PAPR and BER Performances of Direct Spectrum Division Transmission Applied by Clipping and Filtering in ACI Environment

Abstract

Currently, demands for broadband communication are increasing in satellite communications. However, there is a problem that it is difficult to use of frequency bands effectively due to scattered unused bands caused by DAMA (Demand Assigned Multiple Access). In order to solve this problem, DSDT (Direct spectrum division transmission) has been developed. In this scheme, the single carrier modulated signal is finely divided into sub-spectra in the frequency domain on the transmission side and they are allocated to the unused bands over a satellite transponder. Then they are combined on the reception side, and finally the original single carrier modulated signal is recovered. However, there is a problem that the PAPR (Peak-to-average power ratio) increases in direct spectrum division transmission as the number of spectrum division increases. In order to improve the PAPR degradations, we propose a new direct spectrum division transmission applied by clipping and filtering method, which can be easily realized without transmitting the PAPR control information to the receiving side. Moreover, this paper indicates the proposed scheme improves the degradation due to the adjacent channel interference (ACI) from the DSDT spectra applied by clipping. The computer simulation results show that the PAPR performances of the DSDT with clipping and filtering are improved without BER (Bit error rate) degradation by setting the adequate clipping thresholds and adjacent channel interference due to clipping can be reduced by filtering.