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Wireless Personal Communications
Erschienen in: Wireless Personal Communications 4/2016

01.06.2016

A New Walsh-Like Near Orthogonal (WNO) Sequence for Asynchronous CDMA System

verfasst von: Debolina Chakraborty, Milan Kumar Tarafder, Abhijit Chandra

Erschienen in: Wireless Personal Communications | Ausgabe 4/2016

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Abstract

Present generation mobile communication system employs one of the most popular wireless access technologies called code division multiple access (CDMA). Design of CDMA spreading codes has drawn significant attention amongst the researchers over the last few decades. CDMA code family is generally categorized into purely orthogonal and non-orthogonal (near-orthogonal) members which have established their application in synchronous (downlink) and asynchronous (uplink) CDMA system respectively. Walsh code has been regarded as the most useful spreading code to be used in synchronous link because of its orthogonality property. However, the performance of Walsh code is significantly inferior in asynchronous surroundings. A number of codes have consequently been proposed with an aim to mitigate the shortcomings of Walsh code. This paper makes an innovative attempt to enhance the correlation properties of existing Walsh code through one simple yet powerful algorithm. Proposed code of length ‘N’ has been generated from code sets of length ‘N/4’ and thus makes the code generation algorithm recursive in nature. Performance of the proposed code has subsequently been compared with some existing orthogonal and semi orthogonal codes in terms of various performance metrics and finally the supremacy of our proposition has been established.
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Metadaten
Titel
A New Walsh-Like Near Orthogonal (WNO) Sequence for Asynchronous CDMA System
verfasst von
Debolina Chakraborty
Milan Kumar Tarafder
Abhijit Chandra
Publikationsdatum
01.06.2016
Verlag
Springer US
Erschienen in
Wireless Personal Communications / Ausgabe 4/2016
Print ISSN: 0929-6212
Elektronische ISSN: 1572-834X
DOI
https://doi.org/10.1007/s11277-016-3197-9

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