WCDMA3G_CHModel
Description: 3GPP channel model for antenna array
Library: 3GPPFDD 10-99, Channel Model
Class: SDFWCDMA3G_CHModel
Parameters
Name |
Description |
Default |
Sym |
Type |
Range |
|---|---|---|---|---|---|
ChannelModel |
test environment (Delay, Power, and Doppler Spectrum of each path): Indoor A, Indoor B, Pedestrian A, Pedestrian B, Vehicular A, Vehicular B |
Vehicular B |
|
enum |
|
Carrier |
carrier frequency in GHz. |
2.0 |
fc |
real |
(0, ∞) |
ChipRate |
chip rate of system |
3840000 |
|
int |
[1, ∞) |
SampleRate |
samples per chip. |
4 |
|
int |
[1, ∞) |
Velocity |
mobile velocity in km/hour. |
100.0 |
V |
real |
(0, ∞) |
N |
2N + 1 is the number of sine wave that form a complex Gaussian process. |
100 |
|
int |
[1, ∞) |
AntennaNumber |
number of antennas |
1 |
|
int |
[1, ∞) |
AntennaSpace |
interval between two antenna elements in meters |
0.075 |
|
real |
(0, ∞) |
ArrivingAngle |
arriving angle in degrees for each path. |
75.0 45.0 15.0 -15.0 -45.0 -75.0 |
A |
real array |
(-∞, ∞) |
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
in |
input signal to channel. |
complex |
Pin Outputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
2 |
out |
output signal from channel. |
multiple complex |
Notes/Equations
- This model is used to simulate a multi-path fading channel based on tapped-delay line model [1]. Each firing, one token is consumed at the input, and one token is produced at the output. There is no path loss or gain in this model.
- The following figure shows the functional block diagram. In the diagram, tap delay, multi-path power distribution, and Doppler spectrum (used by Jakes model) is defined in [1].
Block Diagram of Channel Model based on Tapped-Delay Line
The following three tables describe the tapped-delay-line parameters. For each tap of the channels three parameters are given: the time delay relative to the first tap, the average power relative to the strongest tap, and the Doppler spectrum of each tap.
Jakes model uses N 0 low-frequency oscillators with frequencies equal to the Doppler shifts ωn=ωmcos(2π n/N) ( n =1,2, ... , N 0) plus one with frequency ωm to generate signals frequency-shifted from a carrier frequency 2π fc, where ωm=2π V/ l, l denotes wave-length of carrier and N 0=8, N=2×(2× N 0+1) is used in the component. The amplitudes of all the components are made equal to unity except for the one with frequency ωm, which is set equal to
, as illustrated in the following figure.
Antenna array is also considered in the channel model. Multi-path signal is summed and coupled to the output multi-port after phase shift using D and A.
Jakes Model
Indoor Office Test Environment Tapped-Delay-Line Parameters
Tap Channel A Channel B Doppler Spectrum Relative Delay (nSec) Average Power (dB) Relative Delay (nSec) Average Power (dB) 1 0 0 0 0 FLAT 2 50 -3.0 100 -3.6 FLAT 3 110 -10.0 200 -7.2 FLAT 4 170 -18.0 300 -10.8 FLAT 5 290 -26.0 500 -18.0 FLAT 6 310 -32.0 700 -25.2 FLAT
Outdoor to Indoor and Pedestrian Test Environment Tapped-Delay-Line Parameters
Tap Channel A Channel B Doppler Spectrum Relative Delay (nSec) Average Power (dB) Relative Delay (nSec) Average Power (dB) 1 0 0 0 0 CLASSIC 2 110 -9.7 200 -0.9 CLASSIC 3 190 -19.2 800 -4.9 CLASSIC 4 410 -22.8 1200 -8.0 CLASSIC 5 2300 -7.8 CLASSIC 6 3700 -23.9 CLASSIC
Vehicular Test Environment, High Antenna, Tapped-Delay-Line Parameters
Tap Channel A Channel B Doppler Spectrum Relative Delay (nSec) Average Power (dB) Relative Delay (nSec) Average Power (dB) 1 0 0 0 -2.5 CLASSIC 2 310 -1.0 300 0 CLASSIC 3 710 -9.0 8900 -12.8 CLASSIC 4 1090 -10.0 12900 -10.0 CLASSIC 5 1730 -15.0 17100 -25.2 CLASSIC 6 2510 -20.0 20000 -16.0 CLASSIC
References
- Draft New Recommendation ITU-R M.[FPLMT.REVAL], Guidelines for Evaluation of Radio Transmission Technologies for IMT-2000/FPLMTS (Question ITU-R 39/8).
- William C. Jakes, "Microwave Mobile Communications," IEEE Press, 1994.