Title :
First implementation of an operating 256 QAM 400 Mb/s microwave radio system
Author :
Kawahara, Hiroyuki ; Murase, Takehiro
Author_Institution :
NTT Network Syst. Dev. Center, Kanagawa, Japan
Abstract :
The design and performance of a 4, 5, 6-GHz, 400-Mb/s microwave radio system are described. The use of a 256-QAM (quadrature amplitude modulation) scheme in the system is discussed. An overall field test has been performed on the system for a 63.5-km overwater route. Results indicate that the outage probability of the 256-QAM system with SD, four-carrier transmission, a transversal equalizer (TRV-EQL), and a cross-polarization interference canceller (XPIC) is within the design objective. Based on these results, a 400-km-long commercial route was constructed and is currently in service
Keywords :
amplitude modulation; digital radio systems; diversity reception; fading; microwave links; 256-QAM scheme; 4 GHz; 400 Mbit/s; 400 km; 5 GHz; 6 GHz; 63.5 km; SHF; commercial route; cross-polarization interference canceller; design; digital radio system; fading probabilities; field test; four-carrier transmission; microwave radio system; outage probability; overwater route; performance; space diversity; transversal equalizer; Bit error rate; Degradation; Error correction codes; Frequency; Interference cancellation; Nonlinear distortion; Polarization; Quadrature amplitude modulation; Repeaters; System testing;
Conference_Titel :
Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-87942-632-2
DOI :
10.1109/GLOCOM.1990.116617
