18 GHz band base station, land mobile station, etc
18 GHz band land mobile station
18 GHz band base station, etc
18 GHz band fixed station for telecommunications service
18 GHz band fixed station for public service


Items

Technical standards
Tolerance of frequency ±50×10-6
Occupied bandwidth(fCL: clock frequency (MHz)) QPSK, etc fCL × (1 + α)
α: Roll-off rate (roll-off rate: 0.5 or less)
QFSK, etc fCL × 1.6 (modulation index : 0.4 rad)
fCL × 2.0 (modulation index : 0.7 rad)
16QAM, etc fCL × 1.3 (roll-off rate : 0.5 or less)
OFDM, etc fCL × (number of sub - carriers) × 1.1
Tolerance of spurious and unwanted emission intensity Unwanted emission : 50µW/MHz
Antenna power Designated 1W or less (0.5W or less for 18.6-18.8GHz)
Error +50%, -50%
Adjacent channel leakage power and out-band leakage power Refer to Attached Table 1.
Signal transmission rate 6Mbps or more
Limit of secondary radiated emissions Lower than 1GHz : 4 nW
1GHz or higher : 20 nW
Other devices > Automatic control function of antenna power ( For over 0.1W)
> Transmission antenna gain: Refer to Attached Table 2.
> Antenna gain to elongation from principal radiation direction of transmission antenna (Refer to Attached Table 3.)

Attached Table 1 : Out-band leakege power and adjacent channel leakage power

Items

Technical standards
Out-band leakage power (Attenuation from antenna power of carrier spectrum)

Attenuation (Asm) of antenna power per 1 MHz bandwidth at arbitrary frequency detuned by 50% to 250% of one channel bandwidth from the center frequency shall be the value calculated by the following expression or more.

Asm = a + b × (pd - 50) + 10 log (BWch) dBc
where
Asm: 59.8 + 10 log (BWch / 60) dBc in maximum for (a) below and 56dBc in maximum for (b)
pd: Ratio of one channel bandwidth to detuning frequency (%)
BWch : One channel bandwidth (MHz)

The (a) and (b) shall be as follows;
(a) When one channel bandwidth is 20MHz or less;
a = 11dBc, b = 0.3 when 100% > pd > 50%, and
a = 10dBc, b = 0.32 when 250% > pd > 100%
(b) When one channel bandwidth is over 20MHz;
a = 11dBc, b = 0.4
Adjacent channel leakage power (Attenuation from antenna power in the band of adjacent channel) In the bandwidth of "±0.45 × one channel bandwidth" at frequency detuned by one channel bandwidth from the center frequency:
27 + 8 log (BWch / 60) dBc
In the bandwidth of "±0.45 × one channel bandwidth" at frequency detuned by twice wider than one channel bandwidth from the center frequency : 43dBc

Attached Table 2 : Transmission antenna
Radio equipment Absolute gain of transmission antenna Directivity of transmission antenna
18GHz band base station, land mobile station, etc 20dBi or more Directional antenna
18GHz band land mobile station
18GHz band base station, etc 20dBi or less No specified
18GHz band fixed station for telecommunications service 20dBi or more

Directional antenna
18GHz band fixed station for public service

Attached Table 3: Gain to elongation from principal radiation direction of transmission antenna
(1)Aperture diameter of antenna: Less than 0.6 meter
Elongation from principal radiation direction (θ) Gain to elongation from principal radiation direction (dBi)
0°≤θ≤θq Ga max - 2.2×10-3[(f × D/0.3)×θ]2 or less
θq<θ≤θr 2 + 15 log(f × D/0.3) or less
θr<θ≤θs (when θs<θt) or
θr<θ≤θt (when θt≤θs)		 43 - 4 log(f × D/0.3) - 20 log(θ) or less
θs<θ≤θt (when θs<θt) 3 or less
θt<θ≤90° 3 - 0.0075(θ- (97.5 - Ga max))2 or less
90°<θ≤180° 10 - 10 log(f × D/0.3) or less
Ga max : 43.96 + 20 logD + 20 log(f/18) [dBi]
D : Aperture diameter [m]
f : Frequency [GHz]
θq : 21.2/(f × D/0.3) × √{Ga max -[2+15 × log(f × D/0.3)]} [°]
θr : 10[2.12 - log(f × D/0.3)] [°]
θs : 10[2.05 - 0.25 × log(f × D/0.3)] [°]
θt : 97.5 - Ga max [°]


(2)Aperture diameter of antenna: 0.6 meter or more
Elongation from principal radiation direction (θ) Gain to elongation from principal radiation direction (dBi)
0°≤θ≤θq Ga max - 2×10-3·[(f × D/0.3) ×θ]2 or less
θq<θ≤θr 2 + 15 log(f × D/0.3) or less
θr<θ≤θs 43 - 4 log(f × D/0.3) - (6.2 + 2Ga max/5) log(θ) or less
θs<θ≤θt 15.83 - Ga max/3 or less
θt<θ≤θu 15.83 - Ga max/3 - (0.0265 - 0.0005Ga max) × (θ-177.56 + 3.08Ga max)2 or less
θu<θ≤180° 10 - 10 log(f × D/0.3) or less
Ga max : 43.96 + 20 logD + 20 log(f/18) [dBi]
D : Aperture diameter [m]
f : Frequency [GHz]
θq : 22.5/(f × D/0.3) ×√{Ga max - [2 + 15 ×log(f × D/0.3)]}[°]
θr : 10[1.82 + Ga max/150 - log(f × D/0.3)] [°]
θs : 94.55 - 1.5Ga max [°]
θt : 177.56 - 3.08Ga max [°]
θu : 130.8 - Ga max [°]

Notice: Regulations in the Ordinance Regulating Radio Equipment shall have priority over the descriptions in the sheet when any difference is found between them. Further above descriptions do not cover all of the regulations.
Copyright 2006 TELECOM ENGINEERING CENTER.