Title :
A non-regenerative repeating digital microwave radio system
Author :
Watanabe, Kazuji ; Ohtsuka, Hiroyuki ; Kagami, Osamu
Author_Institution :
NTT Radio Commun. Syst. Lab., Kanagawa, Japan
Abstract :
The authors present a nonregenerative repeating system using digital quadrature amplitude modulation (QAM) signals. The difference in cumulative degradation characteristics between regenerative and nongenerative repeating systems is discussed. In addition, the bit error rate performance of a repeater transmission is presented using 16-QAM signals at a 12.5-Mb/s transmission rate. Multirelay degradation factors and countermeasures against interference noise are considered, which are self-interference passing adjacent channels and cross-polarization interference. Calculated and experimental results using adjacent 16-QAM signals and dual-polarization 256-QAM signals are presented
Keywords :
amplitude modulation; digital radio systems; error statistics; interference suppression; intersymbol interference; microwave links; radiofrequency interference; repeaters; 12.5 Mbit/s; adjacent 16-QAM signals; bit error rate performance; cross-polarization interference; cumulative degradation characteristics; digital microwave radio system; digital quadrature amplitude modulation; dual-polarization 256-QAM signals; multirelay degradation factors; nonregenerative repeating system; self-interference; Bit error rate; Fading; Interference cancellation; Intersymbol interference; Modems; Polarization; Quadrature amplitude modulation; Repeaters; Synchronous digital hierarchy; Thermal degradation;
Conference_Titel :
Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-87942-697-7
DOI :
10.1109/GLOCOM.1991.188675
