C.2 Propagation Conditions

25.1713GPPFrequency Division Duplex (FDD)Release 17Requirements for support of Assisted Global Positioning System (A-GPS)TS

C.2.1 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.

C.2.2 Multi-path Case G1

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 GPS L1 signal are defined in table C.1.

Table C.1: Case G1

Initial relative Delay [GPS chip]	Carrier Doppler frequency of tap [Hz]	Code Doppler frequency of tap [Hz]	Relative mean Power [dB]
0	Fd	Fd / N	0
0.5	Fd – 0.1	(Fd-0.1) /N	-6
NOTE: Discrete Doppler frequency is used for each tap.

N = fGPSL1/fchip, where fGPSL1 is the nominal carrier frequency of the GPS L1 signal (1575.42 MHz) and fchip is the GPS L1 C/A code chip rate(1.023 Mchips/s).

The initial carrier phase difference between taps shall be randomly selected between [0, 2]. The initial value shall have uniform random distribution.

Annex D (normative):
Measurement sequence chart