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Code-Time Diversity for Direct Sequence Spread Spectrum Systems
Author
Source
Issue
Vol. 2014, Issue 2014 (31 Dec. 2014), pp.1-15, 15 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2014-04-10
Country of Publication
Egypt
No. of Pages
15
Main Subjects
Medicine
Information Technology and Computer Science
Abstract EN
Time diversity is achieved in direct sequence spread spectrum by receiving different faded delayed copies of the transmitted symbols from different uncorrelated channel paths when the transmission signal bandwidth is greater than the coherence bandwidth of the channel.
In this paper, a new time diversity scheme is proposed for spread spectrum systems.
It is called code-time diversity.
In this new scheme, N spreading codes are used to transmit one data symbol over N successive symbols interval.
The diversity order in the proposed scheme equals to the number of the used spreading codes N multiplied by the number of the uncorrelated paths of the channel L.
The paper represents the transmitted signal model.
Two demodulators structures will be proposed based on the received signal models from Rayleigh flat and frequency selective fading channels.
Probability of error in the proposed diversity scheme is also calculated for the same two fading channels.
Finally, simulation results are represented and compared with that of maximal ration combiner (MRC) and multiple-input and multiple-output (MIMO) systems.
American Psychological Association (APA)
Hassan, A. Y.. 2014. Code-Time Diversity for Direct Sequence Spread Spectrum Systems. The Scientific World Journal،Vol. 2014, no. 2014, pp.1-15.
https://search.emarefa.net/detail/BIM-1048468
Modern Language Association (MLA)
Hassan, A. Y.. Code-Time Diversity for Direct Sequence Spread Spectrum Systems. The Scientific World Journal No. 2014 (2014), pp.1-15.
https://search.emarefa.net/detail/BIM-1048468
American Medical Association (AMA)
Hassan, A. Y.. Code-Time Diversity for Direct Sequence Spread Spectrum Systems. The Scientific World Journal. 2014. Vol. 2014, no. 2014, pp.1-15.
https://search.emarefa.net/detail/BIM-1048468
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1048468