Page 257 - GuideFWA

Similarly, the results show that both the IS-95 and IS-136 PCS will be unable to co-exist with the
DECT FWA applications unless the DECT FWA systems are serving in a very light traffic
density areas with a large separate distance to PCS receiver.

1

0.9 DECT to IS-95 BS
0.8
0.7 DECT to IS-136 BS
Prob{I < x}
0.6

0.5

0.4

0.3

0.2

0.1

0

11
15
20
25
30
35
40
45
50
55
60
65
70
75
80

Rise in Noise Floor, dB

Figure 17.4 Rise in PCS BS receiver Noise Floor

17.1.4 Conclusions

An analysis uses the statistic properties of the large scale FWA operations combining with Monte
Carlo simulations to study the adjacent channel interference from DECT FWA to PCS BS is
provided in this report.

Simulation results based on various system specifications such as different service areas and
maximum receivable distance are generated. In addition, the rise in receiver noise floor for IS-95
and IS-136 for a typical business area are also presented.

From the simulation results we conclude that the system performance of the FDD PCS is
expected to be greatly impaired by the neighboring DECT FWA while they are operating in the
adjacent frequency bands. A guard band or wide geographical separation may be needed.

To complete the study, future work on the interference analyses for PCS mobiles is also required.

17.2. AENS VIEW

Apart of the great amount of errors, inaccuracy and wrong assumptions made in the calculation
process included in report [20], which will be detailed later, the main point against this report is
that it includes a non-agreed methodology, not only related to the quantification calculation
method (Monte Carlo technique) but, mainly, because it includes neither agreed assumptions nor
a complete set of scenarios to make comparisons among them (it just analyses the scenario of
DECT as interferer and IS-95 and IS-136 base stations as victims).

Inter-American Telecommunication Commission 243