WSEAS Transactions on Communications
Print ISSN: 1109-2742, E-ISSN: 2224-2864
Volume 13, 2014
Performance Enhancement of VSAT MC-CDMA System Using Channel Coding Techniques and Predistortion over Rayleigh Channel
Authors: , , ,
Abstract: In this paper, the performance of VSAT network, in uplink (earth station to a geostationary satellite) and Ku-band have been examined over Rayleigh channel. The most popular type of multiple access schemes: Code Division Multiple Access (CDMA) combined with the multi-carrier transmission system OFDM is used in this study, in order to obtain a densification of data traffic on the network and achieve a high data rate. To improve the performance of the envisaged system, and get a very low bit error rate, we proposed the use of strategies allowing the correction of errors induced by the imperfections of the communication channel. Channel coding techniques used in this study are (LDPC codes, Turbo codes and convolutional codes). In the simulation results, we have demonstrated the effectiveness of each coding strategy in our communication system. The integration of LDPC coding in our transmission chain has provided a significant gain compared to other encoding schemes, and the bit error rate (BER) has reached a satisfying level at a low energy per bit to noise power spectral density ratio (Eb/No). To compensate the effect of the non-linearity of the High Power Amplifier HPA, a predistortion technique is adopted to further improve performance of the envisaged system.
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Pages: 318-328
WSEAS Transactions on Communications, ISSN / E-ISSN: 1109-2742 / 2224-2864, Volume 13, 2014, Art. #35