Wireless Communications and Mobile Computing, ( ISI ), Volume (1), No (14), Year (2014-1) , Pages (335-365)

Title : ( Novel spreading codes for multicarrier code division multiple access based cognitive radio networks with sidelobe suppression )

Authors: Morteza Rajabzadeh , Hossein Khoshbin Ghomash ,

Citation: BibTeX | EndNote

The deployment of multicarrier code division multiple access as the transmission scheme of the spectrum overlay based cognitive radio (CR) networks faces two challenging issues: (i) the need for spreading codes with arbitrary length and (ii) the interfering effect of the leaked power (due to spectral sidelobes) to the adjacent spectral band used by the primary system. To meet these challenges, we propose two novel complex spreading code sets. For this purpose, a cost function is defined as the ratio of the power leaked to the adjacent primary band to the power transmitted to the band allowed for CR operation. The cost function is shown to be convertible to a trace ratio problem. The two complex spreading code sets are determined by deploying two different standard solutions. The first is the conventional but approximate solution based on generalized eigenvalue decomposition (GEVD) method, and the other is an iterative algorithm that converges to the optimal solution and hence outperforms the GEVD based solution. Simulation results show that by a slight decrease in number of users, the code set yielded by iterative algorithm suppresses the leaked power to almost zero. The applicability of the proposed code sets in different scenarios is discussed. Copyright © 2012 John Wiley & Sons, Ltd.

Keywords

, cognitive radio; MC, CDMA; sidelobe suppression; spreading code
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@article{paperid:1028010,
author = {Rajabzadeh, Morteza and Khoshbin Ghomash, Hossein},
title = {Novel spreading codes for multicarrier code division multiple access based cognitive radio networks with sidelobe suppression},
journal = {Wireless Communications and Mobile Computing},
year = {2014},
volume = {1},
number = {14},
month = {January},
issn = {1530-8669},
pages = {335--365},
numpages = {30},
keywords = {cognitive radio; MC-CDMA; sidelobe suppression; spreading code design},
}

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%0 Journal Article
%T Novel spreading codes for multicarrier code division multiple access based cognitive radio networks with sidelobe suppression
%A Rajabzadeh, Morteza
%A Khoshbin Ghomash, Hossein
%J Wireless Communications and Mobile Computing
%@ 1530-8669
%D 2014

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