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Study of code division multiple access (cdma) technique for mobile communication systems_Sairee Sainel

Study of code division multiple access (cdma) technique for mobile communication systems_ Sairee Sainel_E3_2005_NI
Projek ini mempersembahkan teknologi CDMA untuk sistem rangkaian telefon bimbit. Objektif projek ini adalah memahami teknik-teknik spektrum rebak termasuk DS-CDMA dan juga menerangkan sistem IS-95A. Keputusan ujian simulasi ke atas IS-95A saluran trafik songsang juga disertakan untuk menilai prestasi saluran. Beberapa kaedah dilaksanakan ke atas sistem untuk mencari kaedah terbaik untuk prestasi sistem tersebut iaitu dengan mengubah kadar data, frekuensi anjakkan Doppler dan juga kadar isyarat ke hingar (SNR). Prestasi ini dinilai dengan jumlah BER. Frekuensi anjakkan Doppler yang digunakan diubah untuk mengira BER yang minimum. Didapati bahawa prestasi sistem juga berubah dengan perubahan kadar data. Jumlah AWGN yang ditambah kedalam sistem adalah bagi mewakili isyarat yang terjana dari gangguan luar oleh antenna berdekatan yang turut menggunakan frekuensi yang sama. Maka dengan mengubah SNR didalam saluran AWGN akan memberi kesan ke atas prestasi sistem. Secara keseluruhannya, dengan meningkatkan SNR akan turut meningkatkan prestasi sistem perhubungan tersebut. ___________________________________________________________________________________ This report presents details study of CDMA technique for mobile communication systems. The objective of this project is to understand the spread spectrum techniques including DS-CDMA and also to explain IS-95A system. The test results for simulation on the IS-95A Reverse traffic channel are included to evaluate the performance of the channel under various traffic conditions. Various conditions are applied to the system to decide on the best performance. The performance of the channel was measured in terms of BER. Reasonable Doppler shift frequency is determined. It is found that performance of the system vary with the reduced of data rate. Amount of AWGN added to the signal represents the interference generated by other base station nearer. Therefore changes of SNR in the AWGN Channel provoke the system performance. The detection performance improves with an increase in the SNR.
Contributor(s):
Sairee Sainel - Author
Primary Item Type:
Final Year Project
Language:
English
Subject Keywords:
for mobile ; communication ; spectrum
First presented to the public:
3/1/2005
Original Publication Date:
2/26/2020
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Electrical & Electronic Engineering
Citation:
Extents:
Number of Pages - 66
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2020-02-26 15:18:55.262
Submitter:
Nor Hayati Ismail

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