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Digital Modulation/Demodulation Techniques for Mobile Radio Communications in Japan
IEICE TRANSACTIONS on Communications
Publication Date: 1991/06/25
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Issue on Mobile Communications)
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This paper introduces the research and development of digital modulation/demodulation techniques for mobile radio communications carried out so far in Japan. Constant envelope modulations such as GMSK, Nyquist filtered multilevel FM, PLL-QPSK and CCPSK are described. Linear modulations including π/4 shift QPSK, 16 QAM, anti-multipath modulations and nonlinearity compensated transmitter power amplifier are presented. The paper shows that Japan has made a significant contribution to the evolution of new technologies in this field.