A new bound and algorithm for star 16-QAM carrier phase estimation

被引：10
作者：
Rice, F [1 ]
Rice, M
Cowley, B
机构：
[1] Univ Adelaide, CSSIP, Adelaide, SA 5005, Australia
[2] DSpace Pty Ltd, Mawson Lakes, SA 5095, Australia
[3] Univ S Australia, Inst Telecommun Res, Mawson Lakes, SA 5095, Australia
来源：
IEEE TRANSACTIONS ON COMMUNICATIONS | 2003年 / 51卷 / 02期
关键词：
Cramer-Rao lower bounds (CRLB); frequency estimation; phase estimation; quadrature amplitude modulation (QAM); synchronization;
D O I：
10.1109/TCOMM.2003.809235
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The true Cramer-Rao lower bound (CRLB) is derived and evaluated for the estimation of carrier phase of Star 16-quadrature amplitude modulation (QAM) and can be simply applied to carrier frequency estimation. Different geometries are investigated by varying the ring ratio (RR). For signal-to-noise ratios (SNRs) between 6-15 dB, the CRLB with RR = 3 is lower than that of Square 16-QAM. A modified phase estimator is presented, which closely follows the new CRLB. Investigation of symbol error performance in short packet length reveals Star 16-QAM to be superior to Square 16-QAM for SNR < 13 dB, which is a reasonable operating range for a coded system. Although Square 16-QAM and Star RR = 1.8 are optimum for a perfect receiver, when the effect of phase estimation is considered, we find Star RR = 3 to be better for SNR below 10 dB.
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页码：161 / 165
页数：5
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