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Secondary Market Mobile Users for Internet Access
2015 IEEE 14th International Symposium on Network Computing and Applications, 2015There is a fast growing number of public spaces offering Wi-Fi access to meet the rising demands for the Internet. It is common for such service to be offered to users at no charge or for a flat fee. Both situations provide very little incentive for Wi-Fi providers to offer better service to the users. Similarly, Wi-Fi providers pay a monthly flat-rate
Hengky Susanto +6 more
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On the secondary users opportunistic scheduling with reduced feedback
Third International Conference on Communications and Networking, 2012In underlay cognitive radio systems, secondary users (SUs) can share the spectrum with primary users (PUs) as long as the interference caused by SUs to PUs is below a certain threshold. When multiple SUs want to access the channel, multiuser diversity scheme can be applied to maximize the utilization rate of the channel.
Yao Song, Mohamed-Slim Alouini
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Localization of Primary Users by Exploiting Distance Separation Between Secondary Users
2015Accurate localization of Primary Users (PUs) is an extremely useful procedure which can improve the performance of Cognitive Radio (CR) by more efficient dynamic allocation of channels and transmit powers for unlicensed users. In this paper, we analyze the performance of a Compressive Sensing (CS) method which simultaneously yields the PU transmitter ...
Audri Biswas +4 more
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Accessible capacity of high-mobility secondary users
2014 International Workshop on High Mobility Wireless Communications, 2014In this paper, we are concerned with an asymmetric multiple-access channel (MAC) model with two users, which are distinguished as primary user and secondary user, respectively, according to their mobility. The low-mobility user (primary user) has a time-invariant uplink and employs a single-user code that was originally designed to satisfy a given ...
Nina Lin, Xiao Ma 0001, Chulong Liang
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Throughput enhancement for secondary users in cognitive network
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013Cognitive radio is an exciting emerging technology that has the potential of dealing with the stringent requirement and scarcity of the radio spectrum. Such revolutionary and transforming technology represents a paradigm shift in the design of wireless systems as it will offer the ability of radio sensing, self adaptation and dynamic spectrum sharing ...
Imen Sahnoun +2 more
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Secondary User Friendly TDMA Scheduling for Primary Users in Cognitive Radio Networks
GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference, 2009Cognitive radio technology is widely accepted as an efficient approach to solve the problem that the wireless spectrum has been getting scarcer and scarcer due to the rapid growth in the ubiquitous wireless applications. Several cognitive medium access control (MAC) protocols have been proposed for the secondary users (non-licensed users) to take ...
Hang Su 0007, Xi Zhang 0005
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Dynamic Spectrum Sharing with Multiple Primary and Secondary Users
2010 IEEE International Conference on Communications, 2010Dynamic spectrum sharing in cognitive radio networks can enhance flexibility, and as a result the efficiency of spectrum usage. In this paper, we address the problem of spectrum sharing in a cognitive radio network where multiple primary and secondary strategic-users are involved.
Peng Lin 0003 +3 more
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Aggregate interference from secondary users with heterogeneous density
2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications, 2011This paper presents an analytical model to approximate the probability distribution function of the aggregate interference that a primary user receives from multiple secondary transmitters. In particular, we consider heterogeneity in spatial distribution of secondary users such that there are several sites with densely populated secondary users in the ...
Miurel Tercero, Ki Won Sung, Jens Zander
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Cyclostationary Detection of Undefined Secondary Users
2009 Third International Conference on Next Generation Mobile Applications, Services and Technologies, 2009Spectrum sensing has continued to emerge as an essential topic for the cognitive networks where two kinds of users primary and secondary will share the band. This paper proposes a method for real-time detection of secondary users at the base stations.
Anwer Al-Dulaimi +2 more
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On the availability of CDMA channels for secondary users
2010 3rd International Symposium on Applied Sciences in Biomedical and Communication Technologies (ISABEL 2010), 2010The present paper is analysing the occupancy of the radio spectrum for some typical CDMA communications systems. The paper presents also an analysis of how the available channel are used by the communications system and especially of how other available channels could be detected. As example, the paper presents also how the IMT-2000 uplink bands can be
O. Fratu +4 more
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