Journal Article10.1049/IET-SPR.2008.0254
Blind multiuser spreading sequences estimation algorithm for the direct-sequence code division multiple access signals
19
TL;DR: In this article, a blind multiuser spreading sequences estimation algorithm for the direct-sequence code division multiple access (DS-CDMA) signals is presented, where the spreading sequences are divided into short-time segments so as to recover them in a sequential procedure.
read more
Abstract: By combining the multiple signal classification (MUSIC)-based algorithm, proposed by Haghighat and Soleymani, and the segmentation-based idea, a blind multiuser spreading sequences estimation algorithm for the direct-sequence code division multiple access (DS-CDMA) signals is presented in this study The main idea of the proposed algorithm is to divide the spreading sequences into short-time segments so as to recover them in a sequential procedure First, the received signal samples are divided into K collections of temporal windows Each collection is corresponding to a group of short-time segments of the spreading sequences Secondly, by performing a sub-segmentation-based estimation scheme on the first collection of temporal windows, the first short-time segments of all the users' spreading sequences are extracted Finally, with the help of the segments acquired in advance, the remaining segments of the spreading sequences can be recovered chip-by-chip through K−1 subspace projection loops This algorithm can be applied not only to the synchronous short-code (SC) DS-CDMA signals, but also to the long-code (LC) DS-CDMA signals in non-cooperative contexts, even with minus SNR Simulations are presented to illustrate the performance of the proposed method In addition, for the synchronous SC-DS-CDMA signals, the computational cost of the proposed algorithm is much lower than that of the MUSIC-based algorithm Furthermore, a derivation for blind synchronisation of the synchronous SC-DS-CDMA signals is also presented
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Blind spreading sequence estimation algorithm for long-code DS-CDMA signals in asynchronous multi-user systems
TL;DR: This study presents a novel algorithm to estimate the spreading sequences for asynchronous long-code (LC) DS-CDMA signals by investigating the projection characteristics of the signal subspace and design a successive subspace deflation scheme to alleviate interference from other users.
16
A Charrelation Matrix-Based Blind Adaptive Detector for DS-CDMA Systems.
Zhongqiang Luo,Lidong Zhu +1 more
TL;DR: Theoretical analysis and simulation results show that the improved performance of the proposed algorithm in comparison with the existing conventional algorithms used in DS-CDMA systems is significant.
15
PN sequence blind estimation in multiuser DS-CDMA systems with multipath channels based on successive subspace scheme
TL;DR: The 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.
12
Blind Estimation of the PN Sequence of A DSSS Signal Using A Modified Online Unsupervised Learning Machine.
TL;DR: Simulation results showed that the methods mentioned above can estimate the PN sequence rapidly and robustly, even when the DSSS signal is far below the noise level.
12
Signal detection in passive wireless sensor networks based on back-propagation neural networks
Ali Abedi
- 05 Apr 2011
TL;DR: A novel method for passive wireless sensing employing back-propagation neural network is proposed, which demonstrates near-optimum performance in side-lobe suppression, while requiring a much lower implementation complexity compared to conventional receivers.
7
References
Blind estimation of direct sequence spread spectrum signals in multipath
TL;DR: A multirate, discrete-time model of the spread spectrum signal is introduced, which links this problem with array processing techniques and borrows blind channel estimation ideas, originally developed in the context of fractionally spaced equalizers or receivers with multiple antennas.
148
Blind estimation of direct sequence spread spectrum signals in multipath
Michail Tsatsanis,Georgios B. Giannakis +1 more
- 30 Oct 1995
TL;DR: In this article, blind estimation of the time delay, multipath parameters and unknown spreading code of a direct sequence spread spectrum (DS-SS) signal is proposed for interception or jamming purposes, or for acquiring a new user in a multiuser CDMA system.
99
Performance Analysis of a Spreading Sequence Estimator for Spread Spectrum Transmissions
TL;DR: A new method which can estimate the spreading sequence in a noncooperative context based on eigenanalysis techniques is proposed, and it is shown that the sequence can be reconstructed from the two first eigenvectors of this matrix, and that useful information can be extracted from the eigenvalues.
Spread-spectrum sequence estimation for DSSS signal in non-cooperative communication systems
TL;DR: An innovative and effective algorithm is proposed to estimate the spread-spectrum sequence of a direct spread-Spectrum sequence (DSSS) signal in non-cooperative communication systems using a measurement function and a detection statistic developed based on the idea of correlation.
40
Eavesdropping in the synchronous CDMA channel: an EM-based approach
Yingwei Yao,V. Poor +1 more
TL;DR: The problem of blind detection in a synchronous code division multiple access (CDMA) system when there is no knowledge of the users' spreading sequences is considered and an expectation maximization (EM)-based algorithm that exploits the finite alphabet property of the digital communications source is proposed.
38