The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 2012
Filed:
May. 29, 2009
Kingo Miyoshi, Yokohama, JP;
Mikio Kuwahara, Yokohama, JP;
Kingo Miyoshi, Yokohama, JP;
Mikio Kuwahara, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a transmission apparatus in a MIMO-OFDM communication system employing cyclic diversity, a cyclic delay controller sets plural delay magnitudes, different for respective antennas, in cyclic delayers for each predetermined timing. The cyclic delayers receive symbols subjected to orthogonal frequency division multiplexing, for the respective ones of plural allotted antennas. Additionally, the cyclic delayers bestow cyclic delays on the individual symbols of the respective antennas in accordance with plural set delay magnitudes. The symbols cyclically delayed are outputted from the antennas. As the delay magnitudes, a first delay magnitude at a first transmission timing and a second delay magnitude at a second transmission timing are different for one antenna, and the delay magnitudes differ in the respective antennas for one transmission timing. Thus, in a MIMO-OFDM transmission scheme, frequency diversity and time diversity are enhanced to heighten a retransmission efficiency in a data retransmission mode.