MOBILE RADIO COMMUNICATION SYSTEM FOR DOWNLINK TRANSMISSION, AND SIGNAL TRANSMISSION METHOD VIA AT LEAST TWO DOWNLINK PATHS OF MULTIPLE-ANTENNA MOBILE RADIO COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a mobile radio communication system 1 for downlink transmission, and a method for transmitting a signal (s) via downlink paths 5, 6 in a multiple-antenna (3, 4) mobile radio communication system 1.;SOLUTION: The system 1 includes a base station 2 having a plurality of antennas 3, 4, a mobile user unit 8, the downlink paths 5, 6 having complex channel coefficients h₁, h₂, which pass through the antennas 3, 4 for transmitting the signal (s) from the base station 2 to the user unit 8, and a feedback path 9 for returning information related to a complex weight w, from the user unit 8 to the base station 2. The complex weight w is used for multiplication of the signal (s) transmitted via the downlink path 6. In order to improve the tolerance of the system 1 to a feedback transmission error 11 produced in the feedback path 9, the antennas 3, 4 in the base station 2 are disposed at a distance (a), so that the channels of the antennas mutually 3, 4 correlate.;COPYRIGHT: (C)2006,JPO&NCIPI