance in channels such as log-normal...
Performance of cooperative spectrum sensing has been assessed in presence of Rayleigh fading. Cognitive radio (CR) users which employ energy detectors are censored depending on the quality of radio channels between them and a fusion center (FC). A training based channel estimator is used at the FC to estimate the complex Gaussian fading coefficients characterizing the channels between the CR users...
In tactical communication systems, WLANs are very popular options due to their high data rate. Motivated by the work of [1], we investigate performance of newly developed signal strength ratio (SSR) based handoff algorithms in tactical communication systems using WLANs. We obtain better performance in terms of number of handoff, packet loss rate and throughput for SSR based handoff algorithms. Performance...
In this paper, coexistence of cellular network with cognitive radio (CR) users or secondary users (SUs) has been studied. More precisely, an analytical frame work for downlink interference modelling in a cognitive radio frequency planned environment has been developed. Outage performance of a PU in a frequency planned cognitive radio network has been investigated. Dynamic spectrum sharing with spectrum...
Performance of cooperative spectrum sensing has been assessed in presence of Rayleigh fading. Cognitive radio (CR) users which employ energy detectors are censored depending on the quality of radio channels between them and a fusion center (FC). Each CR makes a hard decision about primary user (PU) using energy detection and transmits the information to FC using BPSK signaling if the CR user is selected...
Detection is compromised when a cognitive radio (CR) user experiences deep shadowing or fading effects. In order to detect the primary user (PU) more accurately, we allow the CR users to cooperate by sharing their information. In this paper we investigate performance of cooperative spectrum sensing scheme using energy detection (ED-CSS) to improve the sensing performance in channels such as Rician...
In order to enable access to underutilized licensed spectrum, a secondary user has to monitor licensed bands and detects occupancy of primary users in the different parts of the spectrum. However, detection is compromised when a user experiences shadowing or fading effects. In this paper we evaluate the performance of cognitive radio with energy detection based spectrum sensing (ED-SS) in AWGN, and...
In this paper, we propose a scheme to evaluate performance of data services of secondary users (SUs) in Cognitive Radio (CR) CDMA networks. Specifically, we develop a simulation test bed for analyzing throughput and delay performances of a SU in a single cell, where primary users (PUs) are present in an exclusive region of operation, viz., primary exclusive region. CR users or SUs which are present...
In this paper, we propose a novel algorithm to remove secondary users (SUs) in a Cognitive Radio (CR) CDMA network to maintain a predefined interference threshold at BS. Specifically, we develop a simulation test bed for analyzing performances of a CR user and a primary user (PU) in a single cell. CR users or SUs are assumed to form pair wise link in an infrastructure less ad hoc network that coexists...
In this paper, performance analysis of Multimedia Broadcast and Multicast Services (MBMS) in cellular CDMA considering a soft HO algorithm has been carried out. Performance has been studied considering the fact that broadcast takes place only at a single base station (BS). A 19 cell cluster has been assumed for evaluating signal to interference ratio (SINR) at user terminal. SINR is chosen dynamically...
In this paper, a simulation study has been carried out to evaluate performance of a new call admission control algorithm for secondary users in CDMA based Cognitive Radio Networks (CRNs). Performance has been evaluated for secondary users (SUs) in an uplink scenario of CDMA network consisting of cognitive users or secondary users (SUs) and Base Station (BS). A primary receiver (PRx) is also assumed...
Forward link performance of data services has been evaluated in cellular CDMA network by incorporating low density parity check (LDPC) codes in presence of soft handoff. This scheme is found to enhance throughput while reducing delay and packet error rate significantly. A stop and wait ARQ has been assumed in link layer. Both the cases of coded and uncoded data transmission are investigated.
In this paper, we propose a scheme to evaluate throughput delay performance of secondary users (SUs) in a cognitive radio (CR) CDMA network. Specifically, we develop a simulation test bed for analyzing performance of a SU in a single cell, where both SUs and primary users (PUs) are present. CR users or SUs belong to an infrastructure less ad hoc network, which coexists with a primary radio network...
Performance analysis of data services is studied in CDMA network by incorporating Low Density Parity Check (LDPC) codes in presence of soft handoff. This scheme is found to enhance throughput and reduce delay and packet error rate significantly. A stop and wait ARQ has been assumed. Both the cases of coded and un-coded data transmission are investigated.
In this paper, the performance of Cognitive Radio (CR) CDMA networks is analyzed. More precisely, we develop a simulation testbed for analyzing the performance of a CR user with and without spectrum sensing in a three cell scenario. Three different schemes for spectrum sensing are studied. CR users belong to a Cognitive Radio Network (CRN) which is coexisting with a Primary Radio Network (PRN). Both...
Received Signal Strength Indicator (RSSI) is one of the key handover criteria for Mobile Cellular Systems. Present day systems allow Mobile Station (MS) to have distance information for emergency calls, road side assistance etc. If distance and RSS are considered together as handover criteria then they can provide very good performance and combat worst case handover scenario. This paper proposes a...
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