NDLI: Digital blind despreading method for intermediate frequency short-code DSSS signal

Content Provider	IET Digital Library
Author	Qiu, Zhaoyang Peng, Hua Li, Tianyun
Abstract	Direct sequence spread spectrum (DSSS) signals are widely used in various military and civilian communication systems owing to its useful properties, such as lower working signal-to-noise ratio, strong anti-jamming capability, and robustness to multi-path fading. In past few years, the estimation for spreading sequence in non-cooperative context has attracted lots of attention. Several methods are developed to realise a recovery of the sequence. Eigenvalue decomposition (EVD) is a classical method to obtain an effective estimation by extracting the main eigenvectors. The only obstacle to apply EVD method into practical systems is high complexity of computation when spreading sequence is long. Alternative algorithms such as neural network and clustering method have lower complexity, but an evident loss in performance. In this work, the authors propose to generalise the EVD algorithm to intermediate frequency (IF) short-code DSSS with an unknown carrier offset. The blind despreading process is designed to complete correlation demodulation. As a result, the computational afford is largely decreased due to the operation on IF real signal. To evaluate the performance, they derive the Crammer-Rao bound for spreading code estimation and compare the performance of several methods. Simulation demonstrates the superiority of the proposed method in estimation accuracy and runtime.
Starting Page	2360
Ending Page	2368
Page Count	9
ISSN	17518628
Volume Number	14
e-ISSN	17518636
Issue Number	Issue 14, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/14/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2019.0351
Journal	IET Communications
Publisher Date	2020-06-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Baseband Signal Blind Despreading Process Civilian Communication System Clustering Method Code Code Division Multiple Access Code Synchronisation Communication Complexity Crammer-Rao Bound Decomposition Demodulation Digital Blind Despreading Method Direct Sequence Spread Spectrum Signal Eigen Values And Eigen Function Eigenvalue Decomposition EVD Algorithm IF DSSS Intermediate Frequency Short-code DSSS Signal Military Communication System Multipath Fading Multiple Access Communication Neural Network Algorithm Noncooperative Context PN Code Estimation PN Sequence Pseudorandom Sequence Radio Link And Equipment Random Sequence Received Signal Signal to Noise Ratio Spread Spectrum Communication Strong Antijamming Capability Synchronisation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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