Furthermore, the CoMP method performs close to the ideal maximum ratio transmission even with the 3-bit feedback word.
In our study, feedback words include short-term CSI, which is assumed to be available at the transmitter without errors or latency.
For instance, a capacity increase by 4.37 b/s/Hz was noted at the 50%-ile when each cell in the CoMP set transmits with full power, and the LPN applies a feedback word of 3 bits for each cell in the CoMP set (except for the donor cell).
To reduce the bias to the maximum possible degree, all of the participants (N = 10) were newly recruited and naïve to the purpose of the experiment; moreover, we provided them visual feedback (words such as "Correct!") to inform whether or not their judgments were correct in each trial.
Based on the patients' feedback, the wording was refined on a question-by-question basis during a consensus meeting of the study team, which was composed of the authors and methodologists.
Techniques such as cognitive interviewing [ 31] can help illuminate issues with questionnaires and encourage a deeper, more systematic, piloting than sending a questionnaire out to a sample and obtaining general feedback regarding wording of items and layout.
Subsequently, the CAB provided feedback on wording and readability, question addition/deletion, assessed acceptability of questions and technology usability (see Technology section), and pilot tested questions before community-wide implementation.
The qualitative feedback and opinions on wording used to describe the constructs in the items are described in the Additional file 1.
We used the feedback to re-word confusing questions and to rank the questions by importance as perceived by the patients.
Feedback was positively worded and aimed at inducing an external focus, i.e. aiming at the movement effect to facilitate automaticity in motor control and promote movement efficiency (for detailed reviews, see [ 8, 38]).
