Performance of wavelet based Multi-Chip Rate DS-CDMA signals over multi-path Nakagami-m fading channels

Multi-Chip Rate/Direct Sequence-Code Division Multiple Access (MCR/DS-CDMA) technique using scaled chip waveforms has been designed as an alternative to multi-data rate DS-CDMA techniques having constant chip rates. In this work, the probability of error (Pe) expression for MCR/DS-CDMA signals is derived over multi-path Nakagami-m fading channels to investigate the effects of chip waveforms on it. This paper also proposes the use of orthogonal wavelets as chip waveforms of MCR/DS-CDMA signals over the considered channel. For numerical calculations, Daubechies-22 (D22) wavelet is used because its side lobes are 40 dB below its main lobe in frequency domain. D22 is compared with a Square Root Raised Cosine (SRRC) chip waveform. In the numerical calculations, only first four scales of the chip waveforms relating to four different chip/data rates are considered. The results for the Pe performance and the capacity (the number of user per Hertz for a same P e level) show that D22 significantly outperforms the SRRC chip waveform at all data rates, due to low cross correlations among different scales of orthogonal wavelets. Besides, by increasing the number of scales, the advantage of the use of orthogonal wavelets will increase furthermore. Copyright © 2007 John Wiley & Sons, Ltd.

Dergi Adı Wireless Communications and Mobile Computing
Dergi Cilt Bilgisi 8
Dergi Sayısı 6
Sayfalar 745 - 757
Yayın Yılı 2008
Eser Adı
[dc.title]
Performance of wavelet based Multi-Chip Rate DS-CDMA signals over multi-path Nakagami-m fading channels
Yazar
[dc.contributor.author]
Öztürk E.
Yayın Yılı
[dc.date.issued]
2008
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
Multi-Chip Rate/Direct Sequence-Code Division Multiple Access (MCR/DS-CDMA) technique using scaled chip waveforms has been designed as an alternative to multi-data rate DS-CDMA techniques having constant chip rates. In this work, the probability of error (Pe) expression for MCR/DS-CDMA signals is derived over multi-path Nakagami-m fading channels to investigate the effects of chip waveforms on it. This paper also proposes the use of orthogonal wavelets as chip waveforms of MCR/DS-CDMA signals over the considered channel. For numerical calculations, Daubechies-22 (D22) wavelet is used because its side lobes are 40 dB below its main lobe in frequency domain. D22 is compared with a Square Root Raised Cosine (SRRC) chip waveform. In the numerical calculations, only first four scales of the chip waveforms relating to four different chip/data rates are considered. The results for the Pe performance and the capacity (the number of user per Hertz for a same P e level) show that D22 significantly outperforms the SRRC chip waveform at all data rates, due to low cross correlations among different scales of orthogonal wavelets. Besides, by increasing the number of scales, the advantage of the use of orthogonal wavelets will increase furthermore. Copyright © 2007 John Wiley & Sons, Ltd.
Kayıt Giriş Tarihi
[dc.date.accessioned]
2019-12-23
Açık Erişim Tarihi
[dc.date.available]
2019-12-23
Yayın Dili
[dc.language.iso]
eng
Konu Başlıkları
[dc.subject]
Chip waveform
Konu Başlıkları
[dc.subject]
Daubechies wavelets
Konu Başlıkları
[dc.subject]
Multi-chip rate DS-CDMA
Konu Başlıkları
[dc.subject]
Multi-path fading channels
Konu Başlıkları
[dc.subject]
Performance analysis
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
1530-8669
İlk Sayfa Sayısı
[dc.identifier.startpage]
745
Son Sayfa Sayısı
[dc.identifier.endpage]
757
Dergi Adı
[dc.relation.journal]
Wireless Communications and Mobile Computing
Dergi Sayısı
[dc.identifier.issue]
6
Dergi Cilt Bilgisi
[dc.identifier.volume]
8
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1002/wcm.517
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/6971
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Görüntülenme Sayısı ( Zaman Dağılımı )
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3
09.12.2022 tarihinden bu yana
İndirme
1
09.12.2022 tarihinden bu yana
Son Erişim Tarihi
12 Ocak 2024 14:07
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Tıklayınız
waveforms wavelets orthogonal scales considered numerical calculations number different signals MCR/DS-CDMA waveform Copyright performance results chip/data increase relating (SRRC) Cosine Raised Square furthermore capacity outperforms correlations Besides increasing advantage level) significantly Multi-Chip multi-data derived expression
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