Title :
A common control broadband combiner for full frequency band non-regenerative repeating digital microwave radio systems
Author :
Kagami, Osamu ; Watanabe, Kazuji ; Satoh, Akio ; Yosnida, T.
Author_Institution :
NTT Wireless Syst. Lab., Kanagawa, Japan
Abstract :
A common control broadband (CCB) combiner is one of the key devices involved in the development of full frequency band non-regenerative repeating digital microwave radio systems. The CCB combiner must combine two received signals at a frequency bandwidth of 280 MHz. To develop such a combiner, broadband signal transmission characteristics caused by multipath fading are analyzed, a multi-ray model is developed, and propagation parameters for paths over the sea, flat plains and mountainous areas are determined. This paper describes such a combiner. By using the above-mentioned model and parameters, the improvement on fading effected by this combiner with an optimum combining method is calculated and confirmed by experiment. The calculation verifies this combiner can be effectively applied to transmissions over flat plains and mountainous areas. The suitability of the combining method and the calculation method used is also demonstrated experimentally
Keywords :
digital radio; fading; microwave links; microwave measurement; microwave propagation; multipath channels; radio repeaters; telecommunication control; 280 MHz; broadband signal transmission; common control broadband combiner; digital microwave radio systems; experiment; flat plains; frequency bandwidth; full frequency band non-regenerative repeater; mountainous areas; multi-ray model; multipath fading; optimum combining method; propagation parameters; received signals; sea; Bandwidth; Control systems; Fading; Microwave devices; RF signals; Radio control; Radio frequency; Repeaters; Signal analysis; Synchronous digital hierarchy;
Conference_Titel :
Global Telecommunications Conference, 1994. GLOBECOM '94. Communications: The Global Bridge., IEEE
Print_ISBN :
0-7803-1820-X
DOI :
10.1109/GLOCOM.1994.513553