DocumentCode :
756155
Title :
Design and Performances of a 200 Mbit/s 16 QAM Digital Radio System
Author :
Horikawa, Izumi ; Murase, Takehiro ; Saito, Yoichi
Author_Institution :
Nippon Telegraph and Telephone Public Corp., Japan
Volume :
27
Issue :
12
fYear :
1979
fDate :
12/1/1979 12:00:00 AM
Firstpage :
1953
Lastpage :
1958
Abstract :
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 ( 
) 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.
) 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.Keywords :
APK communication; Microwave radio communication; Channel allocation; Communication networks; Digital communication; Microwave filters; Modems; Phase shift keying; Quadrature amplitude modulation; Radio frequency; Radiofrequency amplifiers; Repeaters;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1979.1094362
Filename :
1094362
Link To Document :
