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Design and Performances of a 200 Mbit/s 16 QAM Digital Radio System

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3 Author(s)
I. Horikawa ; Nippon Telegraph and Telephone Public Corp., Japan ; T. Murase ; Y. Saito

A novel long haul 5 GHz 16 QAM digital radio system, which has 200 Mbit/s transmission capacity within the 40 MHz interleaved channel allocation, is proposed and described. It is designed to be overbuilt on existing FDM-FM routes with an approximately 50 km repeater spacing. To achieve the 5 bit/s/Hz RF spectral efficiency, the 16 QAM modulation and Nyquist cosine roll-off spectral shaping techniques ( \alpha = 0.5 ) are investigated. Then a new signal shaping filter, differential encoding and carrier recovery techniques are presented. Finally, the effects of TWT amplifier nonlinearity on a 16 QAM signal are experimentally investigated.

Published in:

IEEE Transactions on Communications  (Volume:27 ,  Issue: 12 )