USTLD mapper design for APSK constellations over satellite links
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Wiley
Abstract
Space-time block code (STBC)–based multiple-input–multiple-output techniques have been considered recently to enhance the performance of mobile
satellite communication systems in terms of link reliability. Uncoded space-time
labelling diversity (USTLD) is a diversity technique that is a direct extension
of the STBC system and further improves its performance. A USTLD system is
proposed in this paper that is designed specifically for satellite to mobile station
links. The circular M-ary Amplitude Phase-Shift Keying (MAPSK) constellation,
which is adopted by the most recent satellite broadcasting standard Digital Video
Broadcasting standard for nonlinear satellite links (DVB-S2X), is applied to the
USTLD system. The most critical aspect of developing a USTLD system is the
design of the secondary mapper to achieve labelling diversity. Existing square
M-ary Quadrature Amplitude Modulation (MQAM) approaches to USTLD mapper design are adapted for appropriate 16APSK and 64APSK constellations from
the DVB-S2X standard. Various metrics are derived to quantitatively compare
mapper designs for a Nakagami-q fading channel. Theoretical results, verified
by Monte Carlo simulations, show that the best of the MAPSK USTLD mappers considered achieve a gain of approximately 4 dB for 16APSK and 5 dB for
64APSK when compared to the Alamouti STBC system. Furthermore, a study
is conducted to analytically compare USTLD mappers using the derived metrics
for both MQAM and MAPSK. It is concluded that a two-stage approach is the
most accurate methodology for comparing USTLD mapper designs.
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Citation
Quazi, T. and Patel, S.S. 2019. USTLD mapper design for APSK constellations over satellite links. Transactions on Emerging Telecommunications Technologies. 30(7):1-13. doi:10.1002/ett.3586
DOI
10.1002/ett.3586