Multiple-input multiple-output (MIMO) technology has also received a significant interest in the past decade for its significant increasement in data throughput and link range without additional bandwidth or increased transmit power.
In that approach the user utility increases with throughput but decreases with increased transmitted power.
The increased transmit power can be unwanted in some scenarios but if power consumption is not a crucial issue, higher data rates are achieved.
Multiple-input single-output (MISO) and multiple-input multiple-output (MIMO) use multiple transmit antenna arrays and offer significant increases in data throughput and link range without additional bandwidth or increased transmit power.
In particular, although plain signal-to-noise ratio (SNR) at the destination obviously increases when the IBO decreases, increased transmit power also strengthens the non-linear distortion leading to decreasing overall signal-to-interference-plus-noise ratio (SINR).
The transmission over multi-input multi-output (MIMO) channels offers significant increases in data throughput and link range without additional bandwidth or increased transmit power and results in higher capacity [1,2].
This is intuitively expected since, the larger the SNR operating point, the larger the power levels of the nodes, and therefore, the higher the accuracy level required by the self-interference cancelation techniques to remove the increased transmit power at nodes.
This is intuitively obvious since, the larger the distance between network nodes, the larger the power levels required to preserve the link SINRs, and therefore, the higher the accuracy level required by the self-interference cancelation techniques to remove the increased transmit power at nodes.
In case when inactive UE changes its status to active, the FAPs can automatically increase transmitting power to cover this newly active UE.
The approximate MSE in (14) for the proposed estimator decreases with increasing transmitting power q, increasing M or decreasing β iik, which means smaller interference level from other cells, i.e., smaller pilot contamination.
