Title:
VHF/UHF帯域におけるデータ配信のためのシステムおよび方法
Document Type and Number:
Japanese Patent JP5044722
Kind Code:
B2
Abstract:
Whitespace devices can use unused television frequencies for transmission and reception of WiFi OFDM signals. Three contiguous bands, such as former channels 2, 3, and 4, may be bonded together to define a whitespace band. In order to fit a WiFi OFDM signal into this whitespace band, a whitespace device compresses the bandwidth of each WiFi OFDM signal using a specific spectrum mask. Very low transmission power is needed for the modified WiFi OFDM signals, eliminating the need for high power amplifiers and most of the WiFi OFDM designs such as PHY and MAC can be reused with minor modifications.
Inventors:
C, Sikuan
Yee, Jun
Yee, Jun
Application Number:
JP2011529428A
Publication Date:
October 10, 2012
Filing Date:
October 02, 2009
Export Citation:
Assignee:
WI-LAN Inc.
International Classes:
H04H20/42; H04B1/04; H04W16/14; H04J11/00
Domestic Patent References:
| JP2009515468A |
Foreign References:
| US20090196180 |
Other References:
佐々木重信,[パネル討論]IEEE802.22における標準化動向,電子情報通信学会技術研究報告,2006年11月22日,第106巻,第395号,p.127-133
Carlos Cordeiro et al.,IEEE 802.22:An Introduction to the First Wireless Standard based on Cognitive Radios,Journal of Communications,2006年 4月,第1巻, 第1号,p.38-47,URL,http://www.ojs.academypublisher.com/index.php/jcm/article/download/01013847/86
Carlos Cordeiro et al.,IEEE 802.22:An Introduction to the First Wireless Standard based on Cognitive Radios,Journal of Communications,2006年 4月,第1巻, 第1号,p.38-47,URL,http://www.ojs.academypublisher.com/index.php/jcm/article/download/01013847/86
Attorney, Agent or Firm:
Ryoichi Takaoka
Nao Oda
Nao Oda