A MC-CDMA system based on orthogonal filter banks of wavelet transforms and partial combining
| Autor: | Damoon Shahbaztabar, Shahpour Alirezaee, Ramiyar Heydari, Majid Ahmadi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Minimum mean square error
Computer science Code division multiple access ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS Wavelet transform 020206 networking & telecommunications Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology 03 medical and health sciences 0302 clinical medicine Signal-to-noise ratio Wavelet 0202 electrical engineering electronic engineering information engineering Bit error rate Maximal-ratio combining Fading Electrical and Electronic Engineering Algorithm 030217 neurology & neurosurgery Computer Science::Information Theory |
| Zdroj: | AEU - International Journal of Electronics and Communications. 94:128-138 |
| ISSN: | 1434-8411 |
| Popis: | Multi Carrier Code Division Multiple Access (MC-CDMA) is an appropriate modulation technique for high data rates. In this modulation scheme, employing of combining techniques are unavoidable for restoring orthogonality between different user signals. In this paper, the combining techniques of a MC-CDMA based on wavelet transform are studied. The partial combining of the wavelet based MC-CDMA system is suggested and its performance is compared with the maximum ratio combining (MRC), equal gain combining (EGC), orthogonality restoring combining (ORC) and the minimum mean square error (MMSE) techniques. Orthogonal filter banks of the wavelet transforms provide orthogonality between the wavelets and scaling functions, subcarriers and spreading sequences. Therefore, they provide new dimensions in combatting multipath fading, inter carrier interference (ICI) and narrowband interference in MC-CDMA systems. Furthermore, analysis of partial combining shows that coefficients of this technique can be computed in a simple manner. Simulations results indicate that the bit error rate (BER) performance of the proposed scheme is almost comparable with the MMSE combining scheme and the proposed system has a proper performance in terms of BER versus the signal to noise ratio (SNR) in frequency selective fading channels. |
| Databáze: | OpenAIRE |
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