TRANSCEIVER PLATFORM FOR COMMERCIAL LTE POWER AMPLIFIERS MODELING AND LINEARIZATION (PLATAFORMA DE MODELADO Y LINEALIZACIÓN DE AMPLIFICADORES COMERCIALES CON TRANSCEPTOR RF PARA LTE)
Resumen
In this work, a linearization scheme for QPSK and 64-QAM type digital modulation developed in an RF transceiver is presented. The modeling stage is based on a polynomial memory model with flexible memory depth and non-linearity order. In addition, an indirect learning approach (ILA) scheme is adapted for spectral correction. In this case, a sweep is performed to characterize the commercial RF power amplifier of the AD9316. Experimental results are presented to validate the QPSK with a carrier frequency of 2.4 GHz with a bandwidth of 18 MHz, and for a 64-QAM multiplexed by LTE with a bandwidth of 2.7 MHz. The improvement of the spectral growth of 8 dB for a QPSK signal of 18 MHz and it is demonstrated that it worsens by 2 dB due to the non-linear behavior of the amplifier for an LTE signal with a bandwidth of 2.7 MHz. The developed system is applicable for base stations of femtocells, picocells, and microcells. It represents the starting point of a digital predistortion (DPD) system for medium and high-power RF-PA.
Keywords: 64-QAM, LTE, QPSK, RF-PAs, transceiver.
Resumen
En este trabajo se presenta un esquema de linealización para modulación digital tipo QPSK y 64-QAM desarrollado en un transceptor de RF. La etapa de modelado se basa en un modelo polinomial de memoria con profundidad de memoria flexible y orden de no linealidad, además se adapta un esquema de enfoque de aprendizaje indirecto (ILA) para la corrección espectral. En este caso, se realiza un barrido para caracterizar el amplificador de potencia de RF comercial del AD9316. Se presentan resultados experimentales para validar el QPSK con una frecuencia portadora de 2.4 GHz con un ancho de banda de 18 MHz, y para un 64-QAM multiplexado por LTE con un ancho de banda de 2.7 MHz. Se logra la mejora del recrecimiento espectral de 8 dB para una señal QPSK de 18 MHz y se demuestra como empeora en 2 dB debido al comportamiento no lineal del amplificador para una señal LTE con un ancho de banda de 2.7 MHz. El sistema desarrollado es aplicable para estaciones base de femtocélulas, picocélulas y microcélulas y representa el punto de partida de un sistema de predistorsión digital (DPD) para RF-PA de potencia media y alta.
Palabras Clave: 64-QAM, LTE, QPSK, RF-PAs, transceptor.
Texto completo:
283-299 PDFReferencias
Becerra, J. A., Madero, M. J., Reina, J., & Crespo, C. Sparse Identification of Volterra Models for Power Amplifiers Without Pseudoinverse Computation. IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 11, Noviembre, 2020.
Crespo, C., Madero, M. J., & Becerra, J. A. Volterra-based behavioral modeling, parameter estimation, and linearization. IEEE MTT-S Latin America Microwave Conference (LAMC), Arequipa, Perú, Abril, 2019.
Devi, R. S., & Kurup, D. G. Behavioral modeling of RF power amplifiers for designing energy efficient wireless systems. International Conference on Wireless Communications, Signal Processing and Networking (WiSPNET), Chennai, India, Febrero, 2018.
Franco, I. B., Mendes, L. L., Rodrigues, J., & Cruz, M. 5G Waveforms for IoT Applications. IEEE Communications Surveys and Tutorials, vol. 21, no. 3, pp. 2554 – 2567, abr., 2019.
Galaviz, J. A., Vargas, C., & Tlelo, E. Automated Driving of GaN Chireix Power Amplifier for the Digital Predistortion Linearization. IEEE Transactions on Circuits and Systems II: Express Briefs, Noviembre, 2020.
Huang, H., Xia, J., & Boumaiza, S. Novel Parallel-Processing-Based Hardware Implementation of Baseband Digital Predistorters for Linearizing Wideband 5G Transmitters. IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 9, Septiembre, 2020.
Katz, A., Wood, J., & Chokola, D. The Evolution of PA Linearization: From Classic Feedforward and Feedback Through Analog and Digital Predistortion. IEEE Microwave Magazine, vol. 17, no. 2, pp. 32-40, Febrero, 2016.
Lee, J., Kim, Y., Kwak, Y., Zhang, J., Papasakellariou, A., Novlan, T., Sun, C., & Li, Y. LTE-advanced in 3GPP Rel -13/14: an evolution toward 5G. IEEE Communications Magazine, vol. 54, no. 3, pp. 36-42, Marzo, 2016.
Lie D. Y. C., Mayeda J. C., Li Y., & Lopez J. A Review of 5G Power Amplifier Design at cm-Wave and mm-Wave Frequencies. Wireless Communications and Mobile Computing, Julio, 2018.
Manai, M., Chenini, H., Harguem, A., Boulejfen, N., & Ghannouchi, F. M. Robust digital predistorter for RF power amplifier linearization. IET Microwaves, Antennas and Propagation, vol. 14, no. 7, pp. 649 – 655, Junio, 2020.
Noman M.A., Ullah M. R., Hoque S., & Monirul Md. Design of an improved QPSK modulation technique in wireless communication systems. International Conference on Electrical Information and Communication Technology, Febrero, 2018.
Reina, J., Allegue, M., Crespo, C., Yu, Ch., & Cruces, S. Behavioral Modeling and Predistortion of Power Amplifiers Under Sparsity Hypothesis. IEEE Transactions on Microwave Theory and Techniques, vol. 63, no. 2, pp. 745-753, Febrero, 2015.
Singya, P. K., Kumar, N., & Bhatia, V. Mitigating NLD for Wireless Networks: Effect of Nonlinear Power Amplifiers on Future Wireless Communication Networks. IEEE Microwave Magazine, vol. 18, no. 5, pp. 73-90, Julio, 2017.
Wood, J. Behavioral Modeling and Linearization of RF Power Amplifiers. Artech House, 2014.
URL de la licencia: https://creativecommons.org/licenses/by/3.0/deed.es
Pistas Educativas está bajo la Licencia Creative Commons Atribución 3.0 No portada. 
TECNOLÓGICO NACIONAL DE MÉXICO / INSTITUTO TECNOLÓGICO DE CELAYA
Antonio García Cubas Pte #600 esq. Av. Tecnológico, Celaya, Gto. México
Tel. 461 61 17575 Ext 5450 y 5146
pistaseducativas@itcelaya.edu.mx