移動通信の将来と基盤技術 : 周波数資源の有効利用を目指して

Abstract

With advances and diversification in the private and business sectors of society, the use of mobile communication systems is spreading at a quickening pace. The users of these mobile communication system find merit in being able to place and receive calls whenever and wherever they desire. It has been remarkable where popularization of communication systems carried via radio waves over recent years. Effective utilization of the radio frequency resources is eager to be promised in narrowing spectrum occupancy bandwidth or saving transmission power in order to prevent radio resources from exhaustion. Such indispensable technologies as the Hilbert transformer, syllabic compander, RZ SSB, and phased array antenna are discussed to facilitate forecomming vehicular communication systems with super large traffic capacity.