Patent ID: 6658024
Filing Date: 2003-12-02
Classification: H04J,H04L

Abstract:
A data transmission device which receives data including fast data of a first prespecified data rate and interleave data of a second prespecified data rate from an upper layer device and executes data transmission in environments where the noise level changes periodically by use of the dual bit-map method in which a larger amount of data are assigned to each frame that is transmitted in low noise periods and a smaller amount of data are assigned to each frame that is transmitted in periods including high noise periods, wherein:in the case (case â€œAâ€ ) where the amount of data which can be assigned to each frame that is transmitted in the high noise periods is larger than or equal to a specific amount which corresponds to the first prespecified data rate, fast data of the specific amount are assigned to each frame regardless of whether the frame is a frame that is transmitted in the low noise periods or a frame that is transmitted in periods including the high noise periods, and in the case (case â€œBâ€ ) where the amount of data which can be assigned to each frame that is transmitted in the high noise periods is smaller than the specific amount, only fast data are assigned to each frame that is transmitted in periods including the high noise periods, and fast data of an amount larger than the specific amount are assigned to each frame that is transmitted in the low noise periods.