N = i indicates that i FUEs are interfering at the receiver as in the situation where the FBS retrieves its FUE data with the MUE symbols feedback and the interference of the neighboring femtocells.
When the CDI at the BS is obtained through limited feedback, the received power and interference power can be approximated as γu,uZ and κu,vY, respectively [9].
In that case, if user's feedback follows the system's estimation and is assigned a high weight, it in fact becomes an outlier feedback and could bring large interference to future positioning queries.
Although the MU-MIMO will not work well with the large inter-user interference, the conventional feedback and user selection method cannot provide enough information to distinguish large inter-user interference and small inter-user interference.
In[16], the average loss in sum rate due to limited feedback and delay using inter-cell interference cancellation is derived and used for feedback bit allocation.
However, in practice, there are critical issues in CoMP, such as excessive feedback overhead [45], backhaul delay and burden [46, 47], and interference channel estimation [48].
In experiments 3 and 4, we explored the robustness of cortical feedback to interference with orthogonal engagement of attention, working memory, and visuospatial processing.
The advantages are that because the UE has the instantaneous knowledge on the downlink channel and interference conditions, it may deduce the best CoMP feedback for these conditions.
Thus, the greater ReHo in the PCC suggested that real feedback requires more suppression of internal interference than sham feedback, and, more importantly, our results indicated that the suppression was potentially associated with the local synchronization of the PCC in Slow-5 and Slow-4.
In particular, performing interference coordination on the users with high SIRs usually brings marginal gain but requires additional cost such as the feedback of interference channels.
