Paper Info
Title
Pn Sequence Blind Estimation In Multiuser Ds-Cdma Systems With Multipath Channels Based On Successive Subspace Scheme
Abstract
In this paper, we proposed a new method based on expanding subspace algorithm and finite alphabet characteristics, for blind estimation of the users' spreading sequences in the multiuser direct sequence code division multiple access system in the presence of the multipath channels. In the proposed scheme, we show that the estimation of the users' overall channels in the direct sequence code division multiple access system is equivalent to the impulse response estimation of the multi-input multi-output finite impulse response channels. Our proposed approach is based on the successive estimation of the columns of the equivalent multi-input multi-output finite impulse response channels from the lowest degree columns to the highest degree ones. Accordingly, each user's overall channel that is the convolution of the original multipath channel and the spreading sequence is estimated. Then we extract PN sequences from the overall channel using finite alphabet characteristics of the spreading sequence chips for each user. According to simulation results, our proposed scheme outperforms the conventional methods in that it does not require symbol synchronization and does not have channel constraints (for example, AWGN and single user system) in the multipath channels.
Year
DOI
Venue
2018
10.1002/dac.3591
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
Keywords
Field
DocType
blind estimation, direct sequence code division multiple access (DS-CDMA) systems, finite alphabet, multipath fading channel, multiuser, PN sequence, subspace scheme
Multipath channels,Cdma systems,Subspace topology,Computer science,Algorithm,Real-time computing
Journal
Volume
Issue
ISSN
31
12
1074-5351
Citations 
PageRank 
References 
0
0.34
14
Authors
3
Name
Order
Citations
PageRank
Hossein Mirzadeh Sarcheshmeh100.34
H. Khaleghi Bizaki2184.27
S. Alizadeh3123.00