O.4 Propagation Conditions
3GPP45.005GSM/EDGE Radio transmission and receptionTS
O.4.1 Static propagation conditions
The propagation for the static performance measurement is an Additive White Gaussian Noise (AWGN) environment. No fading and multi-paths exist for this propagation model.
O.4.2 Multi-path case
Doppler frequency difference between direct and reflected signal paths is applied to the carrier and code frequencies. The Carrier and Code Doppler frequencies of LOS and multi-path for GANSS signals are defined in table O.4-1.
Table O.4-1: Multipath Case
|
Initial Relative Delay |
Carrier Doppler frequency of tap [Hz] |
Code Doppler frequency of tap [Hz] |
Relative mean Power [dB] |
|
0 |
Fd |
Fd / N |
0 |
|
X |
Fd-0.1 |
(Fd-0.1) /N |
Y |
|
NOTE: Discrete Doppler frequency is used for each tap. |
|||
Where the X and Y depends on the GNSS signal type and is shown in Table O.4-2, and N is the ratio between the transmitted carrier frequency of the signals and the transmitted chip rate as shown in Table O.4-3 (where k in Table O.4-3 is the GLONASS frequency channel number).
Table O.4-2
|
System |
Signals |
X [m] |
Y [dB] |
|
Galileo |
E1 |
125 |
-4.5 |
|
E5a |
15 |
-6 |
|
|
E5b |
15 |
-6 |
|
|
GPS/Modernized GPS |
L1 C/A |
150 |
-6 |
|
L1C |
125 |
-4.5 |
|
|
L2C |
150 |
-6 |
|
|
L5 |
15 |
-6 |
|
|
GLONASS |
G1 |
275 |
-12.5 |
|
G2 |
275 |
-12.5 |
|
|
BDS |
B1I |
75 |
-4.5 |
Table O.4-3
|
System |
Signals |
N |
|
Galileo |
E1 |
1540 |
|
E5a |
115 |
|
|
E5b |
118 |
|
|
GPS/Modernized GPS |
L1 C/A |
1540 |
|
L1C |
1540 |
|
|
L2C |
1200 |
|
|
L5 |
115 |
|
|
GLONASS |
G1 |
3135.03 + k 1.10 |
|
G2 |
2438.36 + k 0.86 |
|
|
BDS |
B1I |
763 |
The initial carrier phase difference between taps shall be randomly selected between 0 and 2. The initial value shall have uniform random distribution.