A Constant Envelope OFDM Signal Generation Algorithm Based on Frequency Domain Noise Shaping

2014 ◽  
Vol 602-605 ◽  
pp. 3156-3159
Author(s):  
Qing Shui Gu ◽  
Chen Wei
Keyword(s):  
Power Amplifier ◽  
Time Domain ◽  
High Efficiency ◽  
Sampling Rate ◽  
Signal Generation ◽  
High Signal ◽  
Noise Shaping ◽  
Sigma Delta Modulation ◽  
Constant Envelope ◽  
Ofdm Signal

Presents a OFDM signal generation method which transforms general OFDM signal to constant envelope signal. Through out-of-band of original OFDM signal insertion synthetic noise signal, the composite signal in time domain is constant envelope, and in in-band can achieve a high signal-to-noise ratio. Simulations show that the method can be used in OFDM system to improve the efficiency of power amplifier. Simulations show that the method does not need too high sampling rate, at the same time there is no stability problems, compared to the high efficiency power amplifier based on time-domain Sigma-Delta modulation technology.

A High Efficiency Class-E Power Amplifier Over a Wide Power Range Using a Look-Up Table Based Dynamic Biasing Scheme

2015 ◽  
Vol E98.C (4) ◽  
pp. 377-379
Author(s):  
Jonggyun LIM ◽  
Wonshil KANG ◽  
Kang-Yoon LEE ◽  
Hyunchul KU
Keyword(s):  
Power Amplifier ◽  
High Efficiency ◽  
Look Up Table ◽  
Dynamic Biasing ◽  
Class E

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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