Accession Number ADA562485
Title Spectrum Shaping Challenges in Dynamic Spectrum Access Networks with Transmission Hyperspace.
Publication Date Jan 2012
Media Count 5p
Personal Author C. K. Mohan E. Masazade I. Kasperovich O. Ozdemir P. K. Varshney
Abstract Our goal in this paper is to discuss several issues and challenges involved with dynamic spectrum access in cognitive radio networks (CRNs). In this context, we introduce three optimization problems for spectrum shaping in cognitive radio networks (CRNs) using orthogonal frequency division multiplexing (OFDM). These optimization problems utilize the concept of transmission hyperspace (TH). The first problem involves maximization of sum- rate of the network under primary and secondary quality-of-service (QoS) constraints utilizing frequency and space dimensions of the TH. The second problem relaxes the omnidirectional assumption and incorporates antenna directionality in the first problem. As for the third problem, time dimension of the TH is added to the first two problems and the resulting problem is formulated as a time scheduling problem. We show that all these problems are NP- hard which requires the development of efficient heuristic algorithms.
Keywords Access
Antennas
Cognitive radio networks
Directional
Dynamic spectrum access
Frequency division multiplexing
Multi- objective optimization
Networks
Omnidirectional
Scheduling
Transmission hyperspace
Transmittance

 
Source Agency Non Paid ADAS
NTIS Subject Category 45C - Common Carrier & Satellite
Corporate Author Air Force Research Lab., Rome, NY. Information Directorate.
Document Type Technical report
Title Note Conference paper.
NTIS Issue Number 1225
Contract Number FA8750-10-C-0221

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