Throughput Comparisons of Star 32/64 QAM Schemes Based on Mutual Information Considering Cubic Metric
This paper presents comparisons of the achievable throughput between the star 32/64QAM and square 32/64QAM schemes based on mutual information (MI) considering the peak-toaverage power ratio (PAPR) of the modulated signal. As a PAPR criterion, we use a cubic metric (CM) that directly corresponds to the transmission back-off of a power amplifier. In the analysis, we present the best ring ratio for the star 32 or 64QAM scheme from the viewpoint of minimizing the required received signal-tonoise power ratio (SNR) considering the CM that achieves the peak throughput, i.e., maximum error-free 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 star 32QAM and star 64QAM, respectively. Then, we show with the best ring ratios, that the (4, 12, 16) star 32QAM scheme with M = 3 achieves a lower required received SNR considering the CM compared to that for the square 32QAM scheme. Similarly, we show that the (4, 12, 20, 28) star 64QAM scheme with M = 4 achieves almost the same required received SNR considering the CM as that for the square 64QAM scheme.
QAM throughput cubic metric mutual information
Reo Kobayashi Teruo Kawamura Nobuhiko Miki Mamoru Sawahashi
Department of Information Network Engineering, Tokyo City University Radio Access Network Development Department, NTT DOCOMO, INC. Research Laboratories, NTT DOCOMO, INC.
国际会议
南京
英文
1-5
2011-11-09（万方平台首次上网日期，不代表论文的发表时间）