US 9,813,128 B2
Base station apparatus and transmission method
Hui Tong, Beijing (CN); Masayuki Hoshino, Kanagawa (JP); Ming Xu, Beijing (CN); Seigo Nakao, Singapore (SG); and Daichi Imamura, Beijing (CN)
Assigned to Sun Patent Trust, New York, NY (US)
Filed by Sun Patent Trust, New York, NY (US)
Filed on Feb. 7, 2017, as Appl. No. 15/426,939.
Application 15/426,939 is a continuation of application No. 14/615,359, filed on Feb. 5, 2015, granted, now 9,602,179.
Application 14/615,359 is a continuation of application No. 14/316,634, filed on Jun. 26, 2014, granted, now 8,995,557, issued on Mar. 31, 2015.
Application 14/316,634 is a continuation of application No. 13/634,210, granted, now 8,798,195, issued on Aug. 5, 2014, previously published as PCT/CN2011/071812, filed on Mar. 15, 2011.
Claims priority of application No. 2010 1 0125169 (CN), filed on Mar. 16, 2010; and application No. 2010 1 0164379 (CN), filed on May 6, 2010.
Prior Publication US 2017/0149482 A1, May 25, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/04 (2017.01); H04B 7/024 (2017.01); H04B 7/06 (2006.01); H04L 25/03 (2006.01)
CPC H04B 7/0478 (2013.01) [H04B 7/024 (2013.01); H04B 7/0634 (2013.01); H04B 7/0639 (2013.01); H04L 25/03904 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A communication apparatus using a multi-antenna array, the communication apparatus comprising: a codebook storage which, in operation, stores an extended codebook which is generated by combining a first basic codebook and a second basic codebook along a column direction, wherein the first basic codebook includes N groups, each consisting of four basic pre-coding column vectors (N is a natural number equal to or larger than 2), and wherein the second basic codebook is generated by applying phase offsets to the N groups, respectively, each of the phase offsets applied to the N groups being different from each other; a receiver which, in operation, receives, via the multi-antenna array, information including a pre-coding matrix indicator (PMI) that identifies one pre-coding extended column vector from among 4N pre-coding extended column vectors included in the extended codebook, from a terminal apparatus; and a transmitter which, in operation, pre-codes data using the pre-coding extended column vector identified by the PMI and transmits, via the multi-antenna array, the pre-coded data to the terminal apparatus.