TRANSMISSION POWER-CONTROL EFFECTS FOR QUASI-MILLIMETER MICROWAVE ACCESS SYSTEMS

In the quasi-millimeter radio access system, the links are installed r adially from the central station (CS) to the outstation (OS). Therefor e, the interference characteristics of the CS are deteriorated at the time of rain. This paper proposes a transmission power control method with a view to reducing the deterioration of the interference characte ristics at the CS in rain. The effect of compensation of the level rat io of a desired wave to an undesired wave (D/U) degradation at the CS in the rain can be reduced by 11.5 dB by the transmission power contro l (TPC) of 20 dB. Further, the speed of the rain attenuation was found which is a propagation parameter needed for the TPC. The trailing spe ed of the rain attenuation in the proposed TPC algorithm is 67 dB/s, w hich is much larger than the maximum speed of the 3 dB/s of the rain a ttenuation. Hence, the proposed TPC algorithm can sufficiently follow the rain attenuation.