scholarly journals Power Amplifier Energy Efficiency Enhancement via Adaptive Polarization-QAM Modulation Scheme in OFDM Systems

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 23751-23763
Author(s):  
Shulun Zhao ◽  
Zhimin Zeng ◽  
Chunyan Feng ◽  
Fangfang Liu
Keyword(s):  
Energy Efficiency ◽  
Power Amplifier ◽  
Modulation Scheme ◽  
Ofdm Systems ◽  
Efficiency Enhancement ◽  
Qam Modulation

Circular 16-QAM modulation scheme for wavelet and Fourier based OFDM systems

Exhibition ◽  
2009 ◽  
Author(s):  
Khaizuran Abdullah ◽  
Noura Al-Hinai ◽  
Amin Z. Sadik ◽  
Zahir M. Hussain
Keyword(s):  
Modulation Scheme ◽  
Ofdm Systems ◽  
Qam Modulation

scholarly journals Performances of BICM-ID system using CRSC code in optical transmissions

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hocine Fekih ◽  
Boubakar Seddik Bouazza ◽  
Keltoum Nouri
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Iterative Decoding ◽  
Optical Transmission ◽  
Coded Modulation ◽  
Modulation Scheme ◽  
Coding Gain ◽  
Decoding Algorithms ◽  
Qam Modulation ◽  
Short Code

AbstractRecently, using iterative decoding algorithms to achieve an interesting bit error rate for spectrally efficient modulation become a necessity for optical transmission, in this paper, we propose a coded modulation scheme based on bit interleaving circular recursive systematic convolutional (CRSC) code and 16-QAM modulation. The proposal system considered as a serial concatenation of a channel encoder, a bit interleaver and M-ary modulator can be flexible easy to implement using a short code length. For a spectral efficiency $\eta =3\text{bit}/s/Hz$, the coding gain at a bit error rate of 10−6 is about 8 dB.

Power efficiency enhancement analysis of an inverse class D power amplifier for NB-IoT applications

2021 ◽  
Author(s):  
Mehrdad Harifi-Mood ◽  
Abolfazl Bijari ◽  
Hossein Alizadeh ◽  
Mehdi Forouzanfar ◽  
Nabeeh Kandalaft
Keyword(s):  
Power Amplifier ◽  
Power Efficiency ◽  
Efficiency Enhancement ◽  
Iot Applications ◽  
Class D
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