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141414

Estimation of Multipath Fading in DS-CDMA Systems.

Article

Last updated: 22 Jan 2023

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Electrical Engineering

Abstract

In DS-CDMA receivers, the synchronization error between the received signal and the generated code is about one chip duration in Interim Specification 95 (IS-95) system. This error makes the correlator to produce the peak of the 1st arrival multipath signal away from its position up to about 800 ns. This small error in time leads to severe mistakes especially in positioning applications. So, the delayed versions of the code sequence with delay less than one chip duration need to be defined. In this paper, the multipaths with delays less than one chip duration are modeled as tapped- delay line model. A Kalman filter algorithm is applied to estimate the tap coefficients under the situation of known channel statistics. The tap coefficient higher than 0.5means that its corresponding path is an effective path. In case of more than one effective path, the algorithm gives a weight higher than 0.5 only for the path with the smallest delay. This is sufficient, since the reception timing reference is at the 154 arrival signal peak. The simulations (real different cases applied to 3 - pach and 5 path models at low and high SNRs. The results show that the algorithm works well in the different considered situations.

DOI

10.21608/bfemu.2003.141414

Keywords

Kalman filter, DS-CDMA. multipath fading, tapped-delay- line model

Authors

First Name

Mohamed

Last Name

Abou El-Seoud

MiddleName

-

Affiliation

Electrical Engineering Department., Faculty of Engineering at Port Said., Suez Canal University.

Email

-

City

-

Orcid

-

First Name

Atef

Last Name

Ghuneim

MiddleName

M.

Affiliation

Electrical Engineering Department., Faculty of Engineering at Port Sai., Suez Canal University.

Email

-

City

-

Orcid

-

First Name

Mohamed

Last Name

El-Dakiki

MiddleName

-

Affiliation

Electrical Engineering Department., Faculty of Engineering at Port Said., Suez Canal University.

Email

-

City

-

Orcid

-

First Name

Heba

Last Name

Soliman

MiddleName

Y. M.

Affiliation

Electrical Engineering Department., Faculty of Engineering at Port Said., Suez Canal University.

Email

-

City

-

Orcid

-

Volume

28

Article Issue

3

Related Issue

20837

Issue Date

2003-09-01

Receive Date

2003-06-19

Publish Date

2021-09-01

Page Start

1

Page End

12

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 28_Issue 3_Pages 1-12.pdf

PDF . 294.1kB

Link

https://bfemu.journals.ekb.eg/article_141414.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=141414

Order

1

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

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Article

Created At

22 Jan 2023