NDLI: Blind spreading sequence estimation algorithm for long-code DS-CDMA signals in asynchronous multi-user systems

Content Provider	IET Digital Library
Author	Liang, Jiang Hai Wang, Xiang Wang, Feng Hua Huang, Zhi Tao
Abstract	Despreading signal at receiver side requires prior knowledge of the spreading sequences in direct-sequence code division multiple access (DS-CDMA) system. However, the knowledge of spreading sequences is always unknown to the receiver in non-cooperative communication. Therefore the receiver has to estimate the spreading sequences in a blind manner. 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, the authors treat the spreading sequence estimation problem as a discrete optimisation search problem that can be solved efficiently by modern optimisation search methods. Moreover, they design a successive subspace deflation scheme to alleviate interference from other users. Numerical experiments demonstrate that the proposed algorithm provides good estimation of the spreading sequences for LC-DS-CDMA signals. Compared with the existing algorithms, the proposed algorithm exhibits much better performance in large system load scenario with low signal-to-noise ratio.
Starting Page	704
Ending Page	710
Page Count	7
ISSN	17519675
Volume Number	11
e-ISSN	17519683
Issue Number	Issue 6, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-spr/11/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-spr.2016.0506
Journal	IET Signal Processing
Publisher Date	2017-03-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous LC DS-CDMA Signal Asynchronous Long-code DS-CDMA Signal Asynchronous Multiuser System Blind Source Separation Code Division Multiple Access Direct-sequence Division Multiple Access System Discrete Optimisation Search Problem Introduction Blind Spreading Sequence Estimation Algorithm Large System Load Scenario LC-DS-CDMA Signal Multiple Access Communication Noncooperative Communication Optimisation Optimisation Technique Radio Link And Equipment Sequence Signal Processing And Detection Signal SubSpace Projection Characteristic Signal to Noise Ratio Spread Spectrum Communication SubSpace Deflation Scheme
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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