The paper shows the structure of the modulator and demodulator of the proposed system.
A.Y. Hassan 2018, 'Increasing the symbol rate in QAM system using a new set of orthonormal basics functions',Journal of Electrical Systems and Information Technologyhttp://www.sciencedirect.com/science/article/pii/S2314717217300260. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The system consists of carefully designed precise voltage-controlled current source, biopotential recorder, and demodulator.
Hassan Yazdanian, Amin Mahnam, Mehdi Edrisi, Morteza Abdar Esfahani 2016, 'Design and implementation of a portable impedance cardiography system for noninvasivestroke volume monitoring', Journal of Medical Signals and Sensorshttp://www.jmss.mui.ac.ir/article.asp?issn=2228-7477;year=2016;volume=6;issue=1;spage=47;epage=56;aulast=Yazdanian. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The receiver was co-simulated with the dual band non coherent demodulator.
Mouna Bettaieb, Saif Benali, Ghazi Bouzid, Hatem Trabelsi 2018, 'A Novel MICS Receiver with FSK Dual Band Demodulator', Advances in Science, Technology and Engineering Systemshttps://astesj.com/v03/i05/p09/. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The demodulator circuit consists of a comparator designed with a preset offset voltage.
Mayukh Bhattacharyya, Waldemar Gruenwald, Dirk Jansen, Leonhard Reindl, Jasmin Aghassi-Hagmann 2018, 'An Ultra-Low-Power RFID/NFC Frontend IC Using 0.18 μm CMOS Technology for PassiveTag Applications', Sensorshttp://www.mdpi.com/1424-8220/18/5/1452. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
In this paper the proposed group of hybrid modulations and proposed hybrid modulator and demodulator are presented.
I. Vertat, J. Mraz 2013, 'Hybrid M-FSK/DQPSK Modulations for CubeSat Picosatellites', Radioengineeringwww.radioeng.cz/fulltexts/2013/13_01_0389_0393.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Experimental results under different channel conditions show that the proposed demodulator has good adaptability to frequency offset and short latency.
Yan Liu, Yue Shen, Li Li, Hai Wang 2018, 'FPGA Implementation of a BPSK 1D-CNN Demodulator', Applied Scienceshttp://www.mdpi.com/2076-3417/8/3/441. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
This new algorithm can not only simplify the signal processing stage but also decouple the demodulator and carrier synchronization module.
Y. Liu, C. Tao 2010, 'Feedback Compensation Algorithm for BPSK/QPSK Carrier Synchronization', Radioengineeringwww.radioeng.cz/fulltexts/2010/10_01_149_154.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)