Transmission/Reception Device
AssigneeFujitsu Limited
InventorEtsuji NAKAGIRI
Life of this patent
Estimating the term…
Abstract
For transmission, a modulation method with a high bit rate is applied to subchannels with good transmission path characteristics, and a modulation method with a low bit rate is applied to subchannels with poor transmission path characteristics. In doing this, transmission path characteristic detection units 19 and 29 detect information on transmission path characteristics from received signals, and maximum bit-rate calculation units 20 and 30 use a minimization algorithm of a matroid convex function in order to determine a combination of values of transmission power for each of the subchannels that results in the maximum bit rate of the entire band. A combination of the determined transmission power and the modulation method (bit rate) is used for transmitting signals.
Claims5
A transmission and reception device that is for a communications system using a plurality of subcarriers and that is able to set transmission power and a modulation method for each of the subcarriers, comprising:
- a transmission path characteristic extraction unit to extract a transmission path characteristic from a received signal;
- a maximum bit-rate determination unit to determine a transmission power value and a transmission bit rate of each subcarrier by using a minimization algorithm of a discrete function for minimizing a matroid convex function expressing a relationship between a discrete transmission power value and a bit rate, on the basis of a transmission path characteristic so that a bit rate of an entire transmission is maximized;
- and
- a transmission unit to transmit a signal by using a modulation method corresponding to the determined transmission power value and the determined transmission bit rate.
Dependencies are inferred from the claim text.