Title:
無線通信システム、無線通信装置及び無線通信方法
Document Type and Number:
Japanese Patent JP5153006
Kind Code:
B2
Abstract:
Reliability of beam selection by pre-coding is improved. A user terminal 52 selects an optimum beam (beam number 'b') in the next frame (t+1) based on the channel estimation value of a received pilot signal and transmits a difference value D (= b - a) between a beam number 'a' at the current transmission notified by a radio base station 51 and the selected beam number 'b' selected to be transmitted at the next transmission to the radio base station 51 as a feedback signal. The radio base station 51 previously stores the beam number 'a' notified at the previous transmission and combines the beam number based on the difference value D received as the received feedback signal and the previously notified beam number 'a' to restore the beam number 'b' desired by the user terminal 52. Pre-coding processing adapted to the beam number 'b' is performed and transmission to the user terminal 52 is executed in a state in which a beam of the appropriate beam number 'b' is formed.
Inventors:
Masayuki Hoshino
Katsuhiko Hiramatsu
Katsuhiko Hiramatsu
Application Number:
JP2009508899A
Publication Date:
February 27, 2013
Filing Date:
March 28, 2008
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H04J99/00; H04B7/04; H04B7/10; H04J11/00; H04W16/28
Domestic Patent References:
| JP2005509316A | 2005-04-07 | |||
| JP2006520109A | 2006-08-31 | |||
| JP2005509316A | 2005-04-07 | |||
| JP2006520109A | 2006-08-31 |
Foreign References:
| WO2006075453A1 | 2006-07-20 | |||
| WO2006104104A1 | 2006-10-05 | |||
| WO2006075453A1 | 2006-07-20 | |||
| WO2006104104A1 | 2006-10-05 |
Attorney, Agent or Firm:
Shohei Oguri
Toshimitsu Ichikawa
Kimihide Hashimoto
Toshimitsu Ichikawa
Kimihide Hashimoto