公开(公告)号：JP2000069570A

公开(公告)日：2000-03-03

申请号：JP16623699

申请日：1999-06-14

Applicant: MOTOROLA INC

Inventor： BOIXADERA ESPAX F ,  FARMINE YANN ,  WHINNETT NICHOLAS

IPC: H04B7/06 ,  H04B7/208 ,  H04L1/00 ,  H04L1/06 ,  H04Q7/38

Abstract: PROBLEM TO BE SOLVED: To provide the improvement method for a capacity in a duplicate scheme. SOLUTION: A duplicate scheme has a 1st frequency band and a 2nd frequency band. This method consists of steps (steps 402, 404, 410) that decide a capacity available for the 1st frequency band, a step where feedback data with a variable quantity corresponding to the capacity available on the 1st frequency band are transmitted and the feedback data consist of data to enhance the communication quality on the 2nd frequency band, and steps (steps 406, 408, 412, 414) where the transmission on the 2nd frequency band is optimized by using the feedback data when the data are available.

公开(公告)号：JP2000269869A

公开(公告)日：2000-09-29

申请号：JP2000055145

申请日：2000-03-01

Applicant: MOTOROLA INC

Inventor： BOIXADERA ESPAX F ,  FARMINE YANN ,  WHINNETT NICHOLAS

IPC: H01Q3/26 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04L1/06 ,  H04L27/26

Abstract: PROBLEM TO BE SOLVED: To obtain a communication system that uses an antenna array. SOLUTION: A 2nd communication unit generates an antenna weighting for the transmission path between two communication units 1, 2 and feeds it back to the 1st communication unit that has antenna arrays 4, 5, 6. This method is especially applicable to a multiple carrier system like an OFDM system. Only the weighting to a subcarrier that is identified as to have been received with comparatively poor signal quality is calculated, and the result is fed back to the 1st communication unit so as to minimize a request of additional expenses.