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Block circular delay diversity space-frequency codes with the enhanced performance
, Article 2012 6th International Symposium on Telecommunications, IST 2012 ; 2012 , Pages 416-419 ; 9781467320733 (ISBN) ; Shahabinejad, M ; Shahabinejad, M ; Talebi, S ; Sharif University of Technology
Abstract
In this paper, by applying a new permutation to the full-diversity block circular delay diversity (BCDD) space-frequency codes (SFCs), we show that their performance could be enhanced. Furthermore, we propose a new method for performing the permutation in the absence of partial channel state information at the transmitter. This new permutation, which is done based on artificial delay and power profiles (ADPPs), could improve the performance of the BCDD SFCs more than 3 dB as simulation results demonstrate
An optimum pre-filter for ICA based multi-input multi-output OFDM system
, Article International Journal of Innovative Computing, Information and Control ; Volume 7, Issue 6 , June , 2011 , Pages 3499-3508 ; 13494198 (ISSN) ; Asharif, M. R ; Khosravi, M ; Yamashita, K ; Sharif University of Technology
Abstract
This paper presents an optimum pre-filter for ICA based multi-input multi-output OFDM system. In our former work, we presented a pre-filter solution for multiuser reconstruction in ICA based MIMO-OFDM systems [1,2]. Here, based on the structure of the system and former pre-filter solution, an optimization problem has been designed to give us the optimum pre-filter. The designed problem is based on minimization of the estimation error of ambiguities inherent to ICA in reconstruction of the data after separation. The optimization problem is mathematically solved and a set of optimized coefficients are obtained. Among the obtained set as optimum coefficients, optimum coefficients are acquired...
An optimum pre-filter for ICA based mulit-input multi-output OFDM system
, Article ICETC 2010 - 2nd International Conference on Education Technology and Computer, 22 June 2010 through 24 June 2010 ; Volume 5 , 2010 , Pages V5129-V5133 ; 9781424463688 (ISBN) ; Alsharif, M. R ; Khosravi, M ; Yamashita, K ; Sharif University of Technology
Abstract
This paper presents an Optimum pre-filter for ICA based mulit-input multi-output OFDM System. In our former work, we presented a pre-filter solution for multiuser reconstruction in ICA based MIMO-OFDM systems [1], [2]. Here, based on the structure of the system and former prefilter solution, an optimization problem has been designed to give us the optimum pre-filter. The designed problem is based on minimization of the estimation error of ambiguities inherent to ICA in reconstruction of the data after separation. The optimization problem is mathematically solved and a set of optimized coefficients are obtained. Among the obtained set as optimum coefficients, optimum coefficients are acquired...