| 摘要 |
The present invention is related to a method for optimising a coded modulation scheme with a given spectral efficiency for communication over a fading channel represented/identified by B fading gains, whereby B is an integer number expressing the ratio between a code word duration and the duration over which the fading remains constant. The fading gains belong to a B-dimensional space of fading gains. The method comprises the steps of :
- selecting a coded modulation scheme having a coding rate, R c , and comprising a mapping with a modulation rate, R m , in accordance with the spectral efficiency,
- choosing a constellation in accordance with the modulation rate, R m ,
- labelling the constellation,
- selecting an error-correcting code type represented by a plurality of code parameters,
- determining the code parameters in accordance with the coding rate, R c , so that a code performance measure is optimized in the B-dimensional space of fading gains in one or more fading points corresponding to one or more fading points on a predetermined lower bound, at least one of said fading points having at least two different components, whereby at least one specific instance of error-correcting code of said code type is obtained. |
