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Throughput Comparisons of 32/64APSK Schemes Based on Mutual Information Considering Cubic Metric
Reo KOBAYASHI Teruo KAWAMURA Nobuhiko MIKI Mamoru SAWAHASHI
Publication
IEICE TRANSACTIONS on Communications
Vol.E95B
No.12
pp.37193727 Publication Date: 2012/12/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E95.B.3719
Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Section on Coding and Coding TheoryBased Signal Processing for Wireless Communications) Category: Keyword: APSK, throughput, mutual information, cubic metric,
Full Text: PDF>>
Summary:
This paper presents comprehensive comparisons of the achievable throughput between the 32/64ary amplitude and phase shift keying (APSK) and cross 32QAM/square 64QAM schemes based on mutual information (MI) considering the peaktoaverage power ratio (PAPR) of the modulated signal. As a PAPR criterion, we use a cubic metric (CM) that directly corresponds to the transmission backoff of a power amplifier. In the analysis, we present the best ring ratio for the 32 or 64APSK scheme from the viewpoint of minimizing the required received signaltonoise power ratio (SNR) considering the CM that achieves the peak throughput, i.e., maximum errorfree transmission rate. We show that the required received SNR considering the CM at the peak throughput is minimized with the number of rings of M = 3 and 4 for 32ary APSK and 64asry APSK, respectively. Then, we show with the best ring ratios that the (4, 12, 16) 32APSK scheme with M = 3 achieves a lower required received SNR considering the CM compared to that for the cross 32QAM scheme. Similarly, we show that the (4, 12, 20, 28) 64APSK scheme with M = 4 achieves almost the same required received SNR considering the CM as that for the square 64QAM scheme.

