Patent ID: 6728294
Filing Date: 2004-04-27
Classification: H04B

Abstract:
A radio communication system including a base station and a plurality of terminal stations each communicating with the base station by radio in a frequency hopping spread spectrum, said base station having a radio communication apparatus comprising a receiving section for demodulating a signal obtained by multiplying an amplitude and a phase of each of receiving signals from a plurality of antenna elements with a weight value and synthesizing the signals, and a transmitting section for distributing the modulated signal into a plurality of signals, multiplying an amplitude and a phase of each of the divided signals by weight values, and radiating the signals from the respective antenna elements,said base station comprising: weight value storing means for storing the weight values of said receiving section and said transmitting section, that correspond to each of said terminal stations and each of hopping frequencies, before communication is carried out with each of the terminal stations; and directivity controlling means for first identifying a communication partner when a radio communication is carried out with each of the terminal stations, and for then reading the weight values of said transmitting section and said receiving section corresponding to said frequency and each of said terminal stations from said weight value storing means every time a carrier frequency is hopped, and controlling the directivity of said transmitting section and said receiving section.