Dominant interferer mitigation in closed femtocell deployment

Adaptive precoding for femtocell interference mitigation

“…We compare the performance of the MRS, HAPMI, and HRS schemes described earlier with two other competing schemes representing performance bounds. The first one, labeled "min interference", uses the PMI that minimizes the interference at the MUE, which does not consider the HUE throughput maximization (same as proposed in [7]). Hence, the performance of "min interference" constitutes an upper bound on the throughput of the MUE.…”

“…Among existing works in the literature, there are two related publications [7] and [8] on beamforming techniques in multiple antenna systems for interference control. The scheme proposed in [7] addresses the interference problem between two HeNBs: HeNB 1 and HeNB 2 .…”

“…The scheme proposed in [7] addresses the interference problem between two HeNBs: HeNB 1 and HeNB 2 . It assumes that the channel between HeNB 2 and its HUE is good enough so that HeNB 2 will choose the precoding matrix index that minimizes the mutual interference.…”

Combined transmit beamforming and channel-aware scheduling for interference mitigation in femtocells

“…To carry out this analysis, we first select a value of background noise power P N as reference, and then we define the mean received SNR values for the different links in dBs, using (14). After that, we start to adjust the power of the background noise in dB, keeping the rest of the parameters of the system constant (i.e., transmit powers and path http://jwcn.eurasipjournals.com/content/2012/1/293 loss attenuations).…”

“…In, e.g., [8,9], the authors http://jwcn.eurasipjournals.com/content/2012/1/293 proposed the use of dynamic frequency re-use, whereas in [10,11] power control was utilized for downlink and uplink cross-layer interference mitigation purposes, respectively. In addition, contributions of [12][13][14] explored the use of transmit beamforming (TBF) methods for interference mitigation that rely on explicit channel state information (CSI) reports in the reverse channel (i.e., for FDD air interfaces), while [15] analyzed the use of a busy burst protocol to coordinate the selection of TBF vectors at neighboring cells when channel reciprocity holds (i.e., for TDD air interfaces). In [16], a scheduling method was presented for reducing macro-femto interference, and in [17,18] beamforming and scheduling were combined for inter-femtocell interference mitigation purposes.…”