Long baseline weak-thermal-light interferometry with noiseless linear amplification

2015 ◽  
Vol 32 (6) ◽  
pp. 1031 ◽  
Author(s):  
Song Yang ◽  
XuBo Zou ◽  
GuangCan Guo ◽  
NingJuan Ruan ◽  
XuLing Lin ◽  
...  
Keyword(s):  
Linear Amplification ◽  
Long Baseline ◽  
Thermal Light

Measurements of radio telescope receiving system noise temperatures of two-elements radio interferometer with very long baseline

2018 ◽  
pp. 51-54
Author(s):  
I. E. Arsaev ◽  
Yu. V. Vekshin ◽  
A. I. Lapshin ◽  
V. V. Mardyshkin ◽  
M. V. Sargsyan ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Radio Interferometer ◽  
System Noise ◽  
Long Baseline

The Dynamic Measurement for Long Baseline of InSAR Based on Distance Constraint

2013 ◽  
Vol 34 (7) ◽  
pp. 1589-1595
Author(s):  
Jing Wang ◽  
Mao-sheng Xiang ◽  
Li-deng Wei ◽  
Hai-liang Wang ◽  
Xi-rui Sun ◽  
...  
Keyword(s):  
Dynamic Measurement ◽  
Distance Constraint ◽  
Long Baseline

Improvement of Carrier Power to Third-Order Intermodulation Distortion Power Ratio for a Power Amplifier at 5.25 GHz using LINC Method

2018 ◽  
Vol 12 (1) ◽  
pp. 34-40
Author(s):  
Said Elkhaldi ◽  
Naima Amar Touhami ◽  
Mohamed Aghoutane ◽  
Taj-eddin Elhamadi
Keyword(s):  
Power Amplifier ◽  
Artificial Neural Network Model ◽  
Power Ratio ◽  
Linear Amplification ◽  
Third Order ◽  
Gaas Mesfet ◽  
Constant Envelope ◽  
Modulation Signal ◽  
Low Efficiency ◽  
Nonlinear Components

Introduction:This paper focuses on improving the power amplifier linearity for wireless communications. The use of a single branch of a power amplifier can produce high distortion with low efficiency.Method:In this paper, the Linear Amplification with Nonlinear Components (LINC) technique is used to improve the linearity and efficiency of the power amplifier. The LINC technique is based on converting the envelope modulation signal into two constant envelope phase-modulated baseband signals. After amplification and combining the resulting signals, the required linear output signal is obtained. To validate the proposed approach, LINC technique is used for linearizing an amplifier based on a GaAs MESFET (described by an artificial neural network Model).Conclusion:Good results have been achieved, and an improvement of about 40.80 dBc and 47.50 dBc respectively is obtained for the Δlower C/I and Δupper C/I at 5.25 GHz.

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