Near Optimum Power Control and Precoding under Fairness Constraints in Network MIMO Systems

<table>Capacity (sum rate) maximization while the total power is kept constant (here 21.6 dBm = 145 mW). Without fairness (Case <svg height="10.9125" id="M261" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 8.2875004 10.9125" width="8.2875004" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,10.862)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g>
</svg>, left) this sum power budget allows to reach 2 bps/Hz/cell (the same circled values as in 2), while in Case <svg height="10.9125" id="M262" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 8.2875004 10.9125" width="8.2875004" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,10.862)"><path d="M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z" id="x32"></path></g>
</svg> (right), the overall sum rate is around 5% lower.</table>

International Journal of Digital Multimedia Broadcasting

fig4

Figure 4

Figure 4: Near Optimum Power Control and Precoding under Fairness Constraints in Network MIMO Systems 