scholarly journals Power Efficiency Improvements through Peak-to-Average Power Ratio Reduction and Power Amplifier Linearization

2007 ◽  
Vol 2007 (1) ◽  
Author(s):  
Ning Chen ◽  
G. Tong Zhou ◽  
Hua Qian
Keyword(s):  
Power Amplifier ◽  
Power Efficiency ◽  
Average Power ◽  
Power Ratio ◽  
Amplifier Linearization ◽  
Power Ratio Reduction ◽  
Ratio Reduction

scholarly journals Machine-Learning Assisted Optimisation of Free-Parameters of a Dual-Input Power Amplifier for Wideband Applications

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2831
Author(s):  
Teng Wang ◽  
Wantao Li ◽  
Roberto Quaglia ◽  
Pere L. Gilabert
Keyword(s):  
Power Amplifier ◽  
Power Efficiency ◽  
Average Power ◽  
Long Term Evolution ◽  
Input Power ◽  
Global Optimisation ◽  
Power Ratio ◽  
Term Evolution ◽  
Free Parameters

This paper presents an auto-tuning approach for dual-input power amplifiers using a combination of global optimisation search algorithms and adaptive linearisation in the optimisation of a multiple-input power amplifier. The objective is to exploit the extra degrees of freedom provided by dual-input topologies to enhance the power efficiency figures along wide signal bandwidths and high peak-to-average power ratio values, while being compliant with the linearity requirements. By using heuristic search global optimisation algorithms, such as the simulated annealing or the adaptive Lipschitz Optimisation, it is possible to find the best parameter configuration for PA biasing, signal calibration, and digital predistortion linearisation to help mitigating the inherent trade-off between linearity and power efficiency. Experimental results using a load-modulated balanced amplifier as device-under-test showed that after properly tuning the selected free-parameters it was possible to maximise the power efficiency when considering long-term evolution signals with different bandwidths. For example, a carrier aggregated a long-term evolution signal with up to 200 MHz instantaneous bandwidth and a peak-to-average power ratio greater than 10 dB, and was amplified with a mean output power around 33 dBm and 22.2% of mean power efficiency while meeting the in-band (error vector magnitude lower than 1%) and out-of-band (adjacent channel leakage ratio lower than −45 dBc) linearity requirements.

scholarly journals Peak-to-average power ratio reduction based on Cross-Correlation in OFDM systems

2014 ◽  
Author(s):  
Mohsen Kazemian ◽  
Pooria Varahram ◽  
Shaiful Jahari B. Hashim ◽  
Borhanuddin B. Mohd. Ali ◽  
Somayeh Mohammady ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Average Power ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Power Ratio Reduction ◽  
Ratio Reduction
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