Results 261 to 270 of about 258,598 (299)

Spatial distributed dynamic spectrum access

2013 IEEE International Conference on Communications (ICC), 2013
The spatial aspect of distributed dynamic spectrum access (DSA) in a wireless ad hoc network is usually overlooked in the literature. By using tools from stochastic geometry, we analytically characterized the spatial distribution of users and subsequent interference in the network.
Ching-Yueh Kao, Weng-Chon Ao, Kwang-Cheng Chen   +2 more
openaire   +1 more source

A Markov Process for Dynamic Spectrum Access

2011 4th IFIP International Conference on New Technologies, Mobility and Security, 2011
In order to increase the efficient spectrum usage and to mitigate the current spectrum scarcity, dynamic spectrum access is considered to be an emerging technique. In this paper, based on the concept of dynamic spectrum access, we propose a Markov process that models the two-way interaction process between a primary and a cognitive radio user for ...
Mir, Usama, Merghem-Boulahia, Leila, Esseghir, Moez, Gaïti, Dominique   +3 more
openaire   +3 more sources

Dynamic spectrum access for small cells

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
More flexible spectrum access policies that take advantage of the cognitive radio capabilities of small cells are required to improve the suboptimal spectrum utilization at small cells. However, care must be taken to ensure that interference from autonomously deployed small cells is tightly controlled when developing such policies.
Ahmed Alsohaily, Elvino S. Sousa
openaire   +1 more source

A partial spectrum transmission method for dynamic spectrum access

2009 4th International Conference on Cognitive Radio Oriented Wireless Networks and Communications, 2009
This paper proposes a partial spectrum transmission (PST) method for dynamic spectrum access (DSA). For DSA, it is preferable to select modulation scheme which is appropriate for the low-priority user's condition and radio environment by taking into account the required E b /N 0 , frequency efficiency and PARR.
Yasunori Futatsugi, Shousei Yoshida, Masayuki Ariyoshi   +2 more
openaire   +1 more source

Dynamic spectrum access based on interruptible spectrum leasing

Wireless Networks, 2012
Dynamic spectrum access (DSA) based on interruptible spectrum leasing allows secondary users (SUs) to lease a licensed, but idle, spectrum that is owned by primary users (PUs) on condition that the PUs preempt the access to the leased spectrum. This paper considers a DSA scenario where the SUs opportunistically use the primary spectrum in addition to ...
Im, SY Im, Soo-Yeol, Jeon, H Jeon, Hyoung-Suk, Kim, SH Kim, Seung-Hee, Kim, JU Kim, Jin-Up, Lee, HJ Lee, Hyuck-Jae   +4 more
openaire   +2 more sources

Hybrid spectrum sharing in dynamic spectrum access networks

The International Conference on Information Networking 2013 (ICOIN), 2013
In this work, inefficient spectrum usage problem which will lead to spectrum scarcity in future communications has been addressed. According to Federal Communications Commission, spectrum sharing is a technique to efficiently utilize the spectrum. We analyse dynamic spectrum access concepts such as overlay spectrum sharing and underlay spectrum sharing.
Nair, Sabari Somasekharan, Schellenberg, Sebastian, Seitz, Jochen, Chatterjee, Mainak   +3 more
openaire   +2 more sources

Information Sharing in Spectrum Auction for Dynamic Spectrum Access

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference, 2009
Spectrum under-utilization is one of the bottlenecks of the development of wireless communication, and Dynamic Spectrum Access (DSA) is envisioned as a novel mechanism to solve the problem of spectrum scarcity. Spectrum Auction has been recognized as an effective way to achieve DSA, wherein the primary spectrum owner (PO) acts as an auctioneer who has ...
Hui Yu 0002, Lin Gao 0001, Yun Li, Xiaoying Gan, Xinbing Wang, Youyun Xu, Wen Chen 0001, Athanasios V. Vasilakos   +7 more
openaire   +1 more source

Spectrum Sensing for Dynamic Spectrum Access of TV Bands

2007 2nd International Conference on Cognitive Radio Oriented Wireless Networks and Communications, 2007
In this paper we address the issue of spectrum sensing in cognitive radio based wireless networks. Spectrum sensing is the key enabler for dynamic spectrum access as it can allow secondary networks to reuse spectrum without causing harmful interference to primary users. Here we propose a set of integrated medium access control (MAC) and physical layer (
Carlos Cordeiro 0001, Monisha Ghosh, Dave Cavalcanti 0001, Kiran S. Challapali   +3 more
openaire   +1 more source

Policy-based spectrum access control for dynamic spectrum access network radios

Journal of Web Semantics, 2009
We describe the design of a policy-based spectrum access control system for the Defense Advanced Research Projects Agency (DARPA) NeXt Generation (XG) communications program to overcome harmful interference caused by a malfunctioning device or a malicious user.
Filip Perich, Mark McHenry
openaire   +1 more source

COGNITIVE RADIOS FOR DYNAMIC SPECTRUM ACCESS - The Path to Market Success for Dynamic Spectrum Access Technology

IEEE Communications Magazine, 2007
Rapid progress is being made in the technology for dynamic spectrum access (DSA) radio systems. However, the structure and dynamics of the wireless services market must also evolve for DSA to succeed. This article examines the interlinked technical and economic issues associated with markets for DSA-based wireless services. We use this analysis to make
John M. Chapin, William H. Lehr
openaire   +1 more source