Blind joint estimation of channel order and the number of active users in direct sequence code‐division multiple‐access multi‐path channels. Issue 2 (1st April 2014)

• Record Type: Journal Article
• Authors: Samsami Khodadad, Farid; Abed Hodtani, Ghosheh
• Is Part Of: IET signal processing. Volume 8:Issue 2(2014)
• Page Start: 158
• Page End: 166
• Publication Date: 2014-04-01
• Subjects: code division multiple access -- estimation theory -- least mean squares methods -- MIMO communication -- multipath channels; blind joint estimation -- channel order -- direct sequence code‐division multiple‐access multi‐path channels -- parametric model -- equalisation -- finite impulse response -- multi‐input multi‐output systems -- minimum mean square error algorithm; Signal processing -- Periodicals; 621.3822
• DOI: 10.1049/iet-spr.2012.0296
• Languages: English
• ISSNs: 1751-9675

Abstract

Abstract : A new, reliable and computationally efficient blind method is proposed for joint estimation of channel order and number of active users in a direct sequence code‐division multiple‐access system with multi‐path fading channel. The proposed method (i) exploits a parametric model used for equalisation of multi‐path channels in finite impulse response multi‐input multi‐output systems, (ii) first, estimates rank of correlation matrix of observation, by combining the subspace method and information‐theoretic criteria, (iii) then, estimates simultaneously channel order and number of active users, by using the estimated rank and the model parameter, without any prior information, (iv) uses only a single antenna, in contrast to the previous methods, while having the ability to jointly estimate higher numbers of active users and channel order in lower signal‐to‐noise ratios. Numerical results show that the proposed method can estimate higher number of users and also has higher detection probability when using minimum mean square error algorithm.