Comprehensive Feasibility Study on Direct Spectrum Division Transmission over Multiple Satellite Transponders

Fumihiro YAMASHITA  Daisuke GOTO  Yasuyoshi KOJIMA  Jun-ichi ABE  Takeshi ONIZAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E104-B    No.4    pp.446-454
Publication Date: 2021/04/01
Publicized: 2020/10/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2020EBP3058
Type of Manuscript: PAPER
Category: Satellite Communications
Keyword: 
satellite communications,  direct spectrum division transmission,  satellite transponders,  auto gain control,  

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Summary: 
We have developed a direct spectrum division transmission (DSDT) technique that can divide a single-carrier signal into multiple sub-spectra and assign them to dispersed frequency resources of the satellite transponder to improve the spectrum efficiency of the whole system. This paper summarizes the satellite experiments on DSDT over a single and/or multiple satellite transponders, while changing various parameters such as modulation schemes, roll-off ratios, and symbol rates. In addition, by considering practical use conditions, we present an evaluation of the performance when the spectral density of each sub-spectrum differed across transponders. The satellite experiments demonstrate that applying the proposal does not degrade the bit error rate (BER) performance. Thus, the DSDT technique is a practical approach to use the scattered unused frequency resources over not only a single transponder but also multiple ones.