Power efficient multi-carrier transmission with hard/soft decoding and controlled error rate

The error rate of a coded multi-carrier system can be controlled by adjusting the modulation parameters (signal constellation and level) per sub-carrier, while at the same time, minimizing the transmission power. We modify existing techniques to allow for efficient error rate control and to take the encoder/decoder into account. In particular, we study the soft decision receiver for which no adaptive allocation technique has been proposed to-date.