Patent ID: 6212407
Filing Date: 2001-04-03
Classification: H04B,H04W

Abstract:
A transmitter for being provided in a base station conducting communication with a mobile station of a high-speed communication user and a mobile station of a low-speed communication user according to a spread spectrum system, said transmitter comprising:a first antenna having a wide directivity;a second antenna having a directivity narrower than that of the first antenna;transmitting means for, when both said mobile station of said low-speed communication user and said mobile station of said high-speed communication user are located within an area to receive a signal from said second antenna, transmitting (i) a first transmission signal from the first and second antennas to the mobile station of the low-speed communication user and (ii) a second transmission signal, different from said first transmission signal, from the second antenna to the mobile station of the high-speed communication user.