A channel estimation and prediction unit 18 estimates a channel and predicts a channel for a next transmission slot. The winding carrier has a central cooling agent cavity with a lateral cavity leading out of the winding carrier connected thereto. In addition, the current mirror further includes a third transistor having a gate coupled to the other of the source and the drain of the first transistor for transferring the driving current signal. The first fuel and second fuel are not the same type of fuel. The multi-core ferrule has a convex end surface whose curvature radius R2 is at least 18.