Title:
MIMOOFDM/OFDMAシステム中のコンテンションベースのアクセスチャネル設計方法
Document Type and Number:
Japanese Patent JP2012506177
Kind Code:
A
Abstract:
A contention-based multi-antenna access request transmission/receiving procedure in MIMO OFDM/OFDMA systems is provided to reduce access latency. A mobile station encodes and transmits an access request over a shared access channel using multiple transmitting antennas, while a base station receives and decodes a number of access requests using multiple receiving antennas. Each access request comprises an access indictor and an access message. In a first MIMO scheme, the mobile station transmits the access indicator as preambles, while the access message is encoded by SFBC/STBC to obtain spatial diversity. At the receive side, the access indicator is exploited as pilots for channel estimation. The access message is decoded using SFBC/STBC decoding algorithm. In a second MIMO scheme, the mobile station performs precoding/beamforming for each of the transmitting antenna to obtain beamforming gain, while the base station performs virtual beam matching based on the detection results of the access indicators.
Inventors:
Liao, Pay Kai
Lin, Tzuyuan
Chen, Yi Shen
Lin, Tzuyuan
Chen, Yi Shen
Application Number:
JP2011531340A
Publication Date:
March 08, 2012
Filing Date:
October 23, 2009
Export Citation:
Assignee:
MEDIATEK INC.
International Classes:
H04W74/08; H04J1/00; H04J11/00; H04J99/00; H04W16/28; H04W72/04
Foreign References:
| WO2008082908A1 | 2008-07-10 | |||
| WO2007133652A2 | 2007-11-22 |
Attorney, Agent or Firm:
Kenho Ikeda
Shuichi Fukuda
Shuichi Fukuda