Title :
A new combiner for multi-antenna diversity in multi-carrier microwave radio systems
Author :
Ichikawa, Hirofumi ; Nakamura, Toshio
Author_Institution :
NTT Network Syst. Dev. Center, Kanagawa, Japan
Abstract :
A novel combiner for multiantenna diversity in a multicarrier digital microwave radio is described. To improve the control accuracy and dynamic response to fading, an individual in-phase space diversity (SD) combine method and a digitally controlled phase detecting method is proposed. The required phase control speed becomes about 1000°/sec assuming a two-ray fading model, and the proposed combiner can follow such a high-speed fading. The circuit can also be made up of LSIs. In a field examination of 256QAM (quadrature amplitude modulation) transmission, an individual in-phase SD was evaluated and showed remarkable improvement in reducing outages caused by multipath fading
Keywords :
antenna accessories; digital radio systems; diversity reception; fading; large scale integration; microwave links; receiving antennas; 256QAM; LSI; combiner; control accuracy; digitally controlled phase detecting method; dynamic response; high-speed fading; in-phase space diversity; multiantenna diversity; multicarrier digital microwave radio; multipath fading; outage reduction; phase control; quadrature amplitude modulation; two-ray fading model; Bandwidth; Circuits; Fading; Frequency response; Intelligent networks; Interference; Microwave antennas; Passband; Phase control; Receiving antennas;
Conference_Titel :
Communications, 1991. ICC '91, Conference Record. IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0006-8
DOI :
10.1109/ICC.1991.162353
