一种提高OFDM系统中功率放大器能量效率的自适应极化- qam调制方案

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC) Pub Date : 2016-09-01 DOI:10.1109/PIMRC.2016.7794638

Shulun Zhao, Zhimin Zeng, Chunyan Feng, Fangfang Liu, Yao Nie

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引用次数: 4

摘要

为了提高OFDM系统中功率放大器的能量利用率，考虑发射机端数据速率需求的变化，提出了一种自适应极化- qam调制方案。由于QAM和极化调制分别在功率放大器的线性和非线性区域具有不同的能效性能，因此可以将两种调制方案组合在一起，并自适应地调整调制顺序以满足不同的数据速率要求，从而获得最优的能效。利用功率放大器的功率级数模型，分析了带内畸变和带外发射对OFDM信号的影响。在此基础上，提出的方案可以归结为一个关于输出回退值以及偏振调制和QAM调制顺序的优化问题。在相同码元错误率阈值和数据速率要求下的仿真结果表明，在OFDM系统中，该方案的能量效率是传统QAM方案的近两倍。

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An adaptive polarization-QAM modulation scheme for improving the power amplifier energy efficiency in OFDM systems

To improve the energy efficiency of power amplifier in OFDM systems, an adaptive polarization-QAM modulation scheme is proposed considering the data rate requirement variation at the transmitter. Since QAM and polarization modulation have different energy efficiency performance in the linear and nonlinear region of power amplifier respectively, thus the optimal energy efficiency can be obtained by combining the two modulation schemes together and adjusting their modulation order adaptively to fulfill the varying data rate requirement. The power series model of power amplifier is used to analyze the effects of both the in-band distortions and the out-of-band emissions on OFDM signals. Based on above, the proposed scheme can be formulated as an optimization problem regarding the output back off value as well as the modulation order of polarization modulation and QAM. Simulations under the same symbol error rate threshold and data rate requirement show that, the energy efficiency of the proposed scheme is nearly twice as that of the traditional QAM scheme in OFDM systems.

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来源期刊

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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