Title:
コグニティブ無線に基づくOFDMA
Document Type and Number:
Japanese Patent JP5053365
Kind Code:
B2
Abstract:
A multiuser scheme allowing for a number of users, sets of user, or carriers to share one or more channels is provided. In the invention, the available channel bandwidth is subdivided into a number of equal-bandwidth subchannels according to standard OFDM practice. The transmitter is informed by an application that it needs to transmit data a particular rate. The transmitter determines the minimum number of subchannels and maximum energy (or noise) threshold for each subchannel necessary to achieve that data rate and selects a set of subchannels matching those requirements. The subchannels need not be contiguous in the spectrum or belong to the same channel. Once the transmitter has selected the required number of subchannels, it begins transmitting simultaneously on those subchannels across the entire bandwidth used by those subchannels.
Inventors:
Hassan, Amar A
Wittema, Christian
Wittema, Christian
Application Number:
JP2009507775A
Publication Date:
October 17, 2012
Filing Date:
April 25, 2007
Export Citation:
Assignee:
MICROSOFT CORPORATION
International Classes:
H04J11/00; H04J1/00
Domestic Patent References:
| JP2005244997A | ||||
| JP2005167502A | ||||
| JP2005260921A |
Foreign References:
| WO1996023371A1 | ||||
| WO2000074415A1 |
Attorney, Agent or Firm:
Shinjiro Ono
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Kenichi Torii
Kazuo Shamoto
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Kenichi Torii