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Implementation and performance of QAM-level-controlled adaptive modulation for land mobile communications

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3 Author(s)
K. Hamaguchi ; Digital Commun. Sect., Minist. of Posts & Telecommun., Tokyo, Japan ; Y. Kamio ; E. Moriyama

The hardware implementation and performance of an adaptive modulation system in which a suitable level of quadrature amplitude modulation (QAM) is selected for each time slot are reported for land mobile communications. The authors confirm that the system provides a twofold improvement in spectral efficiency compared to a non-adaptive modulation system

Published in:

Electronics Letters  (Volume:33 ,  Issue: 18 )