公开(公告)号：AU2002347465A1

公开(公告)日：2003-06-30

申请号：AU2002347465

申请日：2002-11-21

Applicant: IBM

Inventor： BARRETO ANDRE NOLL

IPC: H04J11/00 ,  H04B1/707 ,  H04B7/06 ,  H04B7/26 ,  H04L27/26

Abstract: Methods, systems and apparatus for multi-carrier transmission of data. An example of a method includes the steps of: providing a stream of data, encoding the stream of data to create a plurality of complex values, assigning each of the plurality of complex values to one of a plurality of sub-channels which form one of two or more channels, assigning a separate value to each of the plurality of sub-channels, multiplying each of the plurality of sub-channels with the assigned separate value to generate a multiplied value for each of the plurality of sub-channels, modulating the multiplied value of each of the plurality of sub-channels to a sub-carrier to generate a modulated signal for each of the two or more channels, and simultaneously transmitting the modulated signal of each of the two or more channels.

公开(公告)号：AU2003244918A1

公开(公告)日：2004-01-19

申请号：AU2003244918

申请日：2003-06-17

Applicant: IBM

Inventor： JELITTO JENS ,  BARRETO ANDRE NOLL ,  TRUONG HONG LINH

IPC: H04L1/16 ,  H04L1/00 ,  H04L29/06 ,  H04L29/08

Abstract: The present invention discloses an apparatus and method for adapting a transmission parameter in a transmitting node of a data communication system to the current link quality of a data communication channel. The adapted transmission parameter is selected by the transmitting node from a set of transmission parameters in dependence on a number of successful transmissions. The number of successful transmissions is compared in the transmitting node against one of a first threshold value corresponding to a first state of the transmitting node and a second threshold value corresponding to a second state of the transmitting node. The method comprises in the transmitting node the steps of (a) counting the number of successful transmissions; (b) selecting the adapted transmission parameter (b1) in response to the number of successful transmissions equaling or exceeding the first threshold value when the transmitting node is in the first state, and (b2) in response to the number of successful transmissions equaling or exceeding the second threshold value when the transmitting node is in the second state; and in dependence of the result of a following transmission, operating the transmitting node in one of the first state and the second state.