A24.2 CHARACTERISTICS OF THE SYSTEMS
- Former user (Deleted)
A24.2.1 Victim link characteristics – FM
The victim FM system is assumed to have a 7.8 km cell radius which provides a 90% area availability. The reception bandwidth of the FM BS victim link receiver is equal to 8 kHz. Based on information provided in ERC Report 104 for FM system based on 12.5 kHz channel spacing, the following characteristics are used to describe the FM equipment:
Table 101: Parameters assumed for 12.5 kHz FM systems
Parameter | Mobile Station | Base Station |
Channel Spacing | 12.5 kHz | 12.5 kHz |
Transmit Power | 37 dBm | 44 dBm |
Receiver Bandwidth | 8 kHz | 8 kHz |
Antenna Height | 1.5 m | 30 m |
Antenna Gain | 0 dBi | 9 dBi |
Active Interferer Density Range | Variable | Variable |
Receiver Sensitivity | - 107 dBm | - 110 dBm |
Receiver Protection Criterion (C/I) | 21 dB | 21 dB |
Power Control Characteristic | Not used | Not used |
Note 1: This exercise assumes that the noise floor is small compared to the interfering signal (I).
Note 2: The Noise Floor can be obtained using the following equation (see ERC Report 68 [7]):
Noise Floor = Sensitivity – Receiver Protection Ratio
Table 102: Receiver blocking for 12.5 kHz FM systems
Frequency Offset | Base Station |
Any frequency | - 23 dBm |
A24.2.2 Interfering link characteristics – TETRA
The interfering TETRA system is assumed to have a 18 kHz emission bandwidth and a channel spacing which is equal to 25 kHz. The distribution in terms of frequency use over the 2 MHz band is taken as a uniform distribution, where each channel is being assigned the same probability. Based on information provided in ERC Report 104 for TETRA system based on 25 kHz channel spacing, the following characteristics are used to describe the TETRA equipments:
Table 103: Parameters used to model the TETRA systems
Parameter | Mobile Station | Base Station |
Channel Spacing | 25 kHz | 25 kHz |
Transmit Power | 30 dBm | 40 dBm |
Receiver Bandwidth | 18 kHz | 18 kHz |
Antenna Height | 1.5 m | 30 m |
Antenna Gain | 0 dBi | 11 dBi |
Active Interferer Density Range | Variable | Variable |
Receiver Sensitivity | - 103 dBm | - 106 dBm |
Receiver Protection Criterion (C/I) | 19 dB | 19 dB |
Power Control Characteristic | 5 dB steps to a maximum of 15 dB. Threshold = - 86 dBm | Not used |
Table 104: Unwanted emissions for TETRA systems (measurement bandwidth of 18 kHz)
(interefering link transmitter)
Frequency Offset | 30 dBm Mobile Station | Attenuation in dBc |
25 kHz | - 30 dBm | 60 |
50 kHz | - 36 dBm | 66 |
75 kHz | - 36 dBm | 66 |
100 - 250 kHz | - 45 dBm | 75 |
250 - 500 kHz | - 50 dBm | 80 |
> 500 kHz[1] | - 70 dBm | 100 |
[1] The level of unwanted emissions is supposed to be constant for frequency offset higher than 500kHz