Abstract
With the increasing demand for increased coverage area, higher QoS, ubiquitous availability, flexibility and expandability, Land Mobile Satellite (LMS) multimedia communication is gaining popularity over existing Land Mobile Terrestrial (LMT) communication. This paper presents a comparative study of GO-OFDMA and VSL MC-CDMA variable rate transmission scheme over L and Ka-band LMS channel. For both the schemes, four variable rate classes employing 15 users are considered. It is shown that, for both the frequency bands, the BER performance of GO-OFDMA scheme is better than that of VSL MC-CDMA for all the different data rate class of users. Though, for Ka-band, the performance of both the schemes is relatively poor than L-band. Also, the performance of both the schemes for different elevation angles are illustrated and analyzed. Later, the composite signal PAPR performance of both the transmission schemes is shown and compared. It is observed that, the PAPR performance of GO-OFDMA scheme is better than VSL MC-CDMA. Hence GO-OFDMA scheme is a suitable candidate for variable rate communication over LMS channel.
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