Mathematical Model and Reference Frequency Optimization for Digital Dual-Band Pulsewidth Modulation

In all-digital transmitter (ADT), pulsewidth modulation (PWM) is a popular pulse coding technique. This paper makes research on the PWM technique for dual-band ADT. Firstly, the mathematical model of the dual-band PWM signal is derived and then the frequency components of the modulated signal are an...

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Bibliographic Details
Published in:2020 IEEE MTT-S International Wireless Symposium (IWS) pp. 1 - 3
Main Authors: Chen, Zihao, Yang, Jun, Zhang, Xiuyin, Bai, Jinliang, Feng, Tianjian, Tang, Jie, Chen, Guanhong, Jiang, Zepeng
Format: Conference Proceeding
Language:English
Published: IEEE 20.09.2020
Subjects:
Dual band
Frequency modulation
mathematical expression
Mathematical model
optimal reference frequency
Optimization
Pulse width modulation
pulsewidth modulation (PWM)
Simulation
Wireless communication
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Summary:In all-digital transmitter (ADT), pulsewidth modulation (PWM) is a popular pulse coding technique. This paper makes research on the PWM technique for dual-band ADT. Firstly, the mathematical model of the dual-band PWM signal is derived and then the frequency components of the modulated signal are analyzed. Based on the analysis, an algorithm is designed to find the optimal reference frequency to improve the quality of the modulated signal. The simulation results validate the effectiveness of the mathematical model. In addition, with the optimal reference frequency, the spurious-free bandwidths are significantly improved, and the maximum improvement of error vector magnitude (EVM) is 5.4353%.
DOI:10.1109/IWS49314.2020.9359934