
Interference and Coexistence 63
Indoor Emission mask
-" FCC (IndooO-'--Japan (indoor)
-50
E -70
-90~ ---~ ~ .......... i ............. !
t
t
.,oo i !
............ i .........
-120 .... i :.
, !
Frequency
(MHz)
i
.............................................. ..................
J
Figure 3.9 Proposed Japanese spectrum mask.
protect broadcast services and future cellular services, also known as fourth-genera-
tion (4G) services. In addition, transmissions in the 3.1-3.4 GHz band are not
allowed in order to protect radio astronomy services (RAS) operating at 3.3 GHz.
3.1.4 International Big Picture
Some