移动wimax中使用包络跟踪(ET)和SiGe功率放大器的极性发射机的降峰技术

2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems Pub Date : 2009-11-01 DOI:10.1109/COMCAS.2009.5386015

Yan Li, Dongri Meng, Jerry Lopez, D. Lie, Kevin Chen, Stanley Wu, T. Yang

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引用次数: 4

摘要

针对采用包络跟踪(ET)和单片SiGe功率放大器(PA)的极性发射机(TX)，提出了一种基于时域裁剪和滤波的移动WiMAX降噪算法。对64 QAM OFDM调制格式的移动WiMAX进行了射频/模拟/数字系统和电路协同设计仿真。研究发现，较高的功率平均比(PAR)降低可以提高相邻信道功率比(ACPR)和TX系统的整体效率，但代价是其EVM退化。我们的系统仿真表明，仔细的信号衰减设计可以将整体极性TX系统效率从28.1%提高到30.3%，而TX输出仍然可以满足严格的WiMAX TX掩模和EVM规范。

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A de-cresting technique for polar transmitters using Envelope-Tracking (ET) and SiGe power amplifiers for mobile-WiMAX

A decresting algorithm for mobile WiMAX has been developed using time domain clipping and filtering processes for a polar transmitter (TX) using Envelope-Tracking (ET) and a monolithic SiGe power amplifier (PA). RF/Analog/Digital system and circuits co-design simulations have been performed for mobile WiMAX with 64 QAM OFDM modulation format. It is found that higher power-to-average ratio (PAR) decresting can improve the adjacent channel power ratio (ACPR) and the overall TX system efficiency, but at the cost of its EVM degradation. Our system simulations show that careful design of signal decresting can improve the overall polar TX system efficiency from 28.1% to 30.3% while the TX output can still meet the stringent WiMAX TX mask and EVM specs.

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来源期刊

2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems

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