The rotating element can receive its momentum for rotation by pre-rotation of the gas entering the rotating element, and/or by external drive through an electrical motor which is indirectly connected through a magnetic field.
The proposed adaptive constellation design with assumptions violated (pre-rotation off).
This assumption is valid for a practical system where the applicability of source phase pre-rotation is limited due to the unavailable ideal feedback channel or because of the undesirable delay induced by the feedback in the pre-rotation operation.
One hundred sixty-one (161), or 67.4%, completed the pre-rotation survey, and 96 (40.2%) completed the post-rotation survey.
In addition, we allow the source phase pre-rotation to be switched off in the HW measurements.
As one can see, the proposed framework significantly outperforms both reference three-step scenarios as well the corresponding theoretical limits even if the pre-rotation is off!
However, γ BC is not affected in this case, as the channel pre-rotation does not have any impact on the relay → destination performance.
The proposed adaptive constellation design from Section 7.2 based on the optimized tuple (r b,r s,N b,N s ) for each measured point (HW-pre-rotation on).
In addition to this, we analyze the system where source phase pre-rotation is switched off (or ineffective due to rapid channel dynamics), and thus the relay faces a multiple-access channel with a varying source channel phase offset.
The extension to general complex (L_{n}^{b},L_{nn}^{s}) can naturally embrace the source phase pre-rotation [23 25], which virtually reverts the fading channel to the conventional additive white Gaussian noise (AWGN) channel with ∢h ij =0.
Within this experiment, we evaluated the following situations on our USRP platform: The proposed adaptive constellation design from Section 7.2 based on the optimized tuple (r b,r s,N b,N s ) for each measured point (HW-pre-rotation on).
