NDLI: Blind multiuser data estimation in asynchronous and unequal power DS-SS systems without any prior knowledge of spreading sequences

Content Provider	IEEE Xplore Digital Library
Author	Ghavami, S. Alikhanian, H. Abolhassani, B. Rad, H.S.
Copyright Year	2009
Description	Author affiliation: Electrical Engineering Department, University of Pennsylvania, Philadelphia, 19104, USA (Rad, H.S.) \|\| Electrical Engineering Department, Iran University of Science and Technology, Tehran, 16846, Iran (Ghavami, S.; Alikhanian, H.; Abolhassani, B.)
Abstract	In this paper, a two phase algorithm is proposed for both blind synchronization and data sequence estimation of all users without any prior knowledge about spreading sequences in asynchronous unequal power multi-user direct sequence spread spectrum (DS-SS) systems. In the first phase, for blind synchronization, an eigenvalue variation (EV) based method is proposed, which uses all estimated eigenvalues related to signal, which are discriminated from noise eigenvalues by a threshold. In this paper, is shown EV to be a powerful tool for blind synchronization in eavesdropping scenarios in which unequal power signals are received from users. In the second phase, for blind data sequence estimation of all users, a variable step-size independent component analysis (ICA) algorithm based on negentropy maximization of active users is proposed using subspace as a preprocessing step. There is no need to know any spreading sequences for data estimation of users. Computer simulations confirm much better performance by the proposed algorithm at the cost of some more complexity compared with that of using only a pure subspace algorithm. Moreover, we compare the performance of the proposed blind synchronization with that of a successive blind synchronization, and we show that the proposed method is much faster.
Starting Page	1
Ending Page	6
File Size	340720
Page Count	6
File Format	PDF
ISBN	9781424433810
DOI	10.1109/SARNOF.2009.4850346
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-03-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay estimation Eigenvalues and eigenfunctions Maximum likelihood estimation Phase estimation Independent component analysis Multiaccess communication Multiple signal classification Surveillance Transmitters Maximum likelihood detection subspace estimation DS-SS Blind synchronization Blind sequence estimation ICA Negentropy
Content Type	Text
Resource Type	Article

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