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Cognitive radio network with dirty paper coding for Concurrent access of spectrum by primary and secondary users

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Author Affiliations

  • 1Department of Computer and Electronics and Communication Engineering, Kathford International College of Engineering and Management, IOE, Balkumari, Lalitpur, Tribhuvan University, NEPAL
  • 2Department of Electronics and Computer Engineering, IOE, Central Campus, Pulchowk, Lalitpur, Tribhuvan University, NEPAL

Res. J. Engineering Sci., Volume 4, Issue (9), Pages 1-7, September,26 (2015)

Abstract

In the current architecture of dynamic spectrum access, also called as opportunistic spectrum co access, secondary user can only access the spectrum when there is no existence of primary carrier. The resurgence of primary user compels the secondary user to left the spectrum such that the communication of primary user shall not get disturbed. However, this disrupts the secondary user resulting the poor Quality of Service of secondary users. In this paper, a special architecture for concurrent spectrum access, termed as Dynamic Spectrum Co-Access (DSCA) is developed, to enable primary user as well as secondary user to simultaneously access licensed spectrum. With DSCA, secondary users transparently incentivize primary users by giving some of secondary’s power to relay codeword of primary user, which increases primary user signal to noise ratio i.e. performance , and secondary users can also access spectrum simultaneously with primary users. This is realized by using the special pre coding techniques called Dirty Paper Coding (DPC) to preserve signal over the interference. For that, a mathematical model is formulated to determine the minimum incentives for the spectrum co-access, computational analysis of region of co-access is done to determine where the secondary users that can co-access with a given primary user.

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