衰落信道中星座密度对栅格编码调制的影响

[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI:10.1109/VETEC.1992.245354

P. Ho, J. Cavers, J. Varaldi

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引用次数: 7

摘要

有些人不愿意在移动通信中使用像16cam这样的密集星座，因为它们的峰值与平均功率比更高，而且对噪声和信道干扰似乎更敏感。事实证明，密集的星座实际上可以提高性能。采用完全解析的方法，比较了三种具有相同2比特/符号净吞吐量的星座:未编码QPSK，速率2/3 TCM 8-PSK和速率1/2 TCM 16 QAM。在平均功率的基础上比较，TCM 16-QAM比TCM 8-PSK领先5db。即使在峰值功率的基础上进行比较，TCM 16-QAM也比TCM 8-PSK有2.44 db的优势。QPSK比两者都差得多。

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The effect of constellation density on trellis coded modulation in fading channels

There has been some reluctance to use dense constellations such as 16 CAM for mobile communications because of their greater peak-to-average-power ratio and their seemingly greater sensitivity to noise and channel interference. It is demonstrated that dense constellations can actually improve performance. Using a completely analytical method, three constellations are compared with the same net throughput of 2 bits/symbol: uncoded QPSK, rate 2/3 TCM 8-PSK, and rate 1/2 TCM 16 QAM. Comparison on the basis of average power puts TCM 16-QAM 5-dB ahead of TCM 8-PSK. Even comparison on the basis of peak power gives TCM 16-QAM a 2.44-dB advantage over TCM 8-PSK. QPSK is much poorer than either.<>

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[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology

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