Jorge Andrés Hernández Carrillo, José Ricardo Cárdenas Valdez, Virgilio Rosendo Pérez, Manuel de Jesús García Ortega, Andrés Calvillo Téllez



This paper proposes the design of a 64-QAM digital modulator on board based on chip technology, the developed board comprises two phase delay and two amplification stages , the modulator was developed using the software PCB Wizard and were established test points for each stage. The developed layout was built through a computer numerical control machine. Experimental results show a significant improvement of the accuracy based on a reached NMSE= -51 dB. The developed board offer a design tool for hardware developers where the intermodulation products can be evaluated, this digital modulator avoid parasitic inductances and capacitances between the lines. The results of the developed system are effective to add white Gaussian noise and probe the intermodulation products up to 3rd order that can be added, as well as the effect of spectral regrowth. The system is a hardware design tool able to show by stages the amplitude and phase changes that involves a 64-QAM modulation.

Keywords: CNC, Intermodulation, Layout, 64-QAM.



Este trabajo propone el diseño de un modulador digital 64-QAM en tarjeta impresa basado en tecnología en chip, la tarjeta desarrollada consta de dos fases de retardo y dos fases de amplificación, el modulador fue desarrollado usando el software PCB Wizard y fueron establecidos puntos de prueba para cada etapa. El diseño desarrollado fue construido a través de una máquina de control numérico por computadora. Los resultados experimentales muestran una mejora significativa en la precisión alcanzada de NMSE de -51 dB. La tarjeta desarrollada ofrece una herramienta de diseño para desarrolladores de hardware donde los productos de intermodulación puedan ser evaluados, este modulador digital evita inductancias parásitas y capacitancias entre líneas. Los resultados del sistema desarrollado son efectivos para agregar ruido blanco Gaussiano y comprobar los los productos de intermodulación de hasta 3er orden que se pueden agregar, así como el efecto de recrecimiento espectral. El sistema es una herramienta de diseño de hardware capaz de mostrar por etapas los cambios en amplitud y fase que involucra una modulación de tipo QAM.

Palabras Claves: CNC, Diseño, Intermodulación, 64-QAM.

Texto completo:

686-698 PDF


ANSI/SCTE, Society of Cable Telecommunications Engineers, ANSI/SCTE 07 2006 Digital Transmission Standard For Cable Television, Engineering Committeee, 2006.

Yan, S. et al., Generation of 64-QAM signals using a single dual-drive IQ modulator driven by 4-level and binary electrical signals, Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, pp. 1-3, Anaheim, USA, March 2013.

Cárdenas-Valdez, J. R., et al., Amplification of 4-, 8-, 16-, 32- and 64-QAM through the Memory Polynomial-Model as Special Case of the Volterra Series Implemented in a RF Satellite Link, in IEEE Ninth Electronics, Robotics and Automotive Mechanics Conference, pp. 349-352, Cuernavaca, Nov. 2012.

Besnoff, J. and Ricketts, D. Quadrature Amplitude Modulated (QAM) Communication Link for Near and Mid-Range RFID Systems, pp. 151-157, San Diego, USA, April 2015.

Chang, C., Li, Y. and Hirata, J. New 64-QAM Golay Complementary Sequences, In IEEE Transactions on Information Theory vol. 56, no. 5, pp. 2479-2485, May 2010.

Correa, R. Performance Analysis Of M-QAM with Viterbi Soft-Decision Decoding, master of science in electrical engineering thesis, Naval Postgraduate School, March 2003.

Gnauck, A. H. et al., Generation and Transmission of 21.4-Gbaud PDM 64-QAM Using a Novel High-Power DAC Driving a Single I/Q Modulator, Journal of Lightwave Technology, vol. 30, no. 4, December 2011.

Kameda, S. et. al., Coverage estimation of uplink 64 QAM signal up to 20 MHz bandwidth based on field trial results: coverage issue of broadband uplink signal, Wireless Personal Multimedia Communications (WPMC), 14th International Symposium on Wireless Personal Multimedia Communications, pp. 1-5, Brest, France, October 2011.

Lee, H. and Golomb, S. W. A new construction of 64-QAM golay complementary sequences, IEEE Transactions on Information Theory, vol. 52, no. 4, pp. 1663-1670, Melbourne, Australia, April 2016.

Oguma, H. et al., Feasibility Study of Uplink Transmission with 64 QAM Based on Results of MBWA System Field Trial, IEEE 5th Broadband Wireless Access Workshop, Hawaii, U.S.A., 2009.

Shin, J. et al., The Implementation of 256 QAM CDMA Modulator, Chapter High-Speed Networks and Multimedia Communications, Lecture Notes in Computer Science, vol. 2720, pp 326-332, 2003.

Vu, X., Duc, N. A. and Vu, T. A. 16-QAM Transmitter and Receiver Design Based on FPGA, Fifth IEEE International Symposium on Electronic Design, Test and Application, pp. 95 – 98, Ho Chi Minh, Vietnam, January 2010.

Enlaces refback

  • No hay ningún enlace refback.