Aspects of WINNER+ Spectrum Preferences - Celtic-Plus
Aspects of WINNER+ Spectrum Preferences - Celtic-Plus
Aspects of WINNER+ Spectrum Preferences - Celtic-Plus
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<strong>WINNER+</strong> D3.2<br />
Considering the entire network, it is<br />
reasonable to think that the average<br />
number <strong>of</strong> walls between the interfering<br />
HBS and the MS is about 2. For this<br />
reason the following parts <strong>of</strong> the study will<br />
focus on this spatial configuration.<br />
Figure 3-9 is an example <strong>of</strong> a dense<br />
internet box deployment in which each<br />
logo <strong>of</strong> France Telecom represents an<br />
internet box equipped with an HBS.<br />
Figure 3-9: Example <strong>of</strong> internet box deployment<br />
3.1.1.3 Interference between femtocells: Throughput results<br />
In this section we focus on the throughput performance for a 2x2 MIMO configuration with spatial<br />
multiplexing. We choose what is seen as the most realistic deployment scenario for LTE. The simulation<br />
has been done with the following parameters:<br />
• Downlink OFDM LTE, Carrier frequency 2.6 GHz,<br />
• Indoor A 3km/h channel (6 paths),<br />
• Channel bandwidth 10MHz<br />
• DTxAA MIMO scheme (spatial multiplexing, the highest MCS used is 64 QAM, code rate 5/6),<br />
• Maximum transmit power 15 dBm,<br />
• Without shadowing,<br />
• BER=0.01,<br />
• 1 user in the cell (using 10RB).<br />
The link curve has been generated by a system simulator calibrated for 3GPP studies in Orange labs for<br />
an Indoor A 3km/h channel (6 paths) and it has been validated by comparing the obtained throughput<br />
performance curves to simulations done by a NEC 3GPP contribution [3GPP2]. As the curve does not go<br />
under 0.5 dB, smaller values have been extrapolated.<br />
Figure 3-10 shows the maximum throughput that<br />
can be achieved when the total system bandwidth<br />
is used.<br />
60<br />
50<br />
Throughput per TTI<br />
40<br />
Mbps<br />
30<br />
20<br />
As expected, the greatest total throughput is<br />
achieved by the best location configuration (N other<br />
=2 N own =0), as the throughput is calculated from<br />
the SINR. Another important result to notice is<br />
that the slope <strong>of</strong> the curve increases as the<br />
number <strong>of</strong> walls increases. Indeed, when there is<br />
no wall between the user and his serving HBS,<br />
the throughput per TTI decreases from about 8.5<br />
Mbps between 16 meters and 26 meters.<br />
10<br />
0<br />
0 5 10 15 20 25 30<br />
Distance between the serving femto cell and the MS in meters<br />
Figure 3-10: Throughput performance for the whole<br />
bandwidth (50 RB/TTI)<br />
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